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NOCO Genius 12v 24v 36v 48v 40 Amp On-Board 4 Bank Charger GEN4

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Automatically will diagnose, recover (if necessary), charge, and maintain your batteries in the most efficient manner possible. Now that’s smart, Wicked smart!

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Product InformationStore Part Number: GEN4


The NOCO Genius GEN4 charger is an 8 step, fully automatic 4 bank switch-mode battery charger, which automatically determines the condition of your batteries before beginning its charge cycle. It will only charge when the batteries need it, and will fully maintain your battery when it is in storage or between uses. All of the Genius line of battery chargers are programmed for optimal battery charging and maintenance, with proprietary Rapid Charging Technology(RCT). The smart microprocessor and advanced high frequency design will charge batteries twice as fast as a conventional transformer based marine charger, while always preventing overcharge. This assures you of maximum battery life and less down time. Genius chargers also utilitize Variable Input Compensation, which means that your charger will work as it should, delivering its full, correct voltage and amperage, whether or not long extension cords or low AC power are used. 


  • 90% Energy Efficient, providing the best charge while wasting less energy than other chargers
  • Fully Interactive, built-in Micro Control Unit for decreased charge times
  • Variable Input Compensated
  • Fully sealed waterproof design rated IP68 enclosure, yet factory serviceable
  • Compact Lightweight design allows for a smaller footprint than other chargers
  • Advanced 8 Step Design
  • 10 amp per output x 4 outputs, 40 amps max
  • Safe for AGM, Gel and Wet cell Lead Acid batteries
  • RECOVERY MODE: Recovers deeply discharged & sulfated batteries with pulse charging
  • Waterproof & Easy Install
  • Optimal 3 Step Charging
  • Spark Free Hook Up
  • Reverse Polarity Protection
  • Short Circuit Protection
  • Overload Protection
  • Line Regulation
  • Load Regulation
  • Thermal Protection
  • Output Regulation
  • 3 year Warranty


4 output Genius GEN4 chargers are waterproof, and fully automatic! Will charge up to 4 batteries independently.

Tech Specs

  • Dimensions (LxWxH): 11 x 7.3 x 2.9 in
  • Weight: 12.5 lb
  • Shipping Weight: 13 lb
  • DC Output Amps: 10
  • DC Output Voltage: 12v per output
  • Output Voltage Charging: 13.5 v-14.5 v DC
  • DC Output Voltage (No Load) approx.: 0 V when battery not detected
  • Absorption Voltage: 14.4
  • AC Input Amps: 3.0
  • Maximum AC Current @ 108 VAC: 1.5
  • Maximum AC Current @ 90 VAC: 1.5
  • AC Input Volts: 120 VAC
  • AC Input Volts Freq.: 50-60 Hz
  • AC Input Volts Range: 70-130 VAC
  • Max Inrush Current, Single Cycle: 6.0
  • Float Current: 1000 mA
  • Float Voltage: 13.5 typical 24 hour re-cycle
  • Model: GEN4
  • Manufacturer: NOCO
  • Typical Efficiency: 87%
  • Power Factor: 90%
  • Power Requirements: 330 w
  • Maximum Power Output, Continuous: 190 w
  • Maximum Power (+/- 3%) @ 25° C: 360 w
  • Maximum Output Amps Single Surge: 10.5
  • Maximum Input Current: 1.5 per bank
  • Charge Reset: Battery Voltage Threshold: Below 12.8 V /timed
  • Working Temperature: 0° to 50°C
  • Storage Temperature: -20° to +60° C
  • Over Temperature: Auto overtemp foldback
  • Ripple and Noise: 50 mA at 30 kHz
  • Enclosure: Polycarbonate, sealed and potted
  • Output Banks: 4
  • Recommended Use: marine, outdoor harsh environments
  • Housing Protection: IP 68
  • Regulatory Approval: ISO8846, USCG 33CFR1830-410, FCC part 15
  • Manufacturer Part #: GEN4
  • Made In: China

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Reviews and Ratings

5.00 Average
5 Stars 4
4 Stars 0
3 Stars 0
2 Stars 0
1 Stars 0
Rated 5.00/5 Stars from 4 customer reviews.

Do you own the GEN4? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

jim hoffman
Pros: Good product easy to install good teck help
Cons: no cons
your survey is to complicated needs simpler
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Written by on Jul 05, 2012. Ownership: Use regularly. Knowledge Level: AC/DC is more than a band — (90 of 167 customers found this review helpful
NOCO Genius 12v 24v 36v 48v 40 Amp On-Board 4 Bank Charger #GEN4
Pros: Great product. I use it to maintain four large batteries in an historic military vehicle. Fits nicely into the space on the vehicle available to put it.
Cons: None
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Written by on Dec 29, 2012. Ownership: Use regularly. Knowledge Level: AC/DC is more than a band — (86 of 162 customers found this review helpful
New Charger
Pros: This thing is the King Kong of battery chargers and I have had a few!! The LED lights work great inside my trailer from over 40' away. I have not had a problem with it yet!! besides being dead sexy it works like a charm and it is money well spent.
Cons: The Mounting situation is the only thing that I could complain about. It has four plastic holes that could be easily tore up. This thing does have some weight to it so keep that in mind when mounting. But dont let that put you off it is well worth it.
I purchased this thing to put in my Semi trailer it is a 53' double stacker with a 8,000 lbs liftgate. I hooked this up to an Inverter and it is charging while the truck is driving. It charges four of the big Yelleow top Optima's and works like a charm. Thanks Mike Bell Bell Transport.
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Written by on Jul 07, 2012. Ownership: I've thought about naming it.... Knowledge Level: AC/DC is more than a band — (86 of 162 customers found this review helpful
It performed great and I have worn it out and going to order a new one.
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Written by on Mar 01, 2020.

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Manuals & Tutorials


Data Sheet


Chargers Tutorial

Why does it read 13 volts?

Order Line: 1-800-362-5397
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Tech Help: 541-474-4421
Fax: 541-471-6014
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Grants Pass, OR 97526
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