Re: APC Smart-UPS float voltage experiment

DIY external case placed under the UPS unit (fireproofed OSB wood -4-5 layers of fireproofing gel-, digital temperature monitoring on each battery including sound alarm if the batteries ever exceed 37/42C, fan to cool everything down in case it needs it (starts at the 37C step), voltage monitoring for each battery, plus the whole pack).

Quite pleased of how it turned out, I could have only wished to make it out of metal, but sealed batteries are pretty safe. They only got to ~34C max during 950W load test in the summer. That...

Re: APC Smart-UPS float voltage experiment

Hi guys,

Sorry for resurrecting a 4yo thread. My SUA1500 is charging my batteries at ~13.85v (float voltage), which is making them last about 2 years. It's a bit costly, being 40Ah AGM batteries (spec sheet for the batteries here: [url]https://cdn.badcaps-static.com/pdfs/f07daeda726ce85782eb2309705b02aa.pdf[/url]).
I'm curious if the resistor mod would work on my version. It's the old SUA1500, without digital display, only LED indicators. Any idea?

@zaharel91 - Can you please give more details about how...