I have a Inverex UPS (single battery, 1000VA Pure Sine). I want to place a Servo Stabilizer before the UPS to get constant voltage. However when I tried the UPS charged fine but when the Power went off the Servo stabilizer went crazy and I could see that its moving around a LOT. Checking the voltage it was clear that the input to UPS somehow still was showing a voltage (maybe the servo stabilizer neutral is somehow connected to power through a board inside?)
I tried two different stabilzers and both behaved the same so its not a UPS issue but maybe design of a servo stabilizer makes it incompatible to use with UPS wiring.
I am thining of connecting the neutral on the UPS output side to house neutral. Any comments? Ideas?