On 4/1/19 8:01 PM, Ron Solberg via EV wrote:
You might also add a better alternator that is powered from your
I put "alternator" where I meant "inverter".
battery pack. That is, in parallel with your existing inverter.
Thanks to your sharing your PowerWall success story. I am considering
a different direction. I will try to keep it short. I rent houses and
in 2010 using ClipperCreek CS80 EVSE, we added a charging service. We
only charged 5 Teslas Model S cars before nearby Sioux Falls SD got
their Superchargers. our max is only 20KW or about 50 Miles/hour of
charge. I am still optimistic I could add a Power Wall to one of my
units across the street(If I could get one), and forget using an
OutBack inverter with an L16 battery pack.
As you probably know, the Tesla "Wall connector" is now down to about
$500 and will do 20kw. The cheapest EVSE around. It was only the
properly equipped early Ss that could use the full 20kw. I believe 3s
can only use 10kw or so.
By itself, a single battery PW will only do 5kw, both in and out. With
a capacity, of 13-14kwh, it is not practical to charge a big EV battery
with only a PW. That is, at night. HOWEVER, the PW allows you to use
your grid tie PV inverters. So, at my house where I have the PW, I tend
to charge cars between about noon and about 5pm and I try not to charge
beyond my PV capacity. Right now, that capacity is up to about 10kw.
So, I tend to charge at about 3kw and sell the rest to the grid. My
goal is to use no grid energy and only sell to the grid. Since the PW
was installed about two months ago, I've been successful. I get through
nights (without air conditioning) on around 7-8kwh from the PW battery.
I don't imagine I'll be able to maintain that success when air
conditioning season arrives. An option would be to add a second PW
battery but I don't expect it to be worth the cost. Compared to the
initial install, adding second and subsequent PW batteries is very easy.
Each added battery gives you 5kw additional power and ~14kwh
additional capacity.
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