The battery is Lifepo4 chemistry with a good solar controller from electrodacus.com. I typically drain to about 65% so these are considered shallow cycles. I

The battery is Lifepo4 chemistry with a good solar controller from electrodacus.com. I typically drain to about 65% so these are considered shallow cycles. I think the battery will go for 15 years & the panels too. So 25 years was a bit of a stretch but 15 years electricity for $500 was pretty OK. Solar energy really is cheap. There are many parts of the world where it makes the most financial sense.