I had EDF ENR around last week to make an assessment and give me a quote Guy. I’ve also looked at Ikea. but need to look again.
EDF was about 19K for 4 kW crête with a payback period of about seven years. An assessment on the IKEA installer’s website gave me a price of 10K for 4.6 kWc 0r 11K for 4.8 kWc with better panels that would improve overall performance. I don’t know if the IKEA system feeds back into the grid, so maybe a battery would be needed to get the best benefit.
I’m quite keen but have too much on at the moment to focus. Plus research leads me to believe panel efficiency could double (from 10ish to 20ish percent) in the not too distant future.
BTW, there seems to be an inverter per panel with the EDF installation.