When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
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1 Adjustable Dual Battery Isolator Relay. Gearzaar 12V 140Amp battery isolator designed for two battery systems, allowing two separate power sources while charging with one alternator. Adjustable delay function to avoid frequent switching due to unstable current, prolonging battery and isolator life.
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When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
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Note: The benefit of this type of relay is that it does not require a connection to the alternator or any modifications to the existing vehicle electrical system. The location is very good.
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A VSR is a relay that separates the car's main cranking battery and the secondary accessories battery. The VSR is triggered by detecting when the alternator is running and charging the car battery. When the VSR detects that the car is on, it says "Hey the car's on!
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140A Max rated at 14 volts. Max Current Load: 140A. Relay Closes (Makes) at 13.3v & Opens (Breaks) at 12.8v. Three simple connections - Primary Battery, Auxiliary Battery & Earth. Continuously monitors the charging rate of the alternator to make sure your leisure battery is maintained in optimum condition.
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When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
eBay
When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
eBay