Actually, I am proposing something simpler than a power wall - that does
not feed back to the grid. Maybe that simplification doesn't reduce the
cost of the battery system much, but it would reduce the legal paper
work down to a normal electrical permit.
Peri
------ Original Message ------
From: "Willie via EV" <[email protected]>
To: [email protected]
Cc: "Willie" <[email protected]>
Sent: 14-Jul-19 7:30:58 AM
Subject: Re: [EVDL] Solar off grid with an EV? (transformers)
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.
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
