I have had a 2.4kWp system for two years. Solis inverter, Pylontech batteries and a Myenergi Eddi.

The good: charging the batteries up at night (on an Octopus two rate tariff) means never paying more than 7p for electricity. In summer I maybe import 3kWh per day. Because the solar energy heats the hot water (via the Eddi) the gas bill has halved. The system I expect to last for >20 years and I expect full payback in around 7 years. A good investment. Since the inverter is chinese made they will probably remotely disable it before they invade, so I’ll get some advance warning and can brush up on my mandarin.

The bad: almost everything else I have installed (car charger, heat pump etc) has been more painful and required multiple visits from an electrician to sort out - I don’t want the solar batteries to discharge into the car when I charge it, and I don’t want the heat pump to drain the battery either. The installer was terrible and it took ages to get it all right. I had to hack the inverter with a modbus bypass to get it to work with Homeassistant. Thinking of getting aircon upstairs and dreading the conversation with the installer.

Overall: 10/10 recommend, wish the government would force everyone to have solar panels.