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need to buy a battery backup but not sure what specs?

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Do bear in mind, most low end UPS' have a changeover time. I've measured this across a few units with an oscilloscope and have found that the nasty "modified sine wave" (square wave to you and me) doesn't properly kick in for 15ms in some cases.

If you really have a concern about this, look up a "duel conversion" UPS. They are always outputting from their inverter (and most output a proper sine wave). So when there's a blackout or brownout, the supply is never lost.

Then it's just a case of sizing one for your printer.


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