i don't know a lot about this subject... but a client had an experience that may be of value to those of you not planning to build a solar-powered studio, yet working in a solar setup...
my client was somewhere out in the australian boonies, and had found a great-sounding room in a friend's solar-powered house. she wanted to record there on her laptop/mbox, but it kept crashing. she emailed me to see if i knew why she was having problems, but with minimal info, i couldn't help her.
when she got back to the states, she told me she'd eventually found out that the house did have solar 110V, but that it hadn't been rectified to sine wave--it was square wave power. that was what was making her computer crash. lucky me, i had the task of assembling many of the partial takes that she got before her various crashes....