How about just one (or two) of the inexpensive âsolar generatorsâ with 3600-7200 watt pure sine wave outputs? (Charges from wall, solar panels or both. Also configurable for either only 120v or split phase or just use the 15/20a outlets on the things)
Would also serve as normal power backup when power is out⌠unplug stereo and use power for required loads..
They are getting better and less expensive all the time. (And no permits/electricians required unless adding the home interface box for critical loads.)
Dual use, âcleanâ power, equivalent price in the end and no grid power used for audio. Â Just an idea..