We have a PV system with 4 inverter Quattro 48/500/70 and 2 battery-box Pro 13.8.
Righ now we are only going to expand the photovoltaic system to 10.9kW, but the AC- coupling manual indicates ""Each additional 1.5 kWp of AC PV will require an additional proportional 4.8 kWh increase in battery storage""
10.9kW (AC PV) / 1.5 kWp x 4.8kWh = 34.88kWh
but, I have 27.6kWh (Battery)
Can I expand the System without more batteries?
or I have to add more?