On 7/14/19 9:06 AM, Peri Hartman via EV wrote:
How hard would it be to build a battery system that normally supplies
100% of the domestic power but, when depleted, switches over to supply
domestic power from the grid ? Also, I think it would be safe
assumption, or at least a reasonable simplification, to assume that the
battery is always sufficient for the load, except when depleted. The
battery would always be charging from a solar array, never from the grid.
It seems to me, a system like this would completely circumvent any
negative conditions imposed by power companies. Of course, once the
solar panels fill the battery, excess production is lost.
You have described a PowerWall. The battery is one or more units that
will supply or charge 5kw and holds 13-14kwh. If about 11kwh will carry
you over night and if you don't use more than 5kw over night, a single
battery unit will serve you. With good sun, day time self power use can
be around 20kw, including car charging.
In 5 or so months, I have bought less than 10kwh from my utility and
sold them something like 10,000 kwh. That is with one battery unit.
Cost installed was about $13k. For smooth operation, I am highly
dependent on the utility to accept my excess power.
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