Afaik surt series with double conversion starts at 3kva(cost around 60+k some 6yrs ago), below that are line interactive only and stepped sinusoidal(this is undesirable for electric motor operated load)..
um sir, nakasulat sa specs ng SURT1000XLI:
Topology Double Conversion Online
Waveform Type Sine wave
Last edited by badkuk; December 23rd, 2014 at 04:31 PM.