From: John Newman <jnn@synfin.org>
   >When you can build a new home with solar panels all over it and tesla
   battery
   > arrays in the basement to keep you going at night, it's just possible
   to get to
   > the point where you receive a check from the utility company every
   month, rather than a bill ....
   >I think, and hope, this is the future of power in homes.
   >John
   Why should a house-installed solar installation use batteries at all?
   Batteries are big, heavy, inefficient, have a limited lifetime, and are
   made of expensive and potentially toxic materials, which can sometimes
   explode with little or no warning.
   I think of the AC power-grid as an infinite-capacity, indefinite
   lifetime, virtually 100% efficient, "battery".
               Jim Bell