It’s great. I have an EV and fill it up when the price goes negative when there is loads of wind and solar.

£9k through my energy supplier Octopus

FOXESS EVO10

From octopus

I bought 3.5kw and a 10kwh battery in June and it’s amazing. Bills are 90% cheaper and it’ll pay for itself in 5 years with underwritten warranties for 25 years on the panels and 15 on the battery