![]() 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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