My apologies for sticking my nose in AGAIN. I got a quote for batteries, inverters, panels installed finish and klaar for Euro 13000-00 That was based on .5Kw continues use over 24hrs. (I will get ALL the amp charge/discharge figures  should someone really want to look at it...) but that would give a household  of 2 grown-ups and 2kids sufficient supply. Our figures excluded vacuum cleaners, iron's, microwave's, hair drier's washing m/c on hot cycle's. It has been decided that these items will run whilst a generator is running (which was something that was not part of the quote). The rest of the stuff is gas where possible.