restorer-john
Grand Contributor
Sort of. The problem with UPS is that invariably the battery goes bad in them and you incur that cost. Or that the unit itself goes bad. I had had both happen a number of times.
Or like my UPS which uses 45 Watts just running online. Mine sits in the PC cupboard gathering dust now, the battery is (surprisingly) still fine, but I could not justify the 24/7 power usage for that one time (maybe) that I might need 15 minutes of PC power.
IIRC, internally it has two or three secondary taps it switches between to maintain the output at 230V if there are fluctuations. Then if too far out of spec, it switches to battery-inverter and beeps its head off!