I'm guessing the BG1 has a robust AC power structure? I've always heard that you can use inverters for stuff, but you should use stuff that has a very tolerant AC>DC stage cause the inverters are less than perfect AC.
I hate to stray here, but it is important. Especially if it saves gear or time from bad inverters.
My post said Exeltech inverter. The cheap inverters are useful for a lot of things, just not running preamps. I have quite a bit of experience with them from running in remote areas where there is no a/c. Even the claimed sine wave inverters from China are often junk (as evidenced by performance and teardowns). Some inverters that look good, with cooling fans, proved to be junk. I've had great luck with some small ones I bought at Costco. I use those for charging laptops, camera batteries, etc. If you can't find the actual manufacturer of the inverter (aka, just a label slapped on a box from China), don't expect much.
I initially hoped I could run the BG1 on a tiny cheap inverter but it did not work well. The BG1 uses about 20 watts of A/C.
Here you can see the FFT image of the BG1 noise floor on a cheap inverter vs. wall power. In these samples I am stepping through the amount of gain, with inputs open. With the CI, the noise floor is much higher across the frequency spectrum. It also imparts a particular pattern to the FFT of the noise floor. It did bad things to the sound. It sounded sorta "ok" if you had no other comparison, but far from the clean, euphonic sound of the BG1.
http://taperssection.com/index.php?topic=71722.msg960770#msg960770The Exeltech's are US made, and are availabe to run on 12, 24, and 48 volts. It's a real brand, and they have been around for years. Mine was $200. Larger versions are frequently used for alternative energy systems. The nice thing about this Exeltech is it also gives you the ability to run tube preamps in the field, like the Hamptone, etc.
"Modified sine wave" is *not* a sine wave