Off grid system basic principles
I have some fundamental questions around the interactions between the PV array, charge controller and battery.
When a battery and charge controller is involved, does the electricity from the PV panels (charge controller) always go via the battery before entering the inverter and load? In other words, does the battery always feed the load? In that case, I have som questions:
1) Say the load is 1000 watt and the PV panels produces 1000 watt. Will the electricity just go through the batteries without charging them and straight to the load? Or will the electricity delivered to the load come from the existing energy stored in the batteries, and electricity from PV panel will always just charge the batteries?
2) Must the battery always be able to deliver an instantaneous power that matches the load? Say the PV array can deliver 10 kW and the load is at 12 kW. Will the battery need to be able to deliver an instantanous power of 12 kW? How does it work when the PV power and battery have to deliver power at the same time?
Hope you can answer