Hello,
I would have a question about the configuration of a 3-phase system in a family house:
3x Multiplus II 48V / 5000VA / 70A-50A.
Battery storage 3x BYD LVS 4kWh - total 12kWh.
PV panel 12x Longi 445Wp (total 5340 Wp).
Cerbox GX with GX Touch 50
The system would be connected to the grid, including grid overflows, when the batteries are charged and the load is covered.
Unfortunately, in my country, the distributor uses electricity meters to measure each phase separately. So I need Multiplus to regulate each phase to zero at the meter measuring point in case of enough energy from the panels.
So my question is:
It is better to connect the panels as AC coupled via SolarEdge inverter with optimizers on each panel (for higher efficiency). Or use a DC coupled connection with MPPT 250/85 Tr VE.Can.
In the ESS manual, I read that with the Three-phase ESS with the Multiphase regulation setting - "Individual phase" there are large losses regarding the conversion of DC-AC (panel-inverter) and subsequently AC-DC from one phase via multiplus to DC- AC to another phase via multiplus.
btw if possible, then I want to use all the electricity produced in the house, only overflows in excess of my own consumption to send to the network as the selling price is 10% of the purchase price of electricity.
thanks for the anwers
Luke