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NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp

NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp

Item # NOC84FR
Our Price: $424.95
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Battery Charger
Shipping Weight: 18 lbs
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Submersible, on-board smart charger draws power from a wall outlet to charge and maintain up to (4) 12V batteries at 10-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety. 1-800-940-8924 to order NOCO battery charger part number NOC84FR or order online at Free expert support on all NOCO products. Great prices and Fastest Shipping for NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp. Battery Charger reviews from real customers.
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NOCO Battery Charger - NOC84FR

  • Boat
  • Electric Vehicle
  • Generator
  • Trolling Motor
  • 12V
  • Battery Charger
  • NOCO
  • Wall outlet to Vehicle Battery
  • Charges/Maintains
  • 230 Ah

Submersible, on-board smart charger draws power from a wall outlet to charge and maintain up to (4) 12V batteries at 10-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety.


  • On-board AC-to-DC smart charger quickly charges and maintains up to 4 batteries
    • Perfect for boats, trolling motors, generators, electric vehicles, and industrial equipment
  • 4 Battery banks allow multiple 12V batteries to be charged simultaneously
    • Provides full charge output even with low or varying AC current input
  • Multiple battery profiles let you charge a variety of battery types
    • 12V Modes - normal, AGM, and lithium-ion,
    • Force mode - charge dead batteries below 1-volt
  • Multi-stage charging algorithm charges 2x faster than traditional chargers without overcharging
    • Analyzes battery condition to provide a customized charge
    • Built-in battery desulfator restores lost battery capacity
  • Heavy-duty 3/8" eyelet connectors provide maximum contact with terminals
    • Built-in 15-amp fuses protect electronics from dangerous overloads
  • Completely sealed, waterproof design is fully submersible - perfect for marine applications
    • Tested to resist saltwater corrosion
  • AC port plug (sold separately) creates a connection point for easy access to AC power


  • Application: 12V batteries up to 230 amp-hours
  • Battery types supported: wet cell, gel cell, AGM, enhanced flooded, maintenance-free, and Lithium-ion
    • Lithium-ion batteries must have bettery management systems (BMS)
  • Number of battery banks: 4
  • Maximum charging amperage: 40 amps
    • 10 amps per battery bank
  • Eyelet cable length: 72"
  • AC cable length: 72"
  • Working voltage: 120 - 240 VAC (50 - 60 Hz)
  • Maximum power consumption: 600 watts
    • 150 watts per battery bank
  • Low voltage detection rating: 1-volt
  • IP rating: 68
  • Dimensions: 11-7/16" long x 9-1/8" wide x 2-13/16" thick
  • Weight: 15.5 lbs
  • 3-Year limited warranty

NOCO GENPRO10X4 On-Board Marine Battery Charger Diagram

The rugged NOCO Genius GENPRO series on-board smart charger quickly charges and maintains your 12-volt lead-acid or lithium-ion batteries. Multiple battery bank efficiently charges deep cycle and starter batteries up to 230 amp-hours. It's great for boats, trolling motors, generators, and a wide range of electric vehicles and industrial equipment. With a fully submersible design, this smart charger was built to handle harsh marine environments, while keeping your batteries in peak condition.

User-Friendly Interface with LED Indicators

NOCO Genius GENPRO10X4 LED Charging Indicators

This Genius smart charger was designed to provide a simple, user-friendly experience. The mode button allows you to easily cycle through the unit's charge settings. Back-lit LED indicators let you verify that the unit is operating correctly, and they allow it to be easily operated at night. These indicators signal the unit's charge status, selected charging mode, and alert you to potential performance issues or errors.

NOCO Genius GENPRO10X4 Advanced Battery Error Diagnostics

These indicators allow you to quickly identify a problem with the battery or connection. So you don't have to waste time guessing if the battery voltage is too high or too low for your selected mode, or worry about damage from a reversed polarity connection to a battery.

4 Battery Charging Modes for 12V Batteries

NOCO Genius GENPRO10X4 Battery Charger Charging Modes Explained

This Genius smart charger has 4 selectable charging modes that let you quickly switch between charging different lead-acid and lithium-ion battery types. Traditional battery chargers generally only work with a specific battery type, like lithium-ion or AGM batteries, or only in special circumstances like charging in cold environments. This NOCO charger gives you the versatility to tackle different battery types and charging situations in one charger.

The charger works with 12V wet cell, gel cell, enhanced flooded, calcium, maintenance free, AGM, and lithium-ion batteries with battery management systems (BMS). A built-in battery desulfator restores lost capacity to sulfated and old batteries.

Heavy-Duty Eyelet Connectors

Sets of 3/8" eyelets connect the charger to your batteries. Over-molded connection points stand up to heavy usage and keep connections safe from the elements. Built-in 15-amp MINI fuses protect each connection against dangerous overcurrent.

Quickly Charge and Maintain Batteries from 120V to 240V AC Power Source

This Genius charger plugs into an available wall outlet to quickly charge and maintain multiple batteries. High-frequency switch-mode technology converts AC power into safe DC power to fully charge batteries. An onboard microcomputer monitors and controls this charging process to minimize power loss and maximize efficiency. Included hardware lets you mount the unit in an enclosed compartment, garage, or workspace.

NOCO GENPRO On-board Battery Charger Charging Times Diagram

The table above provides a quick reference for how long it will take the unit to charge batteries with various amp-hours.

Rugged Submersible Design

NOCO GENPRO10X4 Waterproof and Ignition Proof Design

This on-board charger was built to handle extreme marine conditions. The unit has an IP68 rating, which means it can handle being fully submerged in water, and it's protected against solid particles like dust or sand. Its ignition protected for safe and worry-free operation around marine engine compartments and fuel tank spaces. Saltwater won't cause issues either. The charger has been thoroughly tested to resist corrosion.

The housing is made from tough Lexan resin that protects the internal electronics against vibration and impacts. The unit can handle being dropped, kicked over, and just about anything else your day brings.

AC Port Plug for Plug-and-Play Charging

NOCO GEN Series GCP AC Port Accessory

Available AC port plugs (sold separately) from NOCO let you easily setup your GENPRO series charger for plug-and-play charging with any extension cord. The plug creates a "pass through" AC charging port on a surface, so you can quickly connect to the charger when it's mounted inside a compartment on a truck, boat, trailer or RV. This allows you to easily access the charger for charging engine block heaters, trolling motors, batteries, and other equipment. A snap-fit cap creates a watertight seal to protect the connection whenever you're done.

GENPRO10X4 NOCO GENPRO On-Board Marine Smart Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp

Installation Details NOC84FR Installation instructionsAlternate Instructions NOC84FR Installation instructions

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Customer Satisfaction Score:

Customer Reviews

NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp - NOC84FR

Average Customer Rating:  4.8 out of 5 stars   (35 Customer Reviews)

Submersible, on-board smart charger draws power from a wall outlet to charge and maintain up to (4) 12V batteries at 10-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety.


I received my noco 4 bank charger very quickly and is an amazing charger for my boat, etrailer had the best price around and they were very helpful in this purchase, only bad thing is I didn’t get the serial number to register the warranty before I mounted, thx etrailer.


This was my first order with etrailer. Price was competitive and delivery was quick. I installed the unit and everything seems to be in working order. I am hoping for years of trouble free service. I did have a few online questions and they were answered in a reasonable amount of time

Brett S.


Charger is just what was required for my 3 lithium and single AGM battery for my Ranger 620. Simple install and happy with the performance


I have not yet installed the product and my rating is based on numerous online reviews of the product. I can say that dealing with Etrailer was flawless and shipping was very prompt and packaging was excellent. Thank you again for a good experience.


I have been using this product on my pontoon boat charging 4 batteries for almost one year with no trouble. Great product.


I've only had it installed for a few weeks so far but it has worked like a charm so far. I have 1 lithium and 3 lead acid battery's and being able to charge them all at the same time is very convenient. Batteries have been ready to go for all day fishing every time I've been out


It appears to be a good charger. It is supposed to be compatible with the new lithium battery’s.


Delivery was on time and product looks to be in great condition. Can't wait to install and use!







Ordering,as usual,was effortless. The item was received on time and in good condition. I am extremely pleased to deal with the people at ETRAILER. This will be very helpful in keeping my boat batteries charged and ready to go.


this is the ultimate unit for onboard charger installation on dump trailers with dual batteries


Great charger for HD High cca AGM batteries.

these batteries in the most demanding conditions and is highly weather resistant.

Great service from e-trailer with product on the shelf competitively priced.


Great charger. Does everything that was advertised. Charges batteries in hours. Recomend to a friend.


Great company, fast shipping


Very pleased with this charger! Installed on my boat with 3 batteries, nice upgrade from my old charging system. Even nicer piece than I expected.


Great charger-maintainer for a group 31 AGM battery, I would caution it's use on smaller batteries, especially anything smaller than a group 24.

etrailer is a trusted vendor with great service, good pricing and product availability.


Only had the product for a couple of days but it seems to do exactly what is was intended to.


Good service, prompt shipping and no problems. Very satisfied.


heavy built charger, i would purchase again if I need another one.




Show More Reviews

See what our Experts say about this NOCO Battery Charger

  • Battery Charger Recommendation for 4 Battery Bank on RV
    The best charger solution would be the NOCO GENPRO part # NOC84FR which was designed to charge a battery bank of up to 4 batteries like what you have. This is a 40 amp charger that can put a 10 amp charge per bank for each battery. It has charge/health indicators for each battery too so you'll know exactly how each battery is doing.
    view full answer...
  • Charging 4 Batteries But Only Using 3 With The NOCO GENPRO On-Board Battery Charger - 4 Bank
    Yes, this is something that you could do. The NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp, part # NOC84FR, will maintain up to 4 batteries. You can set your back up in parallel or series, charge all four batteries, then remove the cable from the fourth battery. You would add it back in when you need it. I have included a video demo below.
    view full answer...
  • What Gauge Wire Do I Need to Add 10 Feet of Wire to 2 Banks of the NOCO GENPRO # NOC84FR?
    Great question! I reached out to my tech at NOCO, and he confirmed that the 14AWG leads of the NOCO GENPRO On-Board Battery Charger - AC to DC # NOC84FR can be extended up to an additional 10' without modifying or moving the fuse. The fuse must remain in place and the additional length must be added after the fuse. It is important to note that any AC modifications will void the warranty and is strongly not recommended. The warranty will remain intact as long as these guidelines are followed....
    view full answer...
  • Can You Run Two Different Brands of Battery in Parallel
    In short, yes you can hook batteries from different brands in parallel. You would want to ensure that the batteries are of the same type though. You should not mix different types (deep cycle and starting), chemistry (wet cell /AGM/GEL...) or the capacity. You want to ensure they are not only both 12v deep cycle batteries but that they have the same Amp Hour rating. Ideally you would want batteries in similar age as well. To charge your batteries the NOCO GENPRO On-Board Battery Charger...
    view full answer...
  • Can Two Lithium Batteries and Two Wet Batteries Be Charged at the Same Time With the NOCO GENPRO
    Jimmy, yes I believe you are going to be able to charge two Lithium and two Wet batteries at the same time with the NOCO GENPRO On-Board Battery Charger # NOC84FR. This battery charger should have two separate channels that allows for this very thing to be done.
    view full answer...
  • Can NOCO GENPRO On-Board Battery Charger be Mounted in Any Position
    Yes, the NOCO GENPRO On-Board Battery Charger # NOC84FR can be mounted in any position. The only restrictions about mounting in the instructions has to do with keeping enough distance between the charger and battery bank.
    view full answer...
  • Can the NOCO GENPRO On-Board Battery Charger Charge The Batteries While They Are Powering Devices?
    Yes, you can have the NOCO GENPRO On-Board Battery Charger # NOC84FR connected and charging a battery while the battery is being used. The charger will continuously monitor the state of the battery and charge when needed. If fully charged it will maintain the battery. As this charger has 4 separate banks for charging different batteries you should be sure not to connect to any batteries that are wired together in series or parallel. As when the batteries are connected the charger it could...
    view full answer...
  • Recommended Chargers for 4 Battery and 2 Battery Banks on 2004 Discovery 39 Class A Diesel
    To charge the 4 battery bank on your 2004 Discovery 39 I recommend using the NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 4 Bank - 12V - 40 Amp # NOC84FR, which will charge batteries rated for up to 230 amp hours. You can also add the NOCO AC Port Plug with Extension Cord - 16" Long # 329-GCP1 to this setup to allow you to plug an extension directly into the coach since this setup will likely be stored in a cargo hold, out of the elements. For your engine batteries,...
    view full answer...
  • Can I Use My Batteries While Charging With The Bright Way Solar Battery Charger?
    The Bright Way Solar Battery Charger # BRW54FR has a one way diode to prevent it from draining your battery. The electricity will flow one way and one way only. As far as over charging goes, my co-worker had this charger on his enclosed trailer ALL WINTER LONG to charge his two 6V batteries and it did not overcharge them. I don't see there being any overcharging issues at all. Your batteries will be safe with this charger. I've used the NOCO Genius Smart Battery Charger # 329-GENIUS5 while...
    view full answer...
  • Can Two 6 Volt batteries Connected in Series be Charged at the Same Time
    Yes, you can charge multiple batteries simultaneously while wired together in series or parallel as long as your charger works at the final output voltage of your battery bank, and the charger is designed for the final output amp hours (Ah). For instance, if you have two # BRW74FR batteries rated for 6 volts and 220Ah, then you can connect them in parallel for a 2-battery bank that is 6 volts and 440Ah. Alternatively you could connect them in series for 2-battery bank that is 12 volts...
    view full answer...

Do you have a question about this Battery Charger?

Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Alex H
Updated by:
Alex H
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Michael B
Installed by:
Michael B

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