I have no plans of making more of these for selling.
The CAN bus is simply for communicating with the BMS.
BMS reports SOC, Cell voltage and also error message to the inverter if needed.
BMS controls the relay, so if there is something outside the parameters it will turn the power off.
I am by no means an expert on this, but its all done over this CAN bus.
Safety, and long lifespan if the battery is important.
The Sunny Island supports Lithium batteries, but ONLY if it receives signal from the BMS.
I used a lot of time asking different manufacturers if they made support for SMA, and this one did.
I do have the whole CAN protocol if anyone is interested, pm me.
Everything should be automatic, charging when surplus power is available and discharge when sun has gone down.
Usually i have an self consumption rate at about 50%, but with this system i should reach at least 80%, maybe more.
Not doing it for saving money, electricity is really cheap here.
Just really like the idea. And when i have an idea, i usually go thru with it