InPhase Posted October 18, 2021 Share Posted October 18, 2021 Here is a simple circuit that closes a relay when a battery bank voltage is low and opens it when the voltage is high. Both set points are adjustable. My generator requires the start signal to be continuous, but it wouldn't work for a momentary start push button. This could also be used for many other events that are voltage dependant. I used an adjustable power supply to set the trip points. Many improvements could be made, but the simplicity works well for me. I also realize there's a typo on the design, as the is a U1 and a U3 but no U2. The 12 volt control power comes from an LM317HV, so it can be used up to 60 volts. Quote Link to comment Share on other sites More sharing options...
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