I've just had panels installed (in the UK)[0] and we use a hot-water converter [1]. If we're generating 2kW, and only using 600W - the excess of 400W is not fe

I've just had panels installed (in the UK)[0] and we use a hot-water converter [1]. If we're generating 2kW, and only using 600W - the excess of 400W is not fed back into the grid; it goes into an immersion heater and gives us hot water. That saves us on burning natural gas, and prevents problems with the grid. Now, depending on where you live, hot water may not be the most pressing problem. But it's slightly more practical that spinning up a fly-wheel :-) [0] http://shkspr.mobi/blog/2013/12/free-money-from-the-sky/ http://shkspr.mobi/blog/2013/12/free-money-from-the-sky/ [1] http://www.solariboost.co.uk/ http://www.solariboost.co.uk/