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12V ups


Hello, I am looking for a recommended reliable design of a 12V lead acid based ups.
The purpose is to power a couple of arduino boards, and a 12V router modem so as to have an uninterruptable arduinos - Internet connection.
The total current is estimated to 2.5A. The battery would be a ~10Ah one
I was thinking of a ~ 2.5 - 3A current injector based on a 15V linear regulator powered by a 18V laptop power supply. The current would flow untill Vbat ~ 13.5V.
Thanks for your help


Well-Known Member
Most Helpful Member
I'd just use a basic 12V "smart" battery charger with a rating around 5A or so.

A smart charger should adjust the current according to the battery state of charge, so can be connected indefinitely.

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