oh yeah.. dont be so sure u'll ROI, with the current prices and the way its going, you'll be in it for the long run. Please remember that 
Yes, due to reason I just want to ask is it being more logical to buy gpu(s) instead of ASIC miner at least I am able to sell GPU(s) or use them for my own personal needs
And yes, the reason of strict 5 kW restrictions is system batteries not the solar panels and I don't know much about solar panels as well