How long do your batteries really last? I like solar and would install it but only if the house we were to buy.build was more than 1/2 mile from the electric. If electric installation was the same as a solar install ie $10,000 or more, I would choose solar. Most place we look at have electric. but if we found a place w/o electricity I would not want to dismiss it because of no electricity. My husband works with industrial electronics for public works. He understands most of the theory of solar. He is very cautious about costs due to battery maintaince. I am too. I see some use car batteries and wonder how they do it. I am very cynical about batteries for cars. I am lucky to get 3 yrs out of a car battery even if it is rated for 5. :soap: :soap: I figure our solar cost would be $15,000 to install not including the gen. $5-8,000 in batteries. Replacing batteries every 5yrs. would average out to a modest monthly electric bill. How long do larger batteries really last? what is the yearly cost for battery maintaince/ replacement? The battery bank is almost half the solar cost. give or take some. It would be horrid to have to replace the bank every few years. How do you make them last longer? How long have your batteries really lasted?