<div dir="ltr">Hi Drake,<div><br></div><div>I think you can put a power diode in parallel to the gt inverter that can conduct that inductive current if you need to. However, I think BoB is correct, there should just be induction of the wiring itself for most grid-tied inverter. The relay engineer recommended this diode for a DC load break application I recently had, so I assume AC would be the same.</div>
<div><br></div><div>Thanks</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jun 16, 2014 at 9:11 AM, <a href="mailto:boB@midnitesolar.com">boB@midnitesolar.com</a> <span dir="ltr"><<a href="mailto:boB@midnitesolar.com" target="_blank">boB@midnitesolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div><br>
Since grid-tie inverters sell back with a power factor of 1, the
load ~should~ be entirely resistive and<br>
not inductive or capacitive so a appropriately rated relay
contacts ~should~ be fine.<br>
<br>
Except maybe if the inverter is designed to supply VARs like the
last Solar-Pro magazine talks about.<br>
(haven't actually read that article yet but I assume that's what
it is about)<br>
<br>
Of course, others may have different experiences so I would listen
to them.<br>
<br>
I prefer to use a somewhat over-rated relay.<span class="HOEnZb"><font color="#888888"><br>
<br>
boB</font></span><div><div class="h5"><br>
<br>
<br>
On 6/16/2014 7:05 AM, Drake wrote:<br>
</div></div></div><div><div class="h5">
<blockquote type="cite">
Hello Wrenches,<br>
<br>
Do the relays that break the current from the direct grid tie
inverters,
in AC coupled systems, need to be motor rated or can they simply
be rated
for the amperage of the inverter output? How inductive is the
current
between the two inverter systems? Will the current tend to jump
the
contacts on a non motor rated relay, or burn them out
prematurely?<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
<br>
<a name="146a53bf6fad3714__MailAutoSig"></a>Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
<a href="tel:740-448-7328" value="+17404487328" target="_blank">740-448-7328</a><br>
</i><a href="http://athens-electric.com/" target="_blank">http://athens-electric.com/</a><br>
</blockquote>
<br>
</div></div></div>
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