My application is a 36v golf cart (3 x 12v) - I'm assuming that I could use this for a battery maintainer (one "channel" for ea 12v battery)?

Yes. Channel 1 to battery 1, channel 2 to battery 2, channel 3 to battery 3.

I have 2 group 31 Deep cycle batteries in series. Is the charge time with this charger longer leaving them connected? what's the difference?

As long as there is nothing hot feeding off the battery should charge just as fast either way. Leaving the charger connected all the time won’t hurt your batteries. It will go into standby on its own once the batteries reach full charge

Can this be used for all types of standard 12V car batteries?

Yes, it works on 12 and 24 volt systems. I love mine and it will also tell you if your battery is bad. You will love it, works great!

Is it supposed to stay lit after unplugged from marina? Mine is off while the boat is out.

No it doesn't stay lit when unplugged from the power supply.

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NOCO Genius GEN5X3, 3-Bank, 15-Amp (5-Amp Per Bank) Fully-Automatic Smart Marine Charger, 12V Onboard Battery Charger, Battery Maintainer and Battery Desulfator with Temperature Compensation

NOCO Genius GEN5X3, 3-Bank, 15-Amp (5-Amp Per Bank) Fully-Automatic Smart Marine Charger, 12V Onboard Battery Charger, Battery Maintainer and Battery Desulfator with Temperature Compensation

Product ID: 435636446

Details

Brand
NOCO
Input Voltage
12 Volts
Item Weight
2.76 kg
Output Voltage
12 Volts
Specification Met
UL

⚡15A total output power

💧Waterproof for marine use

🔋3-bank simultaneous charging

Description

⚡ Stay powered, stay ahead — the smart charger every pro needs!

TRIPLE PORT POWERHOUSE - Charge 3 batteries at once with 5A per bank for ultimate efficiency.
BATTERY HEALTH GUARDIAN - Includes desulfation and temperature compensation to maximize battery longevity and performance.
MARINE GRADE WATERPROOF - Built to withstand harsh marine environments—rain or shine, your batteries stay charged.
SMART FULLY AUTOMATIC - Intelligent charging adapts to battery needs, preventing overcharge and extending battery life.
RAPID 4 HOUR CHARGE CYCLE - Get back on the water faster with a quick, reliable charging time.

The NOCO Genius GEN5X3 is a 3-bank, 15-amp fully-automatic smart marine battery charger designed for 12V onboard systems. It delivers 5 amps per bank, supports rapid 4-hour charging, and features waterproof construction with advanced battery maintenance functions like desulfation and temperature compensation, making it ideal for professional marine and automotive use.

Specifications

ASIN	B08G3F4RN8
Amperage	5
Battery Charge Time	4 Hours
Best Sellers Rank	#1,573,790 in Electronics ( See Top 100 in Electronics ) #1,925 in Mobile Portable Power Banks
Brand	NOCO
Brand Name	NOCO
Charging Time	4 Hours
Current Rating	15 Amps
Customer Reviews	4.6 out of 5 stars 3,413 Reviews
Global Trade Identification Number	00046221190465
Input Voltage	12 Volts
Item Weight	6.09 Pounds
Item Weight Unit of Measure	6.09 Pounds
Manufacturer	NOCO
Manufacturer Part Number	GEN5X3
Model Number	GEN5X3
Number of Ports	3
Output Voltage	12 Volts
Specification Met	UL
UPC	046221190465
Warranty Description	No Warranty

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