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NOCO Genius GEN3 30 Amp 3-Bank Waterproof Smart On-Board Battery Charger

by NOCO
4.4 out of 5 stars 604 customer reviews
| 211 answered questions
List Price: $269.99
Price: $239.95 Free Shipping for Prime Members | Fast, FREE Shipping with Amazon Prime
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Only 14 left in stock (more on the way).
Ships from and sold by Amazon.com.
3-Bank 30 Amp
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  • 30 Amperes (10 Amperes per bank) Smart On-Board Battery Charger for 12-volt batteries; charges and maintains all types of lead-acid batteries from 25-230Ah, including Wet, Gel, MF, and AGM
  • Designed for safety; safe for anyone to use; does not generate sparks, and protects against reverse battery hookup, short circuit, open circuit, overheat, overcurrent and does not overcharge the battery
  • 100 percent waterproof; completely sealed to protect against the most extreme environments and rated at IP68
  • Rapid Charging Technology; Charges batteries 2X faster than traditional battery chargers, and a lightweight, compact design
  • The most advanced charger ever; it features innovative and advanced technology that makes charging easy and simple; the charger makes important charging decisions so you don’t have to. It is the safest, most effective charger you may ever use
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$239.95 Free Shipping for Prime Members | Fast, FREE Shipping with Amazon Prime Only 14 left in stock (more on the way). Ships from and sold by Amazon.com.

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  • NOCO Genius GEN3 30 Amp 3-Bank Waterproof Smart On-Board Battery Charger
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This item NOCO Genius GEN3 30 Amp 3-Bank Waterproof Smart On-Board Battery Charger
Customer Rating 4 out of 5 stars (604) 3 out of 5 stars (27) 4 out of 5 stars (19) 4 out of 5 stars (2565)
Price $239.95 $159.99 $273.03 $97.98
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Amazon.com Amazon.com Amazon.com Amazon.com
Item Dimensions — 6.18 x 9.29 x 2.95 in 8 x 11.25 x 4.75 in —
Item Weight 16.4 lbs 6.75 lbs 2 lbs 3.5 lbs
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Product Information

Style:3-Bank 30 Amp

Technical Details

Technical Specification

Warranty [pdf ]

Additional Information

Warranty & Support

Warranty, Parts:Parts
Product Warranty: For warranty information about this product, please click here. [PDF ]

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Product Description

Style:3-Bank 30 Amp

The on-board battery charger offers the perfect mix of high-technology and rugged construction. With a fully-sealed, waterproof housing, the GEN1 can be mounted directly onto a variety of applications including boats, tractors and a wide range of equipment. With the intelligent NOCO VosFX processor constantly monitoring the power input, attached battery and charger itself, the GEN1 charger is capable of diagnosing, recovering, charging and maintaining batteries. Automatically adjusts itself to changing current needs. Reverse polarity, short circuit, open circuit, spark proof, overheat, overcurrent and overcharge. High-frequency, high-efficiency for a lightweight, compact charger. Charges batteries 2 times faster than traditional linear battery chargers. 100 per cent full charge even with varying A/C input voltages. Safely charges Wet, Gel, MF and AGM batteries. Automatically shuts off if charger remains in bulk charge mode for an extended period of time. 100 per cent completely sealed. Protects our units from the most extreme environments and rated at IP68. Box includes a charger, owner's manual and user guide and product registration card. 3 Year Limited Warranty and meets ISO 8846 marine standards and ignition protected (US Coast Guard 33 CFR 183.410).

From the Manufacturer

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marine battery charger, onboard battery charger, onboard battery charger 1 bank marine battery charger, onboard battery charger, onboard battery charger 2 bank marine battery charger, onboard battery charger, onboard battery charger 1 bank marine battery charger, onboard battery charger, onboard battery charger 2 bank marine battery charger, onboard battery charger, onboard battery charger 3 bank marine battery charger, onboard battery charger, onboard battery charger 4 bank
Model GENM1 GENM2 GEN1 GEN2 GEN3 GEN4
Banks 1 2 1 2 3 4
Amps Per Bank 4A 4A 10A 10A 10A 10A
Voltage 12V 12V 12V 12V 12V 12V
Total Amp Output 4A 8A 10A 20A 30A 40A
IP68 Waterproof ✓ ✓ ✓ ✓ ✓ ✓
Customer Questions & Answers
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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsExcellent charger and I'm picky!!!!
By YooperInUtah on February 15, 2012
Style Name: 2-Bank 20 Amp Verified Purchase
I did a LOT of on line reviewing before purchasing my Genius 2 charger. I looked at many brand and narrowed it down to either Minn Kota or the NOCO Genius 2. I'm glad I went with the Gen2. I wired up the charger plug to a recessed outlet on my boat instead of the plug-in cord. The charger is small and light and give great power output for the money. 2 banks @ 10amps per bank. It automatically charges and then shuts off and goes into a "mainatain" mode. I charge both my starting batter and my deep cycle battery with it. It knows how to charge each batter based on the internal circuitry. I've used it about 1/2 a season (30 plus charges) and typically leave it plugged in for several days at a time. Batteries are perfectly charged and ready to go. I would HIGHLY recommend this charger to anyone who is looking for an onboard charging system for your boat. It beats the hell out of hooking up an individual battery charger after each trip. I just plug in an extension cord and I'm good to go. Amazon.com has the absolute BEST price on it too. I paid about $115 delivered and other sites are charging $179 or more! Its listed on the NOCO site for $215.
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5.0 out of 5 starsThe best charger on the market!!
By Tucknott on August 13, 2011
Style Name: 2-Bank 20 Amp Verified Purchase
Used to charge two Optima Blue Top deep cycle marine batteries and this charger is the best! Totally automated and very safe! Won't burn up or overcharge batteries. There's some serious technology in this charger!
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5.0 out of 5 starsNoco Gen2
By Danny McElroy on March 4, 2012
Style Name: 2-Bank 20 Amp Verified Purchase
Received item fast and was exactly as advertised. I read a lot of reviews which helped me with this purchase. I do agree with some of the reviews is that the power cord is a little short, but really no problem or issue for my application. IF you are looking for an on board charger, this is it. Price is best by far. Great product.
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5.0 out of 5 starsI love this charger!!!
By Hepotter on December 5, 2011
Style Name: 2-Bank 20 Amp Verified Purchase
It simply works and works great!

I have mine set up for two batteries, and that means the charger has four wires, a positive and negative for each battery, so my two battery system needed a "two bank" charger.

Multiple battery installations require one pair of wires from the charger to each individual battery. Generally you can get one to four "banks" on a charger. Each one charges a 12 volt battery at ten amps.

It is well sealed with epoxy, weather proof, temperature proof, and has two green leds, quite bright, that come on when the batteries are at 100% capacity. Two different leds show a red color while still charging, so it's hard to get mixed up.

This unit drops amperage in predetermined levels several times during the charge, ending at a trickle charges after the batteries are fully charged. This prevents overcharging, overheating, and lowering of battery fluid levels from heat, during the charging process. It also has the feature that cleans the plates in the batteries, which helps the battery life a lot and extends their peak performance. I don't know how it works...I don't care, as long as it keeps those expensive marine batteries alive and happy.

I wanted a battery charger smarter than I am, one I could plug and forget, even during rain, wind, heat of summer, to below freezing temperatures, and that's what I got. It has worked flawlessly.

You can find cheaper charges, but eventually that savings will be lost on more frequent battery change-outs, or worse, battery failure out on the lake. Just buy the best, and forget about having to worry whether it's doing its job correctly, and having to run out and undo the leads when the battery is full, to avoid overcharging.Read more ›
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5.0 out of 5 starsSo far, the reviews dont lie!
By Lukethadrifter on February 13, 2012
Style Name: 3-Bank 30 Amp Verified Purchase
Recently purchased this to replace a 2 bank 5 amp charger. Does everything as advertised. Leave it plugged in and walk away. If you are looking to buy a 3 bank charger for your boat, dont pay 300 or even 400 bucks for the ones at bass pro shops or cabelas. This one does everything the higher priced models do for 145 bucks. Obviously, durability is not known yet but if it lasts 5-10 years, I will be happy. As for the knucklehead who gave this a one star rating because it dont charge "36 volt" batteries, only "12"...........are you kidding me?? three 12 volt batteries make 36 volts!!! It charges all three at the same time......wow........
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5.0 out of 5 starsNOCO Gen2 Genius On-Board Battery Charger
By Dave S. on August 31, 2011
Style Name: 2-Bank 20 Amp Verified Purchase
I installed this in a 25' boat. This is a well made, durable charger that was easy to install. The only dilemma was that the leads are a little short for what I needed to do. The installation instructions say to not alter the charger. I contacted the technical assistance folks and they indicated that extending the leads was okay. I did and everything works great. Great product, responsive technical assistance and an easy install.
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5.0 out of 5 starsNoco Gen2
By warfrat on November 7, 2011
Style Name: 2-Bank 20 Amp Verified Purchase
Excellent product. I have installed on my Jetcraft 1625SK with duel batteries, always fully charged, a must for all boats, Amazon as always was great, quick delivery,will always buy from amazon.
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5.0 out of 5 starsGreat charger
By Richard on January 30, 2012
Style Name: 4-Bank 40 Amp Verified Purchase
I installed the charger in my boat with minimal effort, simply mount the charger and hook up the wires. Charger brought my batteries to full charge in about 5 hours. Batteries seem to last longer after using this charger.
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Most Recent Customer Reviews

5.0 out of 5 starsFive Stars

I love it , good product

Published 1 day ago by Amazon Customer
5.0 out of 5 starsWaterproof and small enough for permanent install under hood.

I mounted this under the hood of my 2006 Jeep Wrangler Unlimited LJ as a permanent install. It's waterproof and small enough. I just keep the Jeep plugged in while in the garage. Read more

Published 3 days ago by Scott. M.
4.0 out of 5 starsExpensive for the juice

Nice unit though. I have had dozens of chargers in my life. Dont use this one to charge your generator battery from gen output receptacle, It will go nuts. Read more

Published 3 days ago by Charles J. Turner
5.0 out of 5 starsGood charger

Good onboard charger, easy to install, works as expected

Published 10 days ago by James R
5.0 out of 5 starsThis is THE ONLY charger that will keep multiple batteries well...

Bought this at the recommendation of the company that makes my batteries. Its a bit pricy; however, it is one of the highest AMP delivering chargees and it is one of the very few... Read more

Published 13 days ago by Keith Ritman
5.0 out of 5 starsWorks and looks good.

What can I say... It's a battery charger. It charged my battery. If it does all the other stuff it claims then great.

Published 14 days ago by Robert Wagoner
5.0 out of 5 starsGreat charger

Works great just had it installed will update

Published 17 days ago by Amazon Customer
5.0 out of 5 starsWorks great so far

Works great so far, have about 3 months use on it and so far so good. My other charger (different brand) only lasted 2 years so we'll see how this one holds up.

Published 17 days ago by Bublanski
5.0 out of 5 starsGreat Charger

Great charger my only complaint is that the charging lights on the front panel are difficult to view as they are extremely dim making them hard to see unless you get up real close.

Published 18 days ago by Fred V.
5.0 out of 5 starsAn excellent charging system

An excellent charging system. Glued 5/8" plywood to hull of the boat and then screwed charger to it. I recommend getting the pigtail adapter for permanent mount of the plug in.

Published 19 days ago by Al

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