Mike wrote:

"Ian Stirling" wrote in message
...
Batterys are an issue.
They last at best 5 years.

If you insist on maintaining everything, you're probably looking at
around 400W for 4h, that's 800Wh, or some 300Ah at 12V.

Maybe 40-80 quid a year for battery replacement.

Not sure I want to maintain everything. But certainly the 'essentials'. I
could live with ?40 a year in batteries though.

It's probably more like 200 every 5 years.

Any thoughts on the best products to use ?

Not really.
I haven't looked at appropriate products, due to being able to make do
with a BEST 600 UPS, fitted with 4 car batteries at a tenner each
from the scrapyard.

I'd ask over on alt.solar.photovoltaic, alt.energy.homepower, or
alt.energy renewable.
Maybe look at any FAQs.