Btcmining.solar offers from 0.4% daily for 4 days as minimal profit for investment to 102% after 4 days as maximum profit.
Plans: 0.4% daily for 4 days (principal back); 102% after 4 days
Minimum Deposit: $1
Referral Commission: 0.5%
Payment systems: Perfect Money
This is what it says on Btcmining.solar website:
It is advantageous to utilize the suns energy via photovoltaics to mine cryptocurrency. After the pay back period of a solar power system (usually a few years), the cost of producing solar electricity for mining is basically free. Then you can realize the huge potential gains of mining the right currency.