Summary of the first month of my PV system, lowest generation month of the year (mid winter).
Power generated: 850kWh, ~28kWh/day, peak day 35.6kWh(*)
Power consumed: 550kWh, ~18kWh/day
Power exported: 250kWh, ~8kWh/day, peak day 13.6kWh
Battery power in: 300kWh, ~10kWh/day
Battery power out: 290kWh, ~10kWh/day
Battery round trip efficiency: ~96%
(*) the generation peak was when I ran both A/Cs flat out heating all day, ran 4 loads of washing through the machine and the dryer, etc. It was still throttled to about 50% output for 3-4 hours over peak generation times, so if I wasn't export limited I could be generating ~50kWh/day in the middle of winter.
Exports have been limited by high grid voltages - most of the month it was throttled right down (1kW max export) to prevent overvoltage disconnection problems. A firmware upgrade on the inverter added substantial demand/response functionality - it can now ramp down exports as grid voltage goes up. Hence it automatically maximise export according to conditions whilst preventing overvoltage conditions from occurring. That's roughly double the amount of power I can export (according to the output in the 3 clear days since it was enabled), but export is still extremely limited (2kW typical instead of the 6-7kW excess I can generate) by the high grid voltage....
Despite that, the system is working really well now that most of the teething problems have been sorted out. Happy :)
#pv #solar #hybridsolar #batteries
