Best 2-Bank Marine Battery Charger (2020 Reviews)

You are here because you have a marine vessel with two batteries that need charging. As a buyer, choosing a 2-bank battery charger can be frustrating, with so many are available. While it can seem like a complicated process, there’s no need to worry, we are here to make it easy. If you follow the information in this article, you should have your choice very fast.

To help you make an informed decision, I have developed this article in two parts. First, you can read in-depth reviews of eight of our favorite 2-bank battery chargers. Second, I include a buyer’s guide for how to choose a marine battery charger in five steps.

For ease of use there is a clickable table of contents to navigate to a specific product or section. Otherwise scroll down to learn which onboard battery charger is best for you.

We updated this article in January 2020 to ensure the smart chargers we recommend meet current standards. For this year two new models hit our best of list, both from the Promariner brand. Read on to discover the best 2-bank marine battery chargers for 2020. 

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Table of Contents

Comparison Chart

Preview
Editors Choice
Dual Pro 15 Amp/Bank Professional Series 2 Bank Charger
Minn Kota 1832300 Precision On-Board Charger, MK 230 PC (2 Bank x 15 Amps)
Top Marks
ProMariner 44012 ProSportHD Series Battery Charger - 12 Amp
Product Name
Dual Pro PS2
Minn Kota MK230PC
ProMariner 44012 ProSport 12HD
Verdict
Ultimate Performance & Repairable!
Premium, Popular & Reliable
Newest Version With Heavy Duty Distributed-On-Demand Charging
Amps Per Bank (Total Amps)
15 (30)
15 (30)
6+ Variable (12)
DC Voltage System
12/24
12/24V
12/24V
AC Input
115 VAC / 60 Hz
120 VAC / 60 Hz
120 VAC (+/- 10%) / 50-60 Hz
Battery Types
Wet Cell, AGM & Gel (custom order)
Wet Cell/AGM & High Performance (HP) AGM, & Gel
Wet Cell, AGM & Gel
Size (L x W x H) Inches
9.50 x 8.25 x 6.00
7.63 x 9.25 x 3.00
7.90 x 10.5 x 2.9
Weight – Pounds
14.5
10.5
6
Cable Lengths – Feet
3 AC & 5 DC
6 AC & 6 DC
6 AC & 6 DC
Warranty – Years
3
3
2
Editors Choice
Preview
Dual Pro 15 Amp/Bank Professional Series 2 Bank Charger
Product Name
Dual Pro PS2
Verdict
Ultimate Performance & Repairable!
Amps Per Bank (Total Amps)
15 (30)
DC Voltage System
12/24
AC Input
115 VAC / 60 Hz
Battery Types
Wet Cell, AGM & Gel (custom order)
Size (L x W x H) Inches
9.50 x 8.25 x 6.00
Weight – Pounds
14.5
Cable Lengths – Feet
3 AC & 5 DC
Warranty – Years
3
Preview
Minn Kota 1832300 Precision On-Board Charger, MK 230 PC (2 Bank x 15 Amps)
Product Name
Minn Kota MK230PC
Verdict
Premium, Popular & Reliable
Amps Per Bank (Total Amps)
15 (30)
DC Voltage System
12/24V
AC Input
120 VAC / 60 Hz
Battery Types
Wet Cell/AGM & High Performance (HP) AGM, & Gel
Size (L x W x H) Inches
7.63 x 9.25 x 3.00
Weight – Pounds
10.5
Cable Lengths – Feet
6 AC & 6 DC
Warranty – Years
3
Top Marks
Preview
ProMariner 44012 ProSportHD Series Battery Charger - 12 Amp
Product Name
ProMariner 44012 ProSport 12HD
Verdict
Newest Version With Heavy Duty Distributed-On-Demand Charging
Amps Per Bank (Total Amps)
6+ Variable (12)
DC Voltage System
12/24V
AC Input
120 VAC (+/- 10%) / 50-60 Hz
Battery Types
Wet Cell, AGM & Gel
Size (L x W x H) Inches
7.90 x 10.5 x 2.9
Weight – Pounds
6
Cable Lengths – Feet
6 AC & 6 DC
Warranty – Years
2

Preview
Top Marks
Dual Pro 10 Amp/Bank Sportsman Series 2 Bank Charger
Powermania Turbo M220V2 waterproof battery charger (Dual Bank, 20A)
Budget Friendly
NOCO Genius GEN2, 2-Bank, 20-Amp (10-Amp Per Bank) Fully-Automatic Smart Marine Charger, 12V Onboard Battery Charger And Battery Maintainer
Product Name
Dual Pro SS2
Powermania Turbo M220V2
NOCO Genius GEN2
Verdict
Charges Like A Champ!
Great For Group 34 Trolling Motor Batteries
Budget Friendly Waterproof Smart Charger
Amps Per Bank (Total Amps)
10 (20)
10 (20)
10 (20)
DC Voltage System
12/24V
12/24V
12V
AC Input
115 VAC / 60 Hz
120-240 VAC, 50/60 Hz
70-130 VAC, 50/60 Hz
Battery Types
Wet Cell & AGM (Gel – custom order)
AGM/Wet Cell, Gel, AGM+
Wet Cell/AGM, Gel, Calcium, & Enhanced Flooded Battery
Size (L x W x H) Inches
9.25 x 8.00 x 4.75
8.25 x 5.75 x 2.75
8.3 x 6.4 x 3.1
Weight – Pounds
10.88
7.7
8.7
Cable Lengths – Feet
3 AC & 5 DC
6 AC & 6 DC
6 AC & 6.3 DC
Warranty – Years
3
2
5
Top Marks
Preview
Dual Pro 10 Amp/Bank Sportsman Series 2 Bank Charger
Product Name
Dual Pro SS2
Verdict
Charges Like A Champ!
Amps Per Bank (Total Amps)
10 (20)
DC Voltage System
12/24V
AC Input
115 VAC / 60 Hz
Battery Types
Wet Cell & AGM (Gel – custom order)
Size (L x W x H) Inches
9.25 x 8.00 x 4.75
Weight – Pounds
10.88
Cable Lengths – Feet
3 AC & 5 DC
Warranty – Years
3
Preview
Powermania Turbo M220V2 waterproof battery charger (Dual Bank, 20A)
Product Name
Powermania Turbo M220V2
Verdict
Great For Group 34 Trolling Motor Batteries
Amps Per Bank (Total Amps)
10 (20)
DC Voltage System
12/24V
AC Input
120-240 VAC, 50/60 Hz
Battery Types
AGM/Wet Cell, Gel, AGM+
Size (L x W x H) Inches
8.25 x 5.75 x 2.75
Weight – Pounds
7.7
Cable Lengths – Feet
6 AC & 6 DC
Warranty – Years
2
Budget Friendly
Preview
NOCO Genius GEN2, 2-Bank, 20-Amp (10-Amp Per Bank) Fully-Automatic Smart Marine Charger, 12V Onboard Battery Charger And Battery Maintainer
Product Name
NOCO Genius GEN2
Verdict
Budget Friendly Waterproof Smart Charger
Amps Per Bank (Total Amps)
10 (20)
DC Voltage System
12V
AC Input
70-130 VAC, 50/60 Hz
Battery Types
Wet Cell/AGM, Gel, Calcium, & Enhanced Flooded Battery
Size (L x W x H) Inches
8.3 x 6.4 x 3.1
Weight – Pounds
8.7
Cable Lengths – Feet
6 AC & 6.3 DC
Warranty – Years
5

Preview
Budget Friendly
ProMariner 43012 ProSport 12 12 Amp, 12/24 Volt, 2 Bank Generation 3 Battery Charger
ProMariner ProNautic 1210P 10 Amp 2 Bank Battery Charger
Product Name
ProMariner 43012 ProSport 12
ProMariner ProNautic 1210P
Verdict
Compact Unit, Distributed-On-Demand Charging
Super Lightweight & 12 Charge Stages!
Amps Per Bank (Total Amps)
6+ Variable (12)
Variable (10)
DC System Voltage
12/24V
12 V
AC Input
120 VAC / 60 Hz
100-240 VAC / 50-60 Hz
Battery Types
Wet Cell/AGM & High Performance (HP) AGM, Gel (special order)
Wet Cell, AGM, GEL, LifePO4/Lithium and Custom Calcium
Size (L x W x H) Inches
9.88 x 7.25 x 2.75
10.25 x 8.5 x 3.5
Weight – Pounds
4
5
Cable Lengths – Feet
6 AC & 6 DC
6 AC & 6 DC
Warranty – Years
2
5
Budget Friendly
Preview
ProMariner 43012 ProSport 12 12 Amp, 12/24 Volt, 2 Bank Generation 3 Battery Charger
Product Name
ProMariner 43012 ProSport 12
Verdict
Compact Unit, Distributed-On-Demand Charging
Amps Per Bank (Total Amps)
6+ Variable (12)
DC System Voltage
12/24V
AC Input
120 VAC / 60 Hz
Battery Types
Wet Cell/AGM & High Performance (HP) AGM, Gel (special order)
Size (L x W x H) Inches
9.88 x 7.25 x 2.75
Weight – Pounds
4
Cable Lengths – Feet
6 AC & 6 DC
Warranty – Years
2
Preview
ProMariner ProNautic 1210P 10 Amp 2 Bank Battery Charger
Product Name
ProMariner ProNautic 1210P
Verdict
Super Lightweight & 12 Charge Stages!
Amps Per Bank (Total Amps)
Variable (10)
DC System Voltage
12 V
AC Input
100-240 VAC / 50-60 Hz
Battery Types
Wet Cell, AGM, GEL, LifePO4/Lithium and Custom Calcium
Size (L x W x H) Inches
10.25 x 8.5 x 3.5
Weight – Pounds
5
Cable Lengths – Feet
6 AC & 6 DC
Warranty – Years
5

Best Overall 2-Bank Marine Battery Charger

Purple label with gold anchor stating Editor's choice
Sale
DualPro Professional Series 2
  • Battery Chemistry Types: Wet Cell, AGM, and Gel Cell (special order only)
  • Voltage: 12/24 Volts DC
  • AC Input Voltage: 115 VAC / 60Hz
  • Amps Per Bank: 15 A
  • Total Amperage: 30 A
  • Charging Stages: 4
  • Dimensions (inch): (L)9.50 x (W)8.25 x (H)6
  • Weight (lbs): 14.5
  • Water Proof Design Standard: IP68
  • Warranty (years): 3
What We Like
  • Repairable!
  • Water Proof - Highest Rating Available
  • DeltaVolt Intuitive Charging Technology
  • Easy to Install & Use
  • Impressive Built-in Safety
  • Reliable, and Fast Charging
  • Great Warranty: 3 Years
What We Do Not Like
  • Short Cords
  • Heavier Than Most

Dual Pro PS2 Review:

For 2020 the Dual Pro “Professional Series 2” repeats as my pick for best 2-bank onboard charger. Unchanged from last year, Dual Pro continues to be the gold standard within the smart charger industry.

I love that it’s made in the USA, plus it’s the first choice of over 50 boat manufacturers and pro bass fishing boats. The professional series 2 (PS2) is a top of the line, 15 amps per bank charger.

Approved for Wet cell or AGM batteries and can be special ordered for Gel cell batteries too. The PS2 is ideal for group 31 and larger trolling motor batteries. In fact, you can use it on land and in fresh or saltwater. Being this versatile it makes sense for hobbyists and pro’s to trust Dual Pro.

Next let’s discuss features. Worried about waterproof capability? Fear not, this 2-bank battery charger has an the highest rating possible: an IP 68 rating. This means the charger is submersible and hermetically sealed. For safety Dual Pro includes short circuit, reverse polarity protection and temperature compensation. I appreciate the simple LED charge mode indicators and onboard diagnostic coding. For installation, it’s easy and flexible.

What separates Dual Pro from the rest: it’s a “green” battery, meaning it is repairable! Unlike other brands, which if damaged, you need to replace.

DeltaVolt Intuitive Charging Technology

Dual Pro employs their “DeltaVolt” smart charging system on all its battery chargers. This is an advanced microprocessor inside the changer. Which provides a five stage controlled and intuitive charge technique.

Automatic charging can adapt to the needs for both cranking and deep cycle batteries. While allowing for safe charging a mix of battery sizes. As a result, this charger is able to connect to many 12-V battery configurations in series and/or parallel. In either 12 or 24 volts outputs, the PS2 provides unmatched charging performance.

I like that it removes the guess work for charging to proper specific gravity levels as well. As a high quality charger it has a maintenance mode to keep your batteries at full charge during storage.

One issue that continues to plague the PS2 is the power cords are too short. Keep this in mind if you don’t have AC power close to your boat. Next is the weight, it weighs 14.5 pounds, for some small boaters this might be a deterrent. For small boaters concerned with weight but want a Dual Pro, read the Sportsman Series 2 review in this article.

Verdict:

Choose the Dual Pro PS2 if you want the absolute best in class smart charger. It is the ultimate smart charger for reliability, safety and American quality. Rest assured that you will own the most versatile choice due to it being the one brand that is repairable. For peace of mind, the Dual Pro comes with a three-year warranty.

Top Precision 2-Bank Marine Charger

Sale
Minn Kota Precision MK230PC
  • Battery Chemistry Types: Wet Cell/AGM & High Performance (HP) AGM, & Gel
  • Voltage: 12/24 Volts DC
  • AC Input Voltage: 120 VAC / 60 Hz
  • Amps Per Bank: 15 A
  • Total Amperage: 30 A
  • Charging Stages: 3 (plus 2 equalization modes, wet cell only)
  • Dimensions (inch): (L)7.63 x (W)9.25 x (H)3
  • Weight (lbs): 10.5
  • Water Proof Design Standard: IP67
  • Warranty (years): 3
What We Like
  • Extremely Fast Charging
  • Short Circuit, Reverse Polarity, Arc And Ignition Protected
  • Compensates For Ambient Temperatures
  • Low Line Voltage Doesn't Lower Charging Ability
What We Do Not Like
  • History Of Overheating
  • Pricey

Minn Kota MK230 PC Review:

A new pick for 2020 is the Minn Kota MK230 PC 2-bank charger. It replaces last years pick the MK220PC because is offers higher amps per bank. Higher amps per bank equates to shorter charge times, something all boaters like. If you aren’t familiar with Minn Kota, it is a powerhouse of a company founded in 1934, in Fargo, North Dakota. They make the hardest working trolling motors, shallow water anchors, and precision chargers. The company has a trusted following that continues to grow year after year.

Advantages of Minn Kota Precision Technology

Like others, this charger uses specific technology to deliver fast charging. The difference from other brands is how precise the Minn Kota microprocessors are. To explain what this means let’s look at four advantages of precision charging.

The first advantage is that each bank on the charger is independent and isolated from each other. Which means you can select and charge many battery chemistry types at the same time. Such as Wet cell, AGM/(HP) or Gel cell batteries. Like other chargers it can charge batteries in independent, series or parallel connections.

Second, is that it senses and compensates for outside temperature fluctuations. This is important because changing outside ambient temperatures can damage batteries while charging.

Third, is the automatic compensation for low line voltage problems. For example, overloaded outlets or extension cords can’t provide the full 120 volts. As a result, this 2-bank marine battery charger will sense and adjust to keep a consistent charge.

The fourth advantage pertains to wet cell batteries, this charger has a precise equalization mode. Which is a sudden burst charge to clean the lead plates of sulfation build up.

Other Great Features:

Out of the box the MK230PC is a decent weight of 10.5 pounds and install is simple. Boaters like the LED display that shows charge status and when you need to check the connection. Included is an AC plug holder to keep the charger plug dry, safe and accessible. It’s waterproof with shock and vibration resistant construction for rough water days. The single issue that I found for the Minn Kota 230PC is one overheating complaint. Although Minn Kota’s excellent customer service provided a quick solution.

Verdict:

Buy the Minn Kota MK230PC charger if you are looking for lightning quick charging. With precise charging profiles that control current and voltage without cooking your batteries. It’s the perfect match if you already own a trolling motor of the same brand. Rest assured as Minn Kota offers a 3 year warranty with revered customer service.

Top Lightweight Heavy-Duty Onboard Charger

top marks label in blue with yellow check mark
Sale
ProMariner 44012 ProSportHD 12
  • Battery Chemistry Types: Wet Cell, AGM & Gel
  • Voltage: 12/24 Volts DC
  • AC Input Voltage: 120 VAC (+/- 10%) / 50-60 Hz
  • Amps Per Bank: Variable
  • Total Amperage: 12 A
  • Charging Stages: 5
  • Dimensions (inch): (L)7.90 x (W)10.5 x (H)2.9
  • Weight (lbs): 6
  • Water Proof Design Standard: IP67
  • Warranty (years): 2
What We Like
  • Great Choice For Small/Medium Boats
  • New Heat Sink Exterior
  • Simple & Color Rich Display
  • 40% Lighter
  • Excellent Built-In Safety
What We Do Not Like
  • Nothing, So Far It Performs Great

ProMariner ProSportHD 12 Review

New for 2020 is the ProSportHD 12 Generation 4 marine charger. It takes 2nd place and top marks for the best onboard charges. Consider this as the new big brother to last years ProSport12. It is a 2-bank heavy-duty charger with variable 12-amp charging capacity.

This charger uses Distributed-On-Demand™ Technology which is an enhanced microprocessor and software control charge. Using 5 automatic charge stages:

  1. Analyzing
  2. Charging
  3. Conditioning
  4. Auto Maintain (Energy Saver)
  5. Equalization Mode (Once a Month Storage Recondition)

The final stage allows for safe short and long term storage.

Enhancements for 2020

First this charge has a new aggressive heavy-duty tri-surface heat sink design. This upper, lower and rear heat sink provides faster charging with better cooling. While delivering true rated constant current charging amps during charge mode.

Second, the ProSportHD 12 is up to 40% lighter than most epoxy filled chargers. This is a bonus for small and medium boat owners that need a heavy-duty solution.

Third, is the new dashboard on the exterior of the charger. Now you have simple colorful led lights and gauges. Such as LED completion status, dual mode battery status, real time system check and more.

Other bonuses include built-in safety features buyers come to expect from ProMariner. Including dual inline waterproof fuses, reverse polarity, over-temperature, over-current, over-voltage and ignition protection.

* Note: If you use 4D or 8D large capacity batteries don’t use ProSportHD chargers. For these applications, see ProMariner’s ProNauticP Series.

Verdict

If you want a lightweight charger designed for use in the harshest environments this is a top choice. Best for group 24-31 Wet cell, AGM and Gel Cell batteries. It’s easy to install, one that you can plug in and forget. For added confidence ProMariner offers a 2 year warranty on all their chargers.

Best Repairable Charger For Small Boats

top marks label in blue with yellow check mark
Dual Pro Sportsman Series 2
  • Battery Chemistry Types: Wet Cell & AGM (Gel – custom order)
  • Voltage: 12/24 Volts DC
  • AC Input Voltage: 115 VAC / 60 Hz
  • Amps Per Bank: 10 A
  • Total Amperage: 20 A
  • Charging Stages: 5
  • Dimensions (inch): (L)9.25 x (W)8 x (H)4.75
  • Weight (lbs): 10.88
  • Water Proof Design Standard: IP67
  • Warranty (years): 3
What We Like
  • Made In The USA
  • Repairable, Plus A 3 Year Warranty
  • Dependable 5 Stage Delta Volt Charging Technology
  • Temperature Compensated & Ignition Protected
  • Water Proof Rated IP67 & USCG Approved
What We Do Not Like
  • Short AC Power Cord

Dual Pro Sportsman Series 2 Review

Want a repairable charger but do not need 15 amps per bank? Do yourself a favor and consider the Dual Pro Sportsman (SS2). This is a 2-bank marine battery charger but it’s smaller, lighter and more affordable than the PS2.

At first look the SS2 is a 12/24 volt, 10 amp per bank, temperature compensating battery charger, made in the USA! The size is of the charger make it simple to install. It is a tough charger that boat manufactures and tournament fishermen trust.

Like the PS2, the SS2 is near waterproof except with a diminished waterproof rating of IP67. Although for real world applications this change is negligible. Where the SS2 shines is vibration resistance which is paramount for small boats. Plus the body features a powder coated aluminum base suitable for either fresh or salt water.

Delta Volt Advantages

Inside it uses the same 5 stage delta volt charging technology as the PS2. To explain, “delta volt” technology are separate microprocessors for each battery bank. This results in each bank’s microprocessor controlling its own charging algorithm. Using this tech allows for batteries of differing age, size, state of charge, or type to mix on this boat charger.

Which is great if your boat is using one starting battery and one trolling motor battery. Keep in mind though that this charger is best for deep cycle batteries up to 110 amp hours. For batteries over 100 AH save weight elsewhere and pick the Dual Pro PS2 15 amp per bank charger.

The best advantage of the DualPro SS2 is like it’s big brother it’s repairable. If something goes wrong the brand will fix it instead of you having to trash it.

One downside of the SS2 is a nuisance this brand is famous for, for some reason they use short power cords. Most companies provide 6 foot cords but Dual Pro gives 3 foot AC power cords and 5 foot DC cords. You will need to ensure power close to the boat which isn’t always available.

Verdict:

Buy the Dual Pro Sportsman Series 2 (SS2) if you want a capable USA made 2-bank marine battery charger. The SS2 is the perfect choice for small boaters. It’s a well priced capable charger from a trustworthy company and repairable. Plus they offer a 3 year warranty, what is not to love? The AC power cord that’s what.

Best 2-Bank Onboard Charger For Group 34 AGM Trolling Motor Batteries

Powermania Turbo M220V2
  • Battery Chemistry Types: AGM/Wet Cell, Gel, AGM+
  • Voltage: 12/24 Volts DC
  • AC Input Voltage: 120-240 VAC, 50/60 Hz
  • Amps Per Bank: 10 A
  • Total Amperage: 20 A
  • Charging Stages: 3
  • Dimensions (inch): (L)8.25 x (W)5.75 x (H)2.75
  • Weight (lbs): 6.8
  • Water Proof Design Standard: IP65
  • Warranty (years): 2
What We Like
  • Compact, Easy To Install And Use
  • Charges Depleted 0-volt Batteries
  • Allocates More Power To Weaker Bank
  • Epoxy-filled For Long-Term Waterproofing
  • Fan-cooled To Prevent Overheating
  • Full Charge Output At 90 VAC!
  • 100-240 VAC Full Range Input (Use It Worldwide)
What We Do Not Like
  • Short Warranty Period
  • Only Splash Proof

Powermania Turbo M220V2 Review

The Turbo M220V2 Charger is a compact, feature-packed, and epoxy-potted for waterproofing. Plus it has 3-stage automatic charging with a built-in battery type selector. Having a selector allows users to charge 12 volt Wet Cell, AGM, or Gel cell batteries to full capacity. As a result, this 2-bank marine battery charger is best for Group 34 battery systems up to 72 Ah capacity. For example users with an Optima Blue Top or the Odyssey Trolling Thunder will love this charger.

Powermania the company specializes in providing power solutions from recreational to industrial applications. In fact, they design, engineer, build and service their products in the USA. Plus, they ensure every unit meets the toughest quality inspections. Fishing boat builders, like Barker and Yellowfin trust Powermania for their new builds.

Active Cooling:

The exterior of this smart charger has a special feature that none of the other brands have. On the rear of the charger is an active cooling fan, which operates the entire time charging occurs. Consider this, all chargers can become hot over time, so they all need ventilation. Most chargers die because of long-term overheating.

Another advantage of having active cooling is to reduce installation issues. Most onboard chargers need at least six inches of space around them to allow for air flow. What if your boat doesn’t have that kind of space? For boats short on space the M220V2 with its active cooling fan becomes a serious advantage.

5 Features of the Powermania 2-Bank Marine Battery Charger:

The first feature of the MV220V2 is its ability to revive a 0-volt battery that has sat in storage. Other chargers don’t notice the presence of a battery if the voltage is less than certain level. Whereas the turbo M220V2 charger can save dead batteries. One exception though is if the battery has one or more shorted cells. In this instance the battery is not rechargeable no matter which charger you use.

Second is for boaters that enjoy international travel. The M220V2 accepts global AC input (120/240V AC). Depending on the locale you are in, it will sense the input voltage and make automatic adjustments.

Third, this charger can deliver full output if input AC voltage drops to 90V. For example:
Say you are at a small marina with 17 other boats that are all trying to charge. The lack of space close to shore power means you have hook up via a long extension cord. Due to the length of the cord there is a voltage drop to below 120V, say 99V. While competitors will drop output to 80%, some will stop charging. But with the M220V2 it will delivers full output no matter the voltage drop! This is great for efficient charging and prolonging battery life.

The fourth feature, is it uses “adaptive loading” to watch and send the most charge to the weakest battery. Buyers who research ProSport products will recognize this as “distributed-on-demand.”

Fifth, Powermania covers the entire circuitry in epoxy. They do this do help with vibration resistance and to be IP65 which means it is splash proof. Like the other chargers Powermania includes all the standard safety features. Including ignition, reverse polarity, short-circuit, over-current and over-voltage protection.

Possible Issues:

For downsides, I don’t like that you can’t mix battery types (Wet cell with Gel) during one charge. Although you can mix wet cell with AGM. Another issue I discovered is one internal fire issue for a larger model charger in 2018. But Powermania went above and beyond to fix the problem. On balance that is an example of impressive customer service.

Verdict:

Buy the Powermania turbo M220V2 if you have group 34 trolling motor batteries. Boaters with group 34 deep cycle marine batteries love this charger. Another reason to choose this charger is if you travel to international destinations. Unlike others, it will plug in to AC power worldwide. For peace of mind Powermania provides a 2 year warranty and great customer service.

Budget Friendly 2-Bank Boat Charger

green budget friendly label
Sale
NOCO Genius GEN2
  • Battery Chemistry Types: Wet Cell/AGM, Gel, Calcium, & Enhanced Flooded Battery
  • Voltage: 12 Volts DC
  • AC Input Voltage: 70-130 VAC, 50/60 Hz
  • Amps Per Bank: 10 A
  • Total Amperage: 20 A
  • Charging Stages: 8
  • Dimensions (inch): (L)8.3 x (W)6.4 x (H)3.1
  • Weight (lbs): 8.7
  • Water Proof Design Standard: IP68
  • Warranty (years): 5
What We Like
  • Great Price!
  • Pretty Fast Charging Times
  • Charges Deep-cycle and Starter Batteries up to 230Ah
  • 100% Sealed And Waterproof Rated: IP68 (highest possible)
  • Charges Multiple Battery Types
  • Long 5 year warranty
What We Do Not Like
  • Only One 12 Volt Battery Per Bank
  • Wakes Up/Test Battery Levels Only After 24 hours
  • Some Recent Quality Complaints
  • User Manual Could Be Better

NOCO Genius Gen2 Review

For a budget minded buyer the NOCO Gen2 2-bank waterproof charger is a good choice. NOCO as a company has been producing power products since 1914 in Cleveland, Ohio. So you can be confident in their ability to produce a high quality product.

The NOCO Gen2 has 100% sealed construction and rated at IP68, as a result it is a submersible on board charger. Which is great because you do not have to stress about this model operating in extreme environments. Another feature is its versatility for handling many battery chemistries. Including Wet, Gel, Calcium, and AGM batteries (from 25-230 Amp hours).

Since safety is crucial for battery chargers, it is good to see NOCO providing a lot of protection. Such as reverse polarity, short circuit, open circuit, sparks, overheating, over-current, and overcharge.

NOCO claims to  provide a special mode known as “Abnormality protection.” To clarify, this will automatically turn off the charger if it is in bulk charge mode for an extended period of time. Although I read some complaints that this mode has not functioned for many boaters. If this mode doesn’t function batteries can “boiled off” and die. For boaters using Wet cell batteries this is a factor to consider.

Another feature I find impressive about the NOCO Gen2 is the technology inside. NOCO includes one of the most advanced microprocessor systems for intuitive smart charging. This VosFX microprocessor, monitors input to diagnose, recover, charge, and maintain batteries. It completes this via an 8 stage charging process. The intended result is to give you the best battery performance and longevity.

8-Step Intelligent Charging Process

  • Steps 1 & 2: Diagnose &Analyze.
    This checks initial condition, voltage, state-of-charge and health. To determine the battery’s stability before actual charging starts.
  • Step 3: Recovery (if needed for Wet Cell Battery).
    Starts the recovery de-sulfation process for extreme discharged or sulfated batteries. To clarify these are short bursts or pulsating charges which clean the lead plates of sulfate buildup.
  • Step 4: Initialize.
    Slow and gentle start of the charging process.
  • Step 5: Bulk Charge.
    Increases the volume of current into the bulk charge stage. Building up to 80% of the battery’s capacity.
  • Step 6: Absorption Charge.
    This stage lowers the volume of the current to deliver a safe and efficient charge. During this charge it brings the battery up to a total of 90% battery capacity. By lowering current it limits off gassing and prolongs battery life.
  • Step 7: Optimization (float charge).
    Finishes the charging process and brings the battery to complete capacity. This stage is a trickle charge, which stabilizes the charge to optimize the specific gravity of a battery.
  • Step 8: Maintenance Charge.
    If the battery loses charge for some reason, this step initializes.
    Like the float stage, except it recharges the battery if voltage is below the right threshold. It recharges the battery until it reaches its optimal state. In effect the battery charger can stay on all the time without the overcharging risks.*

* Overcharging is a common issue that I found. For this reason the NOCO Gen2 is my choice for a decent inexpensive charger. Despite the impressive technology and safety features.

Verdict:

Buy the NOCO Gen2 20 amp 2-bank charger if you want a budget friendly, waterproof smart charger. One that is capable of charging two individual 12 volt marine batteries. But be aware of the overcharging issues with this smart charger.

Best Cheap 2-Bank Variable Marine Charger

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ProMariner 43012 ProSport 12
  • Battery Chemistry Types: Wet Cell/AGM & High Performance (HP) AGM, Gel (special order)
  • Voltage: 12/24 Volts DC
  • AC Input Voltage: 120 VAC / 60 Hz
  • Amps Per Bank: Variable - Distributed On Demand
  • Total Amperage: 12 A
  • Charging Stages: 4
  • Dimensions (inch): (L)9.88 x (W)7.25 x (H)2.75
  • Weight (lbs): 4
  • Water Proof Design Standard: IP67
  • Warranty (years): 2
What We Like
  • Great Variable On-Demand Charging
  • High-Quality Safety Features
  • Extreme Vibration Resistance
  • Waterproof
  • Simple Installation & Use
  • Good Warranty: 2 Years
What We Do Not Like
  • Higher Initial Cost
  • Longer In Size Than Others

ProMariner 43012 ProSport 12 Review

Want a cheap lightweight marine battery charger that doesn’t skimp on performance? The best choice for you is the ProMariner ProSport 12.

This is an onboard battery charger with two banks,  variable 12-amp charging capacity and up to 24-volt output. It’s versatile, since you can use it with many battery types. Including Wet cell/AGM, High Performance (HP) AGM, and Gel cell batteries.

As a smart charger, it uses digital microprocessors and includes “Distributed-On-Demand Charging.’ In addition, it has safety features like dual in-line DC safety fuses for trolling/house battery banks. As well as built-in over-voltage, overload, over-temperature, reverse polarity and ignition protection. Given this combination of technology and safety, you can rest easy using this charger on your boat.

100% Distributed-On-Demand Charging

This is the key feature for this charger and beloved by customers who choose the ProSport12. This is automatic multi-stage charging, for example if the starting battery has the least amount of charge left it will receive more amps. While the remaining charging amps go toward maintaining the trolling motor or house battery(s). As a result, this controlled pulse charging technology delivers cooler charger operation and fast efficient charging.

Additional Features:

The ProSport12 is a rugged 2-bank battery charger made of extruded aluminum, that’s waterproof and shock-proof. It is easy to install and operate.

I like the LED display for at-a-glance status of the different modes. Such as AC power, charging status, battery type, and energy saver/reconditioning modes. The latter are 2 special modes distinctive to this charger. Energy saver mode tracks and auto maintains batteries to ensure they keep a full charge. Which reduces AC power consumption, lowers operating costs and maximizes reserve power performance.

For more versatility the ProSport 12 has the special reconditioning mode. In short or long-term storage, this smart charger will check and top up all batteries on board a single time a month. Having this feature ensures you can be confident that your marine batteries will last long and have proper performance.

Bigger Than Other Chargers

After lengthy research, some concerns boaters have are the mixed feelings about total life expectancy of this charger. Other issues were common to most purchases, including cosmetics, size, or price. Regarding the size, this charger is a bit bigger in length than other chargers, so be aware if you own a small boat. On the other hand, the appearance or cost issue is up to you.

Verdict:

Buy the ProMariner ProSport 12 if you value a lightweight and simple to use smart charger. One that has impressive on-demand charging mixed with high quality built-in safety features. For added confidence ProMariner offers a two-year warranty.

Top Vented Battery Charger For 4D-8D Marine Batteries

ProMariner ProNautic 1210P
  • Battery Chemistry Types: Wet Cell, AGM, GEL, LifePO4/Lithium and Custom Calcium
  • Voltage: 12 Volts DC
  • AC Input Voltage: 100-260 VAC (Auto-Ranging) / 50-60 Hz
  • Amps Per Bank: Variable - Distributed On Demand
  • Total Amperage: 10 A
  • Charging Stages: 12 Selectable
  • Dimensions (inch): (L)10.25 x (W)8.5 x (H)3.5
  • Weight (lbs): 5
  • Water Proof Design Standard: Info Not Available
  • Warranty (years): 5
What We Like
  • Perfect For Use With 4D and 8D
  • Custom Charging Profiles
  • Excellent LED Display
  • Included Temperature Sensor
  • Lightweight Rugged Design
  • Auto Ranging AC Input For Global Applications
What We Do Not Like
  • May Need Occasional Monitoring
  • Past Overheating Issue

Review of the ProNautic 1210P

This 2-bank marine charger is for buyers who own cruisers, sailboats, yachts and commercial/large fishing boats. As I am sure you know, boats like these power setups are different. They use a common ground, set up for AC shore power and some times use an onboard generator/inverter. These set ups use larger batteries such as 4D or 8D mixed with group 24-31 batteries and an inverter to power the boat.

To speed up charging of these battery set ups knowledgeable boaters trust the ProNauticP Series of vented battery chargers.
If you use a 4D or 8D mixed with another group battery on your boat choose the ProMariner ProNautic 1210P as your 2-bank charger.

The ProNautic 1210P employs the ProMar digital performance charge platform. Which combines digital control and software-based power conversion technology with global energy management. In layman’s terms it means you have 12 digitally-controlled performance charge profiles. Combined with 4 main charge profiles including the following:

  1. Charge
  2. Condition
  3. Auto Maintain
  4. Recondition

In fact the ProNautic 1210P can charge batteries that are under load or not in use.

5 Exclusive Features Of The ProNauticP Series:

First, the 1210P has power factor correction with auto-ranging global AC input. Allowing it to operate off standard household power connections throughout the world.

Next the second feature, like all ProMariner chargers, uses distributed on demand charging. This will sense and distribute the available charging amps to the bank which needs it the most. While maintaining the other battery bank.

Third to help conserve energy, this charger has a special energy save mode. In this mode after 72 hours of not seeing a load greater than 5 amps, float voltage will lower. As a result it consumes less energy during storage periods. Lowering operating costs and maximizing reserve power.

Fourth, I love the simple to read LED indicators on this charger that show service and fault mode. Showing real time wiring faults or adverse conditions. Other indicators show charging voltage, amperage and AC power-on diagnostics.

Fifth is the automatic fan inside the charger to keep it cool during operation. The high quality fan the ProNauticP uses is quiet and efficient. Plus the innovative front exhaust prevents restriction of air flow and cooling.

An added bonus to the ProNautic 1210P is the included remote temperature probe. It’s simple to use as it is plug and play. Connecting it will make the charger adjust its charge based on battery temperature.

Old Issues Addressed

I don’t have 4D or 8D batteries, any issues noted in this article I found via online forums. In 2017 customers noted overheating issues for older models. Although if users follow the manual to set up the custom charge profile the issue fixes itself. Other than this, I didn’t find any more issues.

Verdict:

If you own a boat that uses large capacity batteries like 4D or 8D pick this charger. You get an awesome smart charger that plugs in around the globe. With the ability for deliver efficient charge to batteries in use or during storage.

How To Choose A Boat Battery Charger:

Before you attempt to buy a battery charger it is important to follow these 5 steps. By completing these steps you will ensure that you avoid buying the wrong charger for your needs. Alright, let’s get started.

Step 1: Identify What Battery Type You Use

Most boaters use 3 chemical types of marine batteries: Wet cell, Gel, and AGM batteries.

Wet Cell battery: Needs Maintenance & Considered Hazardous Material

A wet cell or flooded lead-acid battery, is the traditional choice for hand-on boaters. This is due to the simple lead-acid internal construction which you need to maintain. The lead-acid system inside the battery comes in two parts, first are some lead plates and second is the acid solution. To create power, the acid comes in contact with the lead plates creating a chemical reaction.

To further explain, lets look at the interior construction of this type of battery. The acid is an electrolyte fluid, water (distilled)makes up one half, which needs refilling and the other half is sulfuric acid. Since the water needs periodic refilling the cap is removable. Plus the chemical reaction creates hazardous off-gases. To be safe, the installation of this battery needs to be in a vented area of a boat. This traditional battery type is popular because it handles overcharging better than Gel Cell or AGM batteries. Likewise it is inexpensive and will not overheat as much as the other types. Keep in mind, you have to mount a wet cell battery vertical or it will leak through the unsealed top cap.

One thing to look out for with a wet cell is that it requires a battery charger with an “equalization mode.” An equalizing mode is a deliberate overcharge to the battery to remove sulfate crystals that build up on the lead plates over time. Sulfation build up lowers the capacity of the battery and can render the battery useless. Another factor to watch out for is hazardous hydrogen off gassing during the equalization mode. This off gassing is a fire hazard and promotes corrosion to chargers installed near the batteries.

Gel cell batteries: Maintenance Free

A Gel cell is the next technological advance of a lead-acid battery. Where it differs from a wet cell is that it is a sealed battery, as a result it is maintenance free and spill proof. Another difference from a wet cell is the interior construction. Inside it has a thickened electrolyte fluid from adding a gelled substance. In fact a Gel cell operates under pressure, forcing gases created during charging to remix into the water. For this reason it eliminates the need to refill water for the battery.

The downsides of these batteries are overcharging and over heating. As a result, many boaters have moved on to AGM batteries. For those boaters that do choose to charge a gel cell battery, you must use a charger with both voltage and temperature monitors.

Want to learn more about boat batteries?

Check out our comprehensive guide on:

Absorbed Glass Mat (AGM): Maintenance Free

An AGM Battery is a combination of the two previous types with one key difference. This difference is a lead plate separator made of woven glass fiber sheets. Adding this separator aids in providing more consistent power. To explain,  each glass sheet soaks in electrolyte which in turn absorbs and suspends the fluid. This results in the electrolyte fluid always being in contact with the battery plates. Constant contact with the plates enhances both the discharge and recharge efficiency. Likewise, the container comes sealed which is spill proof and vibration resistant.

Simliar to gel cell batteries, AGM batteries are sensitive to overcharging. To explain, overcharging boils off the acid, damaging the plates, and killing the battery.

In general, AGM and gel batteries need special smart chargers to prevent overcharging. Whereas a wet cell battery can use a digital charger. Either way, I prefer safe and fast charging for my marine batteries and recommend using smart chargers.

“Smart” chargers can charge a variety of battery types. While being safe and accurate using multi-stage charges, but more about that later. To ensure safety, check for a label that states it will work with the chemical type you use. Since every smart charger is different.

One last note, do not try to charge a gel cell at the same time as the other types on one charger. Gel cells need a lower voltage at the bulk and float stage. As a result, if you mix with the other battery types, one battery (the gel cell) may become damaged beyond repair.

Step 2: Determine the number of banks needed

Simply put, the number of banks needed, is the number of batteries the charger is able to charge at the same time. So if the charger has the “2 banks” label, it can charge 2 batteries within your boat at the same time. Although, if you have one 12V starter battery and two 12V trolling motor batteries you need a three bank charger. Whereas if you use one battery you can use a single bank charger.

To add confusion, there are instances when a “bank” is several batteries wired together. This is to allow these batteries to act as if they were a single, larger battery. With this in mind, smart chargers will allow one output per bank.

Each charger has outputs with separate positive and negative terminal connections. Plus per-bank microprocessors. To allow a charger to handle different types, sizes, and state of charges. Remember to be careful, what you can connect to a charger depends on the battery charger size.

Step 3: Determine Battery Charger Size – Amp Hours & Voltage

We don’t mean physical size of a charger but the actual capability of the charger. This refers to its amp and voltage rating. The amp rating will answer the amount of time the charger takes to charge batteries. While a voltage rating determines if the charger matches the wiring of your batteries.

For amps the simple answer is: the higher the amp rating, the faster the battery will recharge. To calculate what is a suitable amp rating you will do some simple math.

Amp hour rating on battery(s) X 10% = charger amp rating

Example (group 31 battery) 100 amp hours X 10% = 10 amp rating

To determine your total charge time, do another quick calculation.

Total Amp Hour Capacity of the Batteries

(divided by)

Total Amp Output of Charger

= Total Hours to Charge Batteries

Example: 100 amp hour battery / 10 amp rated charger = 10 hours

For voltage, it is critical to make sure that your output voltage matches the voltage on the charger.

Most small/medium sized boats use 12 volt batteries, some will use one battery but most use two or more. Most boaters will use two batteries to gain more amperage, but want the voltage to remain the same. To accomplish this they wire the batteries in parallel.

Two 12 volt batteries wired in parallel, will output 12 volts, so you need a 12 volt charger.

If you want increase the voltage but keep amps constant, you wire batteries in series. Two 12 volt batteries wired in series makes 24 volts, like when powering a trolling motor.

For two 12 volt batteries wired in series, they change to outputting 24 volts, now you will need a 24 volt charger.

Many boaters get confused, a 24 volt charger will not charge a 12 volt battery faster. Attempting this destroys the battery, the charger, and can cause a fire on your boat. To reduce this hazard 12/24, 36, and 48 volt specific chargers exist.

Step 4: Choosing A Power Source

You will either power your chargers with continuous or intermittent AC power. So you will have some things to consider which factor into what kind and the size of the charger you want.

Many boats spend most of their week at a dock, with a charger connected to shore power. If this is your situation you can buy smaller amp rated chargers that have constant 120 VAC power. Find one that can handle the DC system and deliver proper power to float-charge your batteries. A good rule is the following:

Have enough amperage to equal the sum of the DC loads plus 10% of the amp-hour rating of the batteries.

If you spend more time out on the water than on shore you need to factor in intermittent power. Keep in mind the amount of capacity you need until the next recharge. One helpful tool is a battery monitor, such as the Victron BMV-700 Battery Monitor. Some large boaters use an inverter generator to provide power to chargers on the water. But these may overcharge Gel and AGM batteries. So I recommend adding more battery capacity to be safe. Large battery banks accept more charging amps, so they replenish faster. As a result, you spend less time worrying and more time cruising the waters.

Step 5: General Considerations

The following list contains some general things to look out for, with a basic explanation of each.

  • Multi-stage Charging: A smart charger is “smart” because of how it charges and protects your batteries. To provide precision charging a smart charger will it take temperature and battery chemistry into account. It does this with built-in microprocessors that charge each battery in multiple stages. How many stages and which safety options are available will depend on the charger you choose. When using a smart charger the batteries will charge fast, be safe and will maintain them when not in use. While a smart charger is more expensive than a digital model it is worth the extra cost. Due to it aiding in extending the life of the battery.
    It does this with built-in microprocessors that charge each battery in multiple stages. How many stages and which safety options are available will depend on the charger you choose. When using a smart charger the batteries will charge fast, be safe and will maintain them when not in use. While a smart charger is more expensive than a digital model it is worth the extra cost. Due to it aiding in extending the life of the battery.
  • Vibration resistant: A high quality 2-bank battery charger should withstand shocks from wave impact.
  • Waterproof construction: It is critical that water cannot leak inside a charger. Water will destroy the microprocessor inside as well as produce shock and fire hazards. High quality manufacturers will build to a specific (IP) waterproof standard. The chart below explains each.

IP Waterproof Chart

General chart explaining IP waterproof ratings from IP00 to IP68
  • Mountable: If you choose an onboard 2-bank battery charger it should be easy to install. Some charger companies will include mounting hardware and others won’t. If they aren’t included, it’s important to find corrosion resistant hardware approved for use on your vessel. As well as following the manufacturer’s installation methods when mounting. Finding and installing with proper hardware will ensures a clean installation and reduce the risk of damage to the charger or your boat.

In Conclusion:

Choosing a 2-bank marine battery charger doesn’t have to be hard. Follow the five steps to choose a charger above, and buy based on what you have learned. In the end, thanks for letting Outdoors Informed help with your research, so you can spend more time out on the water.

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Last update on 2020-09-21

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