Well after a few Covid-related delays, our installation is finally going ahead this week. I was interested to learn that the batteries, which are LiFePO4, don't contain any Cobalt or Nickel and are charged direct at the 400V coming off the panels. They are also not susceptible to thermal runaway and won't catch fire, which is quite reassuring. Guaranteed for 12 years and apparently (according to the installers) the evidence is that they are lasting much better than projections. We shall see.

Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE