PV 220v to heating element 250v dc relay using 12v coil through thermostat?

[shocked277]

I have been experimenting with this project for 2 weeks now.. I started with 24v dc heating element off my battery bank, but found I was using much to much power from my bank....So then I tried using a 120v ac element 2000w element with my solar array 250w x6 panels, 3 in series x2 in parallel . 90-100v at 1500w I was able to get about 135deg water but had a problem because of the thermostat not liking the dc arcing . Now I am looking for a high voltage DC relay that won't get so hot. I have tried a couple that say rated at 220vdc 40 amp but when it runs for 15min I noticed the temp was getting hot....even up to 260deg ....wow. So I am looking for a high voltage relay that could put up with up to 250v dc continuous with out getting so hot with a control coil voltage of around 3 to 24v so I could run it through my thermostat ...any ideas where I can get one that will work....Thanks

 

[SeaGal]

had a problem because of the thermostat not liking the dc arcing

How about using a SSR / IGBT and clamp the heatsink to the water tank?

 

[kommando]

Dimmer AC module for 16A/24A/8A 400-600V High Load, 1 Channel, 3.3V/5V logic

https://www.aliexpress.com/item/1005001965951718.html?spm=a2g0o.order_list.order_list_main.5.16a01802Pgzfpt

Software

GitHub - xlyric/PV-discharge-Dimmer-AC-Dimmer-KIT-Robotdyn: New model of Wifi Dimmer for distant charge of PV routing, based on the new AC-Dimmer KIT, ESP8266 Wi-Fi D1 Mini for AC 110~240V from Robotdyn

New model of Wifi Dimmer for distant charge of PV routing, based on the new AC-Dimmer KIT, ESP8266 Wi-Fi D1 Mini for AC 110~240V from Robotdyn - xlyric/PV-discharge-Dimmer-AC-Dimmer-KIT-Robotdyn

github.com

 

[AntronX]

Dimmer AC module

Can't use on DC. Once turned on it will not shut off. Have to use either MOSFET, IGBT or contactor rated for DC.