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<p>I meant the efficiency of the electrical transfer of energy to
the EV battery, not necessarily total system efficiency. In
general, higher charge rates means more heat, more line losses,
etc. Just look at the efficiency specs vs charge rate for any
battery; its basic physics. The lead acid battery side of the
system especially works better at lower rates, but in your case
you have surplus PV, so the house batteries are no longer really
part of the equation. Again, electrical efficiency is not
always the end all, beat all; taking advantage of excess PV in the
summer is improving overall system efficiency by utilizing power
that would other wise be wasted, even if the efficiency of the
energy transfer itself from one battery to another is a bit lower.
<br>
</p>
<p>On the other hand for a typical customer leaving the EV plugged
in over night to go to work the next day, a lower charge rate will
be better. <br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 6/8/20 3:54 PM, Chris Mason wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAG6C1qkcCeDTzX4x1DzsPCRWuHzkBKjCeaaVUb2dVPae9iM94g@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">>Lower charge rates are more efficient both for
the car's battery and the solar/ battery system
<div>I don't get that. Our house battery is full at about 11
a.m., so we have about four hours to charge the car. During
that time we make about 6KW, so the car uses 5KW of that and
charges up. If I went to the 120V charger, I would be charging
all day and it still would not be charged.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Jun 8, 2020 at 1:05 PM
Ray <<a href="mailto:ray@solarray.com"
moz-do-not-send="true">ray@solarray.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Also have a customer with a Leaf that can charge from a
dual GVFX system. He uses the 120 vac charger. Lower
charge rates are more efficient both for the car's battery
and the solar/ battery system, so I recommend sticking to
the 120 vac chargers if possible.<br>
</p>
<pre cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div>On 6/7/20 6:04 PM, Darryl Thayer wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">I was trying to charge a Nissan Leaf with
a ? Iam not sure but two VFX i think old age.. i mostly
rember having the problem. I think the car harger had
a max of 2kw</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jun 7, 2020,
3:41 PM Jay <<a href="mailto:jay.peltz@gmail.com"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true">jay.peltz@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="auto">
<div dir="ltr">I\u2019ve got offgrid 2 clients and they
have no issues. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr">They each have a Bolt and can choose
the charging rate. They can run it at either
power. But only use higher power when they have
lots of sun. </div>
<div dir="ltr">Older Stacked vfx and Schneider xw,
no issues. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I would expect the SW to work,
however it\u2019s an odd beast as it\u2019s waveform steps
change with load. More load, more steps, therefor
cleaner so maybe at lower charge rate it\u2019s not
clean enough. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr">As to your issue it could be power
factor Being really poor. </div>
<div dir="ltr">Can you tell us what inverter, yea 5
years ago is a long time. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Jay</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Peltz power. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Jun 7, 2020, at 11:53
AM, Darryl Thayer <<a
href="mailto:darylsolar1@gmail.com"
rel="noreferrer noreferrer noreferrer"
target="_blank" moz-do-not-send="true">darylsolar1@gmail.com</a>>
wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff
<div dir="ltr">
<div class="gmail_default"
style="font-family:"times new
roman",serif;font-size:large">I think
you said it well, about 5 years ago I tried
to charge a car from an off-grid system. I
did not record my events but the inverter
had twice the power of the level two
charger, yet the inverter would get hot and
trip out. I was told a ferroresonant
transformer may help, and it might be
different with different cars. However, I
was warned the ferroresonant was to stop
input wave problems from arriving at the
output not to prevent the output wave
problems showing up on the input. The
off-grid customer gave up.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jun
7, 2020 at 6:36 AM Hilton Dier III <<a
href="mailto:hiltondier@gmail.com"
rel="noreferrer noreferrer noreferrer"
target="_blank" moz-do-not-send="true">hiltondier@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p><font face="Times New Roman, Times,
serif">The issue with EV chargers is
that they create a lot of reactive
power. Think of it as "slosh" in the
waveform. That means that charging at
2,000 watts sloshes a lot more than
2kW through the cable, plug, outlet,
and from the inverter. If you've got a
reasonably good sinewave inverter the
charger will like it fine. However,
the inverter might not like the
charger if you cut things too close.
Make sure to have a lot of top end
left in your inverter. Always use a
transformer based inverter. The SW
series has a big chunk of metal in it,
so that's good. At 120V the Bolt will
only draw 1440 watts max.<br>
</font></p>
<p><font face="Times New Roman, Times,
serif">An aftermarket Bolt 240V
charger can draw up to 32 amps. That's
7.7 kW, so too big for an SW. Treat it
more like 40 amps. The OEM 120/240
EVSE (smart charging cord) that comes
with the car can draw 8 or 12 amps at
120V or 12 at 240V. Assume that the 8
amps is really 12 and the 12 is really
15 or a bit more. I have seen 15 amp
plugs and outlets with the hot prong
melting plastic around it. The plug on
the OEM EVSE is 20A rated but make
sure your outlet is as well.</font><br>
</p>
<pre cols="72">--
Hilton Dier III
Missisquoi River Hydro
Renewable Energy Design
</pre>
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