Hi,
I’m still very new to this. I’m wanting to connect a 240 volt hot water system to a relay port on the Cerbo Gx. I would like to activate it remotely (when I’m on the way to the boat)
Can someone please advise the best way to write this? I imagine the Cerbo can’t take all the hot water current and will require an external relay.
Please provide support on how best to do this
I connect shelly smart switch to water heater, then using Node red in cerbo to send Http request to shelly to turn on the water heater when i have excess solar. However Shelly have their own cloud for remote access to the switch directly but also supports MQTT/cloudless (if that's more your thing), which allows you to remotely activate it while away via internet connection
I also utilised the auto turn off timer in the shelly smart switch (I set mine to 1hour), just in case the messages from Node red/cerbo get messed up some how the switch will auto turn itself off after said auot turn off timer (for me 1hr).
I'm not sure if you can activate the cerbo relay via node red but if you're buying a secondary relay (larger for water heater). Then shelly might be a solution that's worth looking into. (16amps i believe is the max of the standard shelly switches)
I use one of the relays in the cerbo to activate a contactor/solenoid which switches on or off a resister with a termostat so it won't "boil" the water. I can activate it or switch it off via VRM with full control
