The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.7 volts the VSR engages allowing two battery banks (start and house) to be charged simultaneously. When the voltage drops below 12.8 volts the engine is stopped the VSR disengages separating the batteries. This system eliminates the possibility of draining the wrong battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spikes.
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