Probably been asked for before, but have not found anything 100% useful.
Would like to be able to dump excess PV Linear into a heating element to help heat up the house when there is excess PV, but would like it to be Linear (not just 2x contactor on/off).
Is there any device from Victron available that can do this or will it need to be DIY? Or are any other manufacturer make items like this.
Node-Red is available for the programming part.
Cerbo GX does not have any analog outputs (for converting excess PV), but probably VE BUS etc. could be used .
Probably need a bit more info of your system. If you are grid connected and feed back into the grid there is AC THOR which is dynamic and you can use in on heating elements, it also connects to victron erquipment.
I have the exact same question - system is sized for EV charging so I have lots of surplus available, I’d like to capture that and dump into resistance heating in a shop slab. I don’t need thermostatically controlled heat in the shop, just want the ability to capture excess potential and take the chill off. I could use contactors to engage one zone at a time, but that would mean some areas of the shop would be really warm, other zones could seldom see surplus. A linear control would really be preferred.
If you’re grid connected you can either use a Fronius grid meter and Ohmpilot, or use the mentioned ACThor.
If you’re off grid and use frequency shifting to throttle your AC PV inverter, you can 't use the Ohmpilot but you can use the ACThor.