I have a question about using my Cerbo GX and Multiplus II together.
I want to heat a 240v water heater as either a dump load (when battery SOC is high) OR when shore power is available to the Multiplus.
This is simple enough with just the dump load setup - I can use the relay in the Cerbo to trigger at a certain SOC to a second relay to power the heater.
What I am wondering is whether it is electrically possible to combine the 2 AC outputs of the Multiplus so that the heater is ALSO powered when shore power is available - as the second AC out on the Multiplus is active only in this case. Maybe there is another way of doing this (like if the Cerbo logic could control the relay based on AC availability too).
I have attached a simplified diagram of what I propose.
Are the 2 AC outputs perfectly synchronous?
Thanks for any advice