I am currently considering getting a battery storage system.
It's unfortunate because it's too late for subsidies (Just left 1k€ lying around, battery subsidy 10,000 Houses Program), but that's how it is now. I had a Kostal Plenticore 8.5 Plus installed, just in case I feel like it, so only the battery is necessary. My solar installer mentioned a price yesterday: €3750 net + installation for the BYD BOX HV 6.4 kWh version.
Question: The system on the south roof has 8.68 kWp,
1. Does a BYD HV battery with 7.7 kWh make sense due to the size?
2. I usually get home around 4-6 pm and can currently charge my electric car (14 kWh Kappa) for 2 hours with 3.1 kWh, then logically have less photovoltaic supply until dusk. At some point it switches and I draw from the grid. It would be bad if the car empties the battery until (no idea 10 pm) and the consumers at night (controlled residential ventilation, refrigerator, hot water, etc.) need more than the car used!
Does the battery make sense with the car? Or is increasing the self-sufficiency rate through an additional battery already disproportionate because of the electric car? I will have a self-sufficiency rate over 40% (felt) without a battery (because the car itself can be considered a battery).
...and now please don’t tell me I should get a bigger battery.