US solar energy company SolarMax Technology Inc (<a href="https://www.nasdaq.com/market-activity/stocks/smxt" target="_blank">NASDAQ:SMXT</a>) has signed a pact to develop about 300 MW of solar power and battery storage facilities to serve cryptocurrency mining firm SOS Limited (<a href="https://www.nyse.com/quote/XNYS:SOS" target="_blank">NYSE:SOS</a>) across the US.