I too use double conversion UPS. Liebert Vertiv GXT4 in my case. The power in my neighborhood is sloppy and the power company refuse to replace the transformer until it goes out entirely. The neighbor has a septic pump that creates nasty spikes. I've had multiple APC UPS literally catch on fire. It's always the tower models with the real time voltage regulators that catch on fire. The floor power strip models have been rock solid, but they would beep every time the neighbors pump kicked on. I tried power conditioners, filters, isolation transformers, but in the end, it was the double conversion UPS that cleaned everything up and the Liebert has provided reliable power ever since. Some day I want to go solar, but I would have to move somewhere else first.