<div dir="auto">I second what Ray says<div dir="auto">Jerry</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jul 19, 2020, 12:49 PM Ray <<a href="mailto:ray@solarray.com">ray@solarray.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>There are so many really good Li Iron Phosphate Batteries
available, that are actually designed for off grid, that I don't
see any advantage to using a more unstable chemistry that is not
designed for off grid. AC coupled is a 2nd huge no no for off
grid, and can leave an unattended system completely inoperable.
Anytime the main battery inverter shuts off for any of several
reasons: overload, overtemp, low battery, etc., it also means that
all charging of the system ceases as well. <br>
</p>
<p>For Off grid, reliability is absolutely #1, and owner safety is
directly related to that reliability. They can lose water, heat,
refrigeration, and communications in an outage. I'm just tired
of folks dabbling in off grid, and not taking it seriously. Why
in the world would someone even consider using a product that its
own manufacturer says should not be used off grid?<br>
</p>
<pre cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div>On 7/19/20 10:54 AM, Jerry Shafer
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hilton, Wrenches</div>
<div>As I recall Tesla does not recommend their battery for off
grid applications, they need to be connected to the internet
and without that there may be warranty issues. I don't think
that the off grid world and daily cycling would work well over
time either. How would you jump start the power wall if it
died do to low voltage cut out, a genny might work if it
connects and stays connected this might also affect the
warranty. <br>
</div>
<div>Jerry <br>
</div>
<div>NABCEP PV inspector <br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jul 19, 2020 at 9:02
AM Hilton Dier III <<a href="mailto:hiltondier@gmail.com" target="_blank" rel="noreferrer">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">Greetings,
Wrenches,</font></p>
<p><font face="Times New Roman, Times, serif">I have an
off-grid client who has been reading the buzz about the
Tesla Powerwall 2.0. I have been reading the data sheets
and manual for it and it appears to be AC coupled only.
There was talk of a DC input version, but apparently
that fell by the wayside. I try to be agnostic about
technology, and I'd be willing to subcontract a
Tesla-approved installer if, in fact, this was the best
solution.</font></p>
<p><font face="Times New Roman, Times, serif">Does anybody
have experience using the Powerwall 2.0 in an off grid
PV system? Is it AC coupled only? Can it take generator
power without barfing? What is the lead time on these?<br>
</font></p>
<p><font face="Times New Roman, Times, serif">Many Thanks,</font></p>
<p><font face="Times New Roman, Times, serif">Hilton</font><br>
</p>
<pre cols="72">--
Hilton Dier III
Missisquoi River Hydro
Renewable Energy Design
</pre>
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