Going to add another battery in my system, and I do not see any procedure for the inverter operation when doing so..ie, can I shut down my existing batteries, turn the battery breaker off, add my battery, turn my batteries on and open the battery breaker in the inverter or do I have to go through a complete inverter shutdown...if so what is the procedure. In the manual, it states that you cannot shut down the inverter under load...first turn of the grid breaker and then the load breaker, the PV breaker, the battery breaker and wait for the LCD to go off. Not sure if you have to do all of that to add an extra battery to the system. Thanks in advance