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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>
<p> <br>
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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>
</div>
<blockquote type="cite"
cite="mid:20181008220322.B75F41071B1@pdx1-mailman03.dreamhost.com">
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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>
<br>
<br>
<br>
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