It also has the ability to protect sensitive electronic equipment powered from the auxiliary battery from harmful engine start-up spikes, and an emergency override feature to allow you to jump start your vehicle from your auxiliary battery. Suitable for 12VDC Marine, 4WD, caravan, and solar applications. Lugs for connections are sold separately.

When the engine is started and the start battery reaches 13.7v, the isolator engages, allowing two battery banks (start and house) to be charged simultaneously. When the voltage drops below 12.8v (eg the engine is stopped), the isolator disengages, separating both batteries.

POWERTECH MB3880 12V 140A Dual Battery Isolator Kit with Wiring Cables User Manual. Installation of the Smart Battery Kit is a relatively simple task and requires no special knowledge of vehicle electrics and uses tools available in most home workshops. Tools required are:

140A Dual Battery Isolator (VSR) Allows two batteries to be charged from your engine alternator at the same time. When your engine is on and the start battery is sufficiently charged the isolator kit will begin charging the second (auxiliary) battery simultaneously.

The Powertech Dual Battery Isolator Kit 12V/140A is ideal for getting 12V appliances to operate. With a second battery in your boat or motorhome, you can power your electrics and avoid draining the main starter battery whilst the engine is off.

The Powertech Dual Battery Isolator 12V/140A is ideal for 12VDC marine, 4WD, caravan and solar applications. The dual battery isolator can simultaneously charge two batteries from your engine alternator.

Powertech 140A Dual Battery Isolator (VSR) CAT.NO: MB3685 This VSR (Voltage Sensitive Relay) will allow your older vehicle to charge your auxiliary battery while you drive!

Split Charge Relay Dual Battery Isolator 12V 140Amp, Voltage Sensitive Relay VSR, Compatible with RV Marine Car Vehicles Truck Caravan Off-Road Camper Yacht, Not Fit for Lithium Batteries

MB3685 Basically, a voltage sensing relay will produce a good outcome for healthy battery banks but isolates batteries that fall below about 11.5V. A clever product. Specifications: • Continuous rating: 140A • Cut in voltage: 13.7VDC • Cut off voltage: 12.8V • Dimensions: 67 (L) x 67 (W) x 53 (H)mm See MB3880 for a wiring kit version.