Power supply to a thermostat relay
Hi i'm.working on my campervan and am trying to put a thermostat relay into the power supply to the fridge as it keeps freezing everything and draws power when its not needed. I'm running 12v from a battery through a solar controller which cuts the feed to the fridge when the battery voltage drops too low. The thermostat i'm looking at has a temp display and is programable so needs a constant feed. I only have one feed wire to the fridge so both the feed and the pass through of the relay needs to come from that unless i run a 2nd wire as a permanent feed to the relay. Is there a way of putting in somthing to keep the relay powered when the feed is cut from the main battery/solar charger to just keep the relay alive but not pass power to the fridge.