How to clean up mains power?
These units cost a lot more than the normal line interactive UPS.
Why? These and the other types have:
1) battery charge circuit
2) inverter that generates AC output to the load
3) some kind of power-fail switch-over (the double-conversion type may
eliminate this altogether)
4) line filter
Please enlighten me. Why should the double-conversion UPS be so much more
costly?
Sparky
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