This unit is rated 600VA / 340Watts. I bought it for an LCD projector that the user manual says draws a maximum of 290 watts, so should be 50 watts to spare? No, the projector overloads the UPS within a minute or so causing it to shut down and beep constantly, and this while electrical power is still on to the unit. I had to quickly pull the projector plug and plug it into the wall socket so the cooling fan could cool the projector bulb down. Returning the unit as defective and buying another brand with more wattage.