I didn't buy this for a regular charge controller. I bought this as an experiment to run a generator set to turn on the generator and the generator and inverter take care of charging my battery. The inverter supplies up to 100 amps to charge the batteries. So if you're using a relay to turn on a generator set, this charge controller will do the job well. I can adjust the voltage when the genset starts and when it shuts down. It was a simple mod to solve a very complex problem. I hope he keeps working like before.