posted on Tue May 18, 2010 5:21 pm @westom,Actually, there is a reason to get a UPS with AVR that is independent of what you have just said.If you have really dirty power (lots of spikes/sags) and a standby UPS without AVR, the UPS will switch to the inverter and back very frequently, since the inverter will kick in every time the line voltage goes out of spec.