I have a Cerbo GX with a DC Coupled SmartSolar MPPT 250/100 (VE Direct), an AC Couple Fronius Primo 8.2-1, and am waiting for my Multiplus II 48/10000/140-100 230V. Batteries are 9 x US3000C Pylontech providing nearly 32kWh connected to the Cerbo GX via CANBus.
I recently installed a large Samsung Heatpump/Aerotermia which provides hot water and central heating. This Heatpump can accept commands via relays or Modbus to increase the heat of the water and central heating (when activated) by some 5ºC when excess solar is available to avoid or reduce night power draw from the grid.
The question is how do I configure or set this up?
On the relay side, it requires two relays which would work with the following commands;
Relay 1 Relay 2 Heatpump operation
closed open forced thermo off operation
open open Normal operation
open closed Heating/DHW setting temperature 1 step-up operation
closed closed Heating/DHW setting temperature 2 step-up operation
Can I use the 2 relays on the cerbo GX for this operation or would MODBus be a better option as I plan to incorporate a Genset to this later?