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NOCO Genius On-Board Battery Charger - AC to DC - 3-Bank - 12V - 30 Amp

NOCO Genius On-Board Battery Charger - AC to DC - 3-Bank - 12V - 30 Amp

Item # 329-GEN3
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329-GEN3 - Charges Only NOCO Battery Chargers
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Submersible, on-board battery charger draws power from a wall outlet to charge and maintain up to 3 batteries. Multi-stage charging algorithm charges batteries 2x faster than most marine chargers. Rugged, waterproof design for marine applications. Call 800-298-8924 to order NOCO battery chargers part number 329-GEN3 or order online at etrailer.com. Free expert support on all NOCO products. Guaranteed Lowest Price and Fastest Shipping for NOCO Genius On-Board Battery Charger - AC to DC - 3-Bank - 12V - 30 Amp. Battery Chargers reviews from real customers.
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  • Reviews (1)
  • Q & A (3)
  • Videos (1)
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NOCO Battery Chargers - 329-GEN3

  • NOCO
  • Battery Charger
  • Wall Outlet to Vehicle Battery
  • Boat
  • Trolling Motor
  • Generator
  • Electric Vehicle
  • Industrial Equipment
  • 12V
  • AC to DC
  • Charges Only
  • 230 Ah

Submersible, on-board battery charger draws power from a wall outlet to charge and maintain up to 3 batteries. Multi-stage charging algorithm charges batteries 2x faster than most marine chargers. Rugged, waterproof design for marine applications.


  • On-board AC-to-DC battery charger draws power from a wall outlet to charge and maintain up to 3 batteries
    • Ideal for starter and deep-cycle batteries rated up to 230 amp-hours
    • Perfect for boats, trolling motors, generators, electric vehicles, and industrial equipment
  • 3 Battery banks allow (3) 12-volt batteries to be charged simultaneously
    • Provides full charge output even with low or varying AC current input
  • Multi-stage charging algorithm charges batteries 2x faster than traditional chargers without overcharging
    • Analyzes battery condition and customizes charge to quickly and fully charge battery, providing a maintenance charge when needed
    • Built-in battery desulfator restores lost battery capacity
  • Firewall protects internal electronics against short circuits, open circuits, overheating, overcurrent, and reverse polarity
  • Over-molded connection points protect cables from damage and provide a water-resistant seal
  • Completely sealed and waterproof design is fully submersible - perfect for on-board marine applications
    • IP68 rated for protection against shock, vibration, water, dirt, and dust
    • Saltwater-tested to combat corrosion
  • Integrated eyelet connectors and Type-B AC power cord included
    • AC Port Plug (329-GCP1 - sold separately) makes it easier to access a charging port while maintaining a waterproof seal
  • Meets USCG-33 CFR 183.410 requirements


  • Application: 12V batteries
    • Battery types supported: wet cell, gel cell, AGM, enhanced flooded, and maintenance-free batteries
  • Charger dimensions: 11-3/8" long x 9-1/2" wide x 3-1/8" thick
  • HD eyelet cord length: 75-1/2"
  • AC cord length: 72"
  • Battery capacity range: 25 to 230 amp-hours
  • Input voltage: 70 - 130 VAC (50 - 60 Hz)
  • Number of battery banks: 3
  • Maximum charging amperage: 30 amps
    • 10 amps per battery bank
  • Output voltage: 12V DC
  • Weight: 15.1 lbs
  • Limited 5-year warranty

NOCO GEN3 On-Board Marine Battery Charger Diagram

Advanced Battery Charging Technology Reduces Charging Times

NOCO GEN3 On-board Battery Charger Charging Times Diagram

GEN3 NOCO Genius On-Board Marine Battery Charger - Submersible - AC to DC - 3-Bank - 30 Amp - 12V

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Video of NOCO Genius On-Board Battery Charger - AC to DC - 3-Bank - 12V - 30 Amp

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for NOCO Battery Chargers - Battery Charger - 329-GEN3 Review

Speaker 1: Today we're taking a look at the NOCO Genius onboard battery charger. The on board battery charger is designed for charging and maintaining three 12-volt marine, starter, or deep cycle batteries. It mounts directly to your boat, trolling motor, generator, electric vehicle, or industrial equipment. It has three banks on it so you can charge up to three batteries at the same time, and it's ideal for batteries up to 230 amp hours. It simply converts your AC power into safe DC power for battery charging. Charging amperage is 30 amps.

That's 10 amps per bank. It has a lot of built-in smart technology, so this unit's designed to monitor battery activity for safe, fast, and efficient charging of lead acid batteries such as wet, gel, AGM, EFB, and maintenance free batteries without the worry of overcharging. It begins charging when needed, and it also allows for continuous operation without supervision.It's also 100% sealed for a waterproof and fully submersible design, and it's saltwater tested to combat corrosion. Right here we have the charge LEDs. These LEDs allow you to visually see the charging status of each bank or of each battery.

They'll light up red when charging and then they'll turn to green when charging is complete. Also you have an exclamation point surrounded by yellow. That's gonna be the error notification, so you also have an error LED on each bank that notifies you when error conditions are present or when error conditions exist. The unit also features a built-in battery desulfator, which is designed to rejuvenate underperforming batteries. Simply what that does is it's a system that's built in here that allows the unit to recover deeply discharged or worn-out batteries.

This is a really nice unit.A few other features that it contains is that it features spark-proof technology as well as reverse polarity protection. When it comes to that waterproof design, it's an IP68 rated unit. It's also ignition protected, so this is a non-igniting and temperature controlled onboard battery charger that allows for safe and worry-free operation. So again, you'll notice it's a nice design, black in color, very solid unit. You have three banks, you have your wiring, black for negative, red for positive posts.

That has the lay flat connection points on it, and these are designed to fit over 3/8 inch diameter posts, and then each bank is protected with an in-line fuse, 15 amp fuse. It does come with insulation hardware, so if you wanna install it as the preformed holes right here in the casing, so that way you can easily get it mounted.Power cord, three-prong protector. There's the underside of the unit, nice flat design. Does have some feet on it, so it does keep it a little bit elevated. A few measurements I wanna go over with you real quick. I took a measurement of the unit from outer edge to outer edge going this direction, and when I did that I got a measurement of 11 1/2 inches long. I also took a measurement of the overall width, so just at the base, outer edge to outer edge, you got a measurement of 8 3/8 inches wide, and then from bottom to top in this orientation, that measured about 3 1/8 inches tall or deep. The mount holes on the unit, there's four of them, one on each corner. The corner ones are separated on center going this direction apart from one another by 6 7/8 inches, and then from this one to this one and this one to this one, so length-wise, they're separated on center by 9 5/8 inches.That's gonna do it for today's look at the NOCO Genius 3 onboard battery charger.

Customer Reviews

NOCO Genius On-Board Battery Charger - AC to DC - 3-Bank - 12V - 30 Amp - 329-GEN3

Average Customer Rating:  5.0 out of 5 stars   (1 Customer Reviews)

Submersible, on-board battery charger draws power from a wall outlet to charge and maintain up to 3 batteries. Multi-stage charging algorithm charges batteries 2x faster than most marine chargers. Rugged, waterproof design for marine applications.

- 329-GEN3

My previous charger died and took the entire battery bank with it. The Noco Genius was easy to install and plug in to a regular 110 socket so no splicing electrical hard wires. The cord was a little short so I mounted it on the genset sound shield then threaded the power cord through the top of the back bulkhead to the power source. Easy to see status lights, absolutely automatic sensing so it will not cook your batteries. I love it! 644346


Ask the Experts about this NOCO Battery Chargers

  • Is the 25-230 Ah Capacity of the NOCO Genius for Reverse or Cranking Amps
    The battery capacity range of the NOCO Genius On-Board Battery Charger part # 329-GEN3 is 25-230 Ah which refers to the reserve capacity, not the cranking amps. This is the highest three bank model we offer but there is one below this, the NOCO Genius Mini On-Board Battery Charger part # 329-GENM3 which has a battery reserve capacity range of 25-120 Ah.
    view full answer...
  • What Battery Amp Hour Rating is the NOCO Genius On-Board Battery Charger # 329-GEN3 Designed For
    The NOCO Genius On-Board Battery Charger # 329-GEN3 was intended for use on batteries that are up to 230 aH. If you were a bit higher than that with your battery this would still do a decent job charging it, but if you were significanly higher it would not work.
    view full answer...
  • Best Way To Charge Six 6 Volt Batteries
    In order to charge your battery bank I highly recommend using the NOCO Genius On-Board Battery Charger part # 329-GEN3. This charger will change all of your batteries at one time but you will need to hook up each bank to each of the three series. The issue you will run into with trying to charge all six batteries with one bank is that the charger would need to be rated very high in order to handle the amp hour capacity which we do not offer nor do I think you would like the price if you...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Installed by:
Cole B
Edited by:
Daron K
Written by:
Brian T

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