94JDH

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I probably fell lucky with timings, just before the big rush of people wanting quotes and prices rising, I'll message you the details of the installer when I get back if that helps you?

Batteries are VAT exempt if fitted alongside PV install, HMRC forums admin confirmed here for reference: https://community.hmrc.gov.uk/customerforums/vat/543eb674-79af-ec11-826d-00155d9736d7 And my quote and deposit paid also references no VAT

Should be fine - I have electric underfloor heating in the kitchen/diner/hall and utility and keeps the house much warmer than the gas boiler when combined with my wood burner. So bigger batteries are more useful to me in the long run. My total price all in is 14K.

If they are spaced over 400mm centres, the width is similar to mine and should be fine for the loading (do you have bracings between each joist of 400mm, approximately 3 across that width?)

Those would support a good load (depending on the width of the garage though). I ended up replacing a few sheets of 18mm ply where I had a leak and then completely overlayed a further 18mm OSB3 to provide a good adhering surface for the EPDM glue. I built a garden room gym a few years ago and the EPDM was ideal.

I've gone with 18 panels (7.2kW) feeding two 3.6kW inverters - each with an 9.5kW battery. Benefit from being able to charge both in the winter months with cheap 4 hour window.

Yes that systems looks similar, and the ballast looks neat as well.

I know there are now systems which will provide seals on fixed mounting systems - with a flat roof that always worries me with risk of failure. The main reason for the FS10 was to maximise the area available on an EW configuration. It's perfectly aligned EW and would take South facing panels, but due to shading from each row of panels, the greater number of EW panels offsets the efficiency lost compared to fewer South Facing.

Yes its wrong, could be a clerical mistake, but by keeping it separate it looks intentional. I'm also having an install on two flat roof areas using the Renusol FS10 system as I didn't like the bins - its still ballast type and I've just fitted an EPDM rubber roof (both bow EPDM) so didn't want any fixings through it.

The VAT should be on the total work, so you should still be saving that £823.88 It's still a little high in my opinion but market is swamped with enquiries - I would recommend getting a few more for comparison. EDIT: for your other question, the renusol console, as per your quote, is ballast weighted - they are usually filled with bags of stone or similar)