<div dir="auto"><div>What happens when the contactor fails? I don't trust a NC contactor that is supposed to open on 240Vac coil voltage from the generator. It's not a failsafe solution. <div dir="auto"><br></div><div dir="auto">Jason</div><div dir="auto"><br></div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 4, 2021, 3:15 PM Drake <<a href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
P.S. The contactor method is even mentioned somewhere in the Outback
literature. I've been using it for years. It is very simple and requires
no complex equipment. It will not interfere with rapid shutdown. 40 A,
240 V contactors with 240 V coils are readily available and not terribly
expensive. The 240 V output of the generator circuit provides the signal.
<br><br>
At 10:02 AM 5/4/2021, you wrote:<br>
<blockquote type="cite">Get a contactor with a 240 VAC
coil. Connect the coil wire wires to the 240 V output circuit of the
generator, so when the generator comes on, the contactor opens. Run the
current from the AC coupled Enphase inverters through the contacts from
common to N/C. <br>
<br>
---<br>
<br><br>
<br>
On 2021-05-03 10:26, Dave Tedeyan wrote:<br>
<blockquote type="cite">Hi All, <br><br>
I am planning on using a Sol-Ark for the first time for adding battery
backup to an existing system. It is Enphase, so clearly it will be AC
coupled, and there is a whole house generator. When I talked to Sol-Ark
about it, they recommended putting the generator on a time of use
schedule to not allow it to come on during the day so that we don't run
into the issue of the solar backfeeding the generator.<br>
<br>
I was wondering though if anyone has just used a contactor to cut out the
solar when the generator turns on? Something like Outback's
GS-AC-Gen-Kit, although in this case I will need something rated for just
over 30A. This seems like a better way to allow the generator to run at
any time it is needed, especially if it is a gloomy, snowy, winter
day.<br>
<br>
Cheers, <br>
Dave<br>
<br>
-- <br>
<b>Dave Tedeyan, PE<br>
</b>
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