I've installed a lot of inverters, but for data systems. (not UPS's) I have to ask just how much battery do you have? It is true that you will have total isolation. (super clean & low noise floor) But inverters aren't very effecient. Do you have a charger (rectifier) that can keep the charge up while your battery is under load? It would be interesting to try on audio gear. In the long run I don't know about the maintance. Sealed batteries last about 5 years and I know your not looking at wet cells. The installs that I am used to have a rectifier (AC-DC) charging the battery at all times. The battery acts as a filter while the inverter (DC-AC) supplies fully protected AC power. I would guess that you would have to have a system with extreme resolution to hear the difference between a PS power plant and an Inverter power supply. Maybe I can get a Tech to run some tests with my P300 vs an Inverter output.
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