I don't think any solar projects use 60Hz inverters. ~10kHz seems to be the industry standard, although I believe some micro inverters go right up to 1Mhz (sa

I don't think any solar projects use 60Hz inverters. ~10kHz seems to be the industry standard, although I believe some micro inverters go right up to 1Mhz (saves on capacitors, copper, and steel, but you have to buy much more expensive silicon)