zlacker

Speaking of idiots, ordering batteries on Amazon is a great way to acquire really shitty batteries. Lead-acid works fine and is maintainable. The price parity is extremely recent and supply-chain problems still mar the lithium side.

Also, where did you buy your inverters in 1993? I've used about six different brands on various deployments and ten years is about right for MTBF there. I sure wouldn't trust a fifteen-year-old inverter to handle 3500VA continuous, and god forbid there's a spike...