KeyLine ChargersDual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black

KeyLine ChargersDual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black

Q: What gauge is the supplied wires?

The kit comes with 7 AWG wire, but wanted to comment on the customer who stated that it is not enough for a 20 foot run. At 140 amps, you would need 1/0 AWG wire, but with 95% of the applications out there, the most current that is drawn is around 30-50 amps and that is why we designed the kit with 7 AWG for the 20 foot run. I hope that helps clarify.

Q: Will the alternator charge battery 2 with this while car is running

Yes it will. That is precisely one of the features it is designed to do. Thanks

Q: I have a 2020 wrangler with a 240 amp alternator. is this rated to work with my alternator? i will be adding a second battery for low-draw accessories

Hello, a 240 amp alternator is definitely a big alternator, however, it is rare that an application would draw more than 40-60 amps at any one time. It is not so much the alternator size that would cause a problem for our isolator it is the draw from the accessories. I would recommend adding up the amperage draw from your accessories when they would all be on and determine the draw, if it is under 140amps then it will work well. If you decide to go ahead and use our Keyline Battery Isolator then you may want to install a large 140 amp fuse or breaker to ensure your alternator won't fry the isolator, but again that would be a rare accessory draw application like an induction cooktop or something similar that would draw over 100amps. Remember that the alternator is only going to push enough amps to power the draw of the accessories and to charge the battery (which also has a low amperage draw). Hope that helps. Thanks for the question.

Q: can this be use to charge a lithium batteries on the second battery?

Short answer: it depends. Longer answer: it depends on the Li bank capacity, battery charging specs, alternator specs, resistance of the entire circuit, etc. In my case I replaced 220Ah of flooded lead-acid with 100Ah of LiFePO4 and demand on the alternator actually /decreased/ a bit. If the isolator is already installed you could test it briefly to see what voltage/current from the alternator is like. If you do not already have the isolator a DC-DC sized to your alternator's rating would be a safer bet.

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Product ID: 322654187

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⚡140A Power

🔋Dual Battery

🌧️IP65 Rated

Frequently Bought Together

Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine

TKDMR 10pcs 1/0 AWG-3/8 Battery Lugs,Heavy Duty Wire Lugs,Ring Terminals,Battery Cable Ends,0 Guage terminals,Battery Terminal Connectors with 10pcs 3:1 Heat Shrink Tubing

10pcs 4 Awg - 3/8" (M10) Sanuke Wire Lugs Ring Terminal Connectors Ends, UL Listed Heavy Duty for Battery Cable Lug Wire Electrical Eyelets with 3:1 Dual Wall Adhesive Heat Shrink

Description

🔌 Power Up Your Adventure with KeyLine!

COMPACT DESIGN - Fits seamlessly under the hood or in tight spaces.
RUGGED RELIABLE - Built to withstand extreme conditions—dust, water, and vibration.
ZERO VOLTAGE DROP - Experience uninterrupted power with zero sacrifice!
CONFIDENCE GUARANTEED - 12-month warranty and 30-day money-back promise!
SMART VOLTAGE SENSITIVITY - Automatically manages battery health for peak performance.

The KeyLine Chargers Dual Battery Isolator is a cutting-edge 12V automatic battery disconnect switch designed for optimal performance. With a robust 140 Amp capacity and a compact size, it ensures your primary battery remains charged while providing rugged durability for off-road and extreme weather conditions. Backed by a 12-month warranty and a 30-day money-back guarantee, this isolator is perfect for vehicles, ATVs, boats, and RVs.

Specifications

Manufacturer	KeyLine Chargers
Brand	KeyLine Chargers
Model	ISO-Variation
Product Dimensions	5 x 5 x 5 cm; 272 Grams
Item model number	ISO-Variation
Exterior	PVC Matte Black
Manufacturer Part Number	Iso-Pro140
Item Weight	272 g

Have a Question? See What Others Asked

What gauge is the supplied wires?

Will the alternator charge battery 2 with this while car is running

I have a 2020 wrangler with a 240 amp alternator. is this rated to work with my alternator? i will be adding a second battery for low-draw accessories

can this be use to charge a lithium batteries on the second battery?

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Excellent communication throughout the order process. Product is perfect.

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