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Yes, we're definitely planning a battery based inverter. The real
trouble is when the generator is charging, its AC power passes
through to the loads and hence to the Enphase inverters. <br>
Also I agree with the other poster about Outback being more cost
effective. I just took a look at their Remote Operated Circuit
Breaker (ROCB) and this looks like a good option.<br>
I've done dump loads before, and never found that to be an elegant
solution. Any other options I should be looking at?<br>
<br>
Thanks,<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
<div class="moz-cite-prefix">On 8/17/2015 8:36 PM, Jerry Shafer
wrote:<br>
</div>
<blockquote
cite="mid:CAMUFgmUJ3w01zizY3-CpRM+Tu+a1_zX0LySsLvkLhaNmda455A@mail.gmail.com"
type="cite">
<p dir="ltr">I cant see this working well without some battery
based inverter<br>
Jerry</p>
<div class="gmail_quote">On Aug 17, 2015 10:10 AM, "Ray Walters"
<<a moz-do-not-send="true" href="mailto:ray@solarray.com">ray@solarray.com</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">HI Esteemed
Wrenches:<br>
<br>
I am consulting on a system I have never seen, that consists
of a 6.7Kw Enphase roof mounted system, and 2 backup
generators. Each generator has an automatic 200 amp transfer
switch to back up its own 200 amp panel. Both 200 amp panels
are fed by a 400 amp service from the grid.<br>
The Enphase PV backfeeds a subpanel in another building which
then is fed by a 2 pole 60 amp breaker in one of the 200 amp
panels.<br>
Currently they are having issues with the generators kicking
out because of the Enphase inverters. That part I understand:
you can't backfeed a generator, or its voltage regulation
freaks out.<br>
<br>
Now we get to the fun part: they want to create a third
critical load subpanel with loads selected from both 200 amp
panels to be powered by batteries and an inverter.<br>
I am considering the Sunny Island since it makes the most
sense with its ability to signal the Enphase inverters to shut
off when the batteries are full. I also see this as a partial
solution to the generator issue, since normally the Enphase
will be connected to the output side of the Sunny Island.
However, when the generator is used to charge, we will be back
to directly coupling the generator output to the Enphase.<br>
<br>
Here are some possible solutions I'm considering:<br>
1) Use a separate charger for the generator so that it will
only feed DC to the batteries, and not be AC coupled.<br>
2) convert the PV back to DC with charge controllers, but that
would involve ditching and adding another conduit run between
buildings.<br>
3) Put the Enphase PV on a relay that would disconnect the PV
when charging with the generator.<br>
4) Something I haven't thought of that one of you clever folks
can suggest......<br>
<br>
As always, thanks in advance for all you responses,<br>
<br>
-- <br>
R.Ray Walters<br>
CTO, Solarray, Inc<br>
Nabcep Certified PV Installer,<br>
Licensed Master Electrician<br>
Solar Design Engineer<br>
<a moz-do-not-send="true" href="tel:303%20505-8760"
value="+13035058760" target="_blank">303 505-8760</a><br>
<br>
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