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<p><font face="Verdana">I think something on the order <font
face="Verdana">of 90+% lig<font face="Verdana">htnin<font
face="Verdana">g strikes come from the utili<font
face="Verdana">ty feed, not the dc side. That has to be
ignored if in a high str<font face="Verdana">ike area or<font
face="Verdana"> grid is<font face="Verdana">olated.
</font></font></font></font></font></font></font></font><br>
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<div class="moz-cite-prefix">On 10/8/2018 10:37 PM, Ray wrote:<br>
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<p>I believe you can use the SPD 300 AC on 2 strings, if PV neg is
grounded. You would connect the green to ground (or PV neg) and
then connect the red to one string pos, and connect the black to
the other string pos. This would be limited to 300 v also. I
haven't tried that exact configuration, but I have used the 300
AC to protect both the AC in and AC out on 120 vac inverters. I
also believe you can use a 600 DC version, and wire as I
mentioned, but the LEDs won't light. If you are using ungrounded
inverters, then I think you would need an SPD for each string in
order to protect both the pos and neg of each string, like
you've been doing.</p>
<p>Maybe someone from Midnite can clarify this.</p>
<p>As far as it being worth it, I haven't had lightning related
damage since I started using the Midnite SPDs, and I used to
have system damage every year. If you are not in lightning
country, or the install is in a low spot with less likelihood of
taking a hit, you might be able to skimp. But for some of these
off grid ridge top installs, I consider it a must. Some times I
don't install one on the gen circuit, if its really close.<br>
</p>
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<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 10/8/18 4:03 PM, Drake wrote:<br>
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Hello Wrenches,<br>
<br>
Do you use surge arrestors with multi MPPT input string
inverters? Do you put a separate arrestor on each MPPT input? I
find it sort of pricey using a Midnite Solar arrestor on each
string, but have been doing that. Is there a less expensive
approach that is effective? <br>
<br>
I believe the Midnite units are the best. Are they worth the
expense?<br>
<br>
Thank you,<br>
<br>
Drake<br>
<br>
<br>
<a name="_MailAutoSig" moz-do-not-send="true"></a>Drake
Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328<br>
</i><a href="http://athens-electric.com/" moz-do-not-send="true">http://athens-electric.com/</a>
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<font size="-1"> Christopher Warfel, PE<br>
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