Thoughts and Ideas on Battery Powered Amplifiers?

I'm sorry, your voltage fluctuates between 100 and 122 volts??

Where do you live???

If it is anywhere in the USA, that is a serious issue and should be reported to the local utility.  Since I work in the utility industry I can tell you they take that seriously and will respond by checking the voltage in the area and your unit and will repair or replace transformers and other components to make it right.

Write to them and let them know the problem (make sure it's in writing) and use the word safety issue in your letter.  

If it is anywhere in the USA, the utility is obligated by law to provide safe and reliable service.

enjoy

Some would switch from LP's to 45's then.

No to be funny but can you recharge your BBC batteries with a bike powered generator....excise and man power.

Red Wine Audio has some

I have a battery powered Tripath Class D amp that sounds as good as any amp I've ever heard.
Custom made with all top quality caps, WBT inputs, and Cardas speaker outputs. 45 wpc at 8ohms and 90 wpc at 4ohms.
I am very happy with it.

Analog_source, problem with most of amplifiers is that its linear power supply is unregulated and it is AC only. Switching power supplies on the other hand are load and line regulated and often work on DC voltage. Some are better some are worse. Computer switchers are horrible but Icepower built in are very decent. Rowland uses new 1MHz switcher in Model 625 (class AB) amplifier. This power supply is extremely quiet with zero current, zero voltage switching. Many people believe that power supply has to have huge transformer and a lot of electrolytic caps while transformer of the same power at 100kHz is 10x smaller. Also electrolytic caps are smaller because frequency is much higher (filtration). Finding amp with regulated power supply would perhaps be the better solution than using external regulators or batteries and inverters. Switching power supply, like one in my Rowland 102 (Icepower) works also on DC making it immune to presence of DC on AC line (subject of headache for many).