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Cheap UPS solution? (feddit.nl)

submitted 1 year ago by [email protected] to c/[email protected]

6 comments fedilink hide all child comments

I'm tired of buying a new 12 V battery every 1-2 years. I have about 4 small (rated ~ 300 W [not VA]) UPSes with 7 Ah, 12 V, maintenance free batteries.

I'm thinking about replacing them with one, powerful unit. But the more powerful the unit, the more it costs - non-linear.

Do you have experience with some DIY solutions? Like 12V DC to 230V AC inverter, battery charger, some UPS controller (simple relay?)?

Or maybe you have some other idea that is cheap(ish)?

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[–] [email protected] 1 points 1 year ago

I built a homemade one. 2.4kwh of capacity.

Should be good for a few decades easily.

Wouldn't call it cheap. But, it will be around for 15 or 20 years.

https://xtremeownage.com/2021/06/12/portable-2-4kwh-power-supply-ups/

[–] [email protected] 0 points 1 year ago (2 children)

I've had my APC 1000-UPS for 5 year and have only had to replace the battery once, though I think I may need to again by the end of the year.

[–] [email protected] -1 points 1 year ago

Do you remember what brand of battery it was?

I think the original lasted longer than the replacement.

[–] [email protected] -1 points 1 year ago

So, every ~2.5 years... Not that far off...

[–] [email protected] 0 points 1 year ago (1 children)

if you're running batteries down often enough to need battery replacements that frequently, you may be going 'too cheap' (poor quality and/or not enough capacity) to begin with, and would need an upgrade not another 'cheap' solution.

[–] [email protected] -1 points 1 year ago

Maybe this is a combination of cheap battery and temperature. I feel the chassis is a bit warm.

Mains is very stable here, only very short breaks like fractions of a second. So no deep cycle.

Thanks!