Solar hot water, me too

Author	Message
phil99 Guru Joined: 11/02/2018 Location: Australia Posts: 3320	Posted: 09:53pm 04 Mar 2023       " how is the thermostat in the hot water system going to handle DC. Won't it arc too much when it turns on and off?" If it were straight 210V DC it would arc until the thermostat is incinerated. If the controller pulses it often enough the arc might be extinguished before that. A thermistor clamped to the tank beside the thermostat, shutting down the controller at a slightly lower temp than the thermostat would be safer. Same as the kettle setup. Edit Looking more closely at the photo of the PCB it appears the thermostat doesn't switch the 210V directly, if so ignore the above. Edited 2023-03-05 14:26 by phil99