Exactly, I only want "solar" energy in my battery, and use this battery on line that are rarely use (shelter) or use a Automatic Transfer Switch (
https://www.amazon.fr/dp/B0CJC8TMYN...rial&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWwy&th=1) to use the battery on some of my house lines, when it's full, at night, instead of grid energy
I don't know if my idea is correct but inverters that I saw with AC coupled functions ( that can know how many amps to send to the battery to avoid grid energy) cost 800e for 3KW