If I have 3x Multiplus in a three-phase system, the factor 1: 0 rule I calculate 3x5000VA = 15000VA = max inverter power is 15000Wp?
Or for one Muliplus has 5000VA so max power is 5000Wp?
asked
I need more detailed factor 1:0 rule explanation.
Max inverting power is 5000VA per phase. If you have 10kVa load on one phase it will show an overload on that one phase.
You will have a total of 15kVa inverting power, so that figure is what you use for battery bank sizing.
Beware that watts and kva are not the same thing. And power factor can affect the output and overload warnings as well.
The factor of 1:1 is for AC PV inverters. So in your case one that fies 5000VA per phase.
Thank you Alexandra. So if I have 10k Fronius inverter is about 3.3k per phase and should be OK? Battery capacity should be 4,8kWh per 1,5kWp AC PV power. My battery is 10kWh so I know that is not enough. Should be about 30kWh.
If the Fronius is the three phase model then yes.
Your battery bank needs to be able to support at least a 312.5A continuous rating (not peak) absolute minimum.
Most compatible batteries have a victron associated webpage so will give minimum sizing there for the system you are looking at.
