The US Powergrids are substantial. I am completely opposed to use of storage devices for collecting solar as then you are dealing with hazardous lead acid or other batteries. Then what do you do with the waste. That is a solution for hermits who just want off grid. I prefer the method of put on enough solar\wind\geothermal resources to equal or exceed your annual average usage and feed back to the grid. Then you are helping others as well as pushing to the grid when you are gone for the day which is also when there is a very high electricity demand for commercial. Why not get others using 'green' power with or without their knowledge. In the US power companies MUST let you back feed to the grid. If they don't a fairly simple legal action will allow you to. There is just something about watching your power meter spin backwards. This also helps to wash your utility bill.