![]() Cars don't try to optimise to keep the cranking battery at 100% you'll only get about 80% out of it.The disadvantages of a VSR are that you'll never fully charge your accesories battery, and thus never get full use out of it. The advantages of a VSR are that you get the potential full advantages of a dual battery system mentioned above, namely, that a) if the car is off and you're powering accessories, you won't drain your cranking battery, and b) if you need (in a pinch) to use your secondary battery to crank the car, you can override with the click of a switch. Circuit diagram for installing a VSR into a car Thus, your secondary battery starts charging. When the VSR detects that the car is on, it says "Hey the car's on! OK let's connect the two batteries". The VSR is triggered by detecting when the alternator is running and charging the car battery. This lets you run those accessories without drawing too much current through a single wire.Ī VSR is a relay that separates the car's main cranking battery and the secondary accessories battery. In cars and motorcycles, you use a relay on something like the accessories wire (that's only live when the bike is on) to power other high-current accessories, like extra lights, a fridge, or heated grips. This is suitable for under-bonnet set-ups where cables are short and batteries are the same kind.Ī VSR is a high-current relay that has simpler wiring than most relays.Ī relay (for those who don't know) is a switch that's triggered by voltage. The next best dual-battery system is one with a VSR. ![]()
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