It sounds like you are using an offline UPS, they are for protecting against power loss only. ie the inverter operates only when the power is out, normally it is bypassed. What you might try is a power conditioner or, if you are willing to spend the money an online UPS. With an online UPS, you are always routing power through the inverter, even when the line power is normal. Note that they are(usually) signifigantly more expensive than the cheap standby UPS's that you buy at Office Depot or Walmart.
Last edited by IanR; 04/27/09 11:46 AM.
