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<p>I haven't had problems with contactors failing. I suspect that a lot of the problems on battery systems happen when contactors are controlled at battery voltage.</p>
<p>The nominal voltage of the system is not what the coil will see. A 48 VDC coil might experience 63 VDC. A resistor needs to be put in series with the coil to prevent over voltage. It's value needs to be calculated so that it will function, within tolerance, at both the maximum high and minimum low voltages. </p>
<p>A 240 V AC contactor coil, on the output of the generator, is quite reliable. The voltage it sees is within tolerance and the coil is generally not activated for extended periods (days or weeks or even years at a time).</p>
<p>Drake</p>
<p><br /></p>
<p>Drake Chamberlin</p>
<p>Athens Electric LLC</p>
<p>Ohio Electrical Contractor’s License 44810</p>
<p>CO Master Electrician’s License 4526</p>
<p>NABCEP Certified PV Installation Professional</p>
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<p id="reply-intro">On 2022-10-12 07:42, Kirk Herander via RE-wrenches wrote:</p>
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<div dir="ltr">You are correct on this.
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<div>The failure of any control hardware, IO's / relays / contactor logic along the way from generator sense to PV contactor should result in the coupled grid-tie PV inverter disconnected. Which means the contactor at the PV inverter should be energized "closed" (so PV AC connected normally open) under normal operation (genny off, PV on).</div>
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<div>Wired as such, It can be done with off the shelf components, and remotely by adding some <a href="http://controlbyweb.com" target="_blank" rel="noopener noreferrer">controlbyweb.com</a> controllers.</div>
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<div class="v1gmail_attr" dir="ltr">On Tue, Oct 11, 2022 at 7:49 PM Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:</div>
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<div dir="auto">I'm not a fan of this strategy because it is not failsafe. Contactors fail. When the coil fails to open the contactor, you will have the PV AC coupled with the generator If he normally closed contactor is used in this manner.
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<div dir="auto">I think the question needs to be the converse: How do you turn the PV on remotely only when the generator is not running.</div>
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<div dir="auto">Jason Szumlanski</div>
<div dir="auto">Florida Solar Design Group <br />
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<div class="v1gmail_attr" dir="ltr">On Tue, Oct 11, 2022, 2:45 PM Maverick Brown via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:</div>
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<div dir="auto">I'll usually use a 60 amp contactor with 240Vac coil.
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<div>The generator powers the coil and opens the Normally Closed contacts disconnecting the grid tie inverter. <br /><br />
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<div>Maverick Brown<br />Off-Grid Solar Commander since 2006<br /><strong>Maverick Solar Enterprises, Inc.</strong></div>
<div><strong> • Solar Commander Remote Power</strong></div>
<div><strong> • SunFlow Systems Cathodic Protection <br /></strong><a href="mailto:maverick@mavericksolar.com" rel="noreferrer">maverick@mavericksolar.com</a><br />512-460-9825</div>
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<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">On Oct 11, 2022, at 11:26 AM, Kirk Herander via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:<br /><br /></blockquote>
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<div dir="ltr">Hi,
<div dir="auto">I'm looking for suggestions on a remote control 60 amp contactor. It can either be true wireless or send a signal down an AC power line to open / close contact at the other end.</div>
<div dir="auto"> </div>
<div dir="auto">I'm trying to figure out a non-wired way to turn an AC coupled inverter off when the generator is running, as advised by outback and others.</div>
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<div dir="auto">All suggestions welcome thank you.</div>
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