Re. OP mentioning battery back up. Just a thought but a lot of places who maintain UPS units have a lot of surplus batteries that are often in reasonable shape. If you're careful and bring a multimeter its possible to snag a good unit which has lost capacity but otherwise works and techniques exist to rebalance units that have failed due to one or more cells going bad. I discovered by accident that taking a SLA that has failed for this reason and *carefully* discharging it from 5-8V to zero over a week then recharging from small solar cell voltage limited to 14.0V will sometimes bring it back: reversed failures on two units from E bikes like this. I actually determined that the repaired NP12-12 was almost as good as a new pack with only marginally higher internal resistance according to meters.
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