I am the lone electrician at a chemical manufacturing facility and I've been asked to repurpose a 30 amp solar system to supply backup power (in case of a utility outage) to our server rack. I have a 750 watt PV array feeding 6 2volt deep solar storage batteries. I've successfully managed to get the batteries charging from the array, but I have now run into a very new and somewhat stumping problem. I'm reusing the magnum 3112 modified sine wave inverter (30 amp single phase 120 inverter). I've installed a buck transformer to step the line voltage to 113V and small transfer switch that is normally passing the line in from the controlled distribution panel and back through to the lugs. When testing this equipment everything went swimmingly, however when we did our "final" failover tests (controlling the actual load ie server rack, complete with rack mount UPS) I discovered that the UPS units DO NOT like modified sine wave power. I am now in search of something, anything, that would easily and simply convert modified sine waveform to a pure or true sine wave, ANY IDEAS? I have considered purchasing either a pure sine wave inverter, as well as possibly using a VFD that takes in single phase and outputs three phase to clean up the waveform. Any help would be greatly apprechiated.