According to China banned Bitcoin mining, we need one competitive homing solution now.
My company lightningasic has finished Home solar power solution: 15KW：Solar panels + Inverter + Batterry. the price will be under usd 20K, Fob china. you just need to pay the shipment, and installed by your self. then you can run the mining at the home. the ROI is 30% per year.for btc mining, it means free eletcity.  if there is  1M miner join this plan, no one can stop the mining.
if you like, you can install Electric vehicle charging pile. make more profit.
stay tuned for more details.