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Actually its much more cost effective to use charge controllers than
GT inverters for the PV input. Just price out a 4 Kw GT inverter
of your choice compared to a Midnite Classic for instance. It's in
the ball park of 25 cents/ watt savings, and that's not chump
change.<br>
I only use AC coupling when the GT system is already in place, and
we're adding battery backup.<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 6/6/2015 8:49 AM, Jeff Clearwater
wrote:<br>
</div>
<blockquote
cite="mid:F743DEF3-F58F-4638-9D56-BFE990CA426C@villagepowerdesign.com"
type="cite">
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<div>Hi Mark</div>
Seems a shame to spend the money on a charge control etc when
SMA has carefully provided a built in solution.
<div><br>
</div>
<div>If you do decide to go that route you'll need to install a
Shunt and set up the DC Current Sense circuit so the inverter
knows what other current is flowing to and fro the batteries. </div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Jeff</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<br>
Sent from my iPhone</div>
<div><br>
On Jun 6, 2015, at 7:23 AM, Mac Lewis <<a
moz-do-not-send="true" href="mailto:maclewis1@gmail.com">maclewis1@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div dir="ltr">Hi Mark,
<div><br>
</div>
<div>The Sunny Island has various battery protection modes
and will shutdown based on user programmable state of
charge levels. Level 2 battery protection will start the
Sunny Island every 2 hours in an attempt to get charge
into the batteries. You should set this level up at times
when energy input is likely. See page 113-114 here: <a
moz-do-not-send="true"
href="http://files.sma.de/dl/15216/SI4548-6048-US-BE-en-20.pdf">http://files.sma.de/dl/15216/SI4548-6048-US-BE-en-20.pdf</a>
If it doesn't get any charging to the batteries for 10
minutes, it will shut down and wait again.</div>
<div><br>
</div>
<div>This is an advantage of having at least some DC coupled
solar input.</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sat, Jun 6, 2015 at 7:39 AM,
Mark Frye <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:markf@berkeleysolar.com" target="_blank">markf@berkeleysolar.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi
Guys,<br>
<br>
Just wondering about how a SI/SB microgrid works. If all
the PV is connected to SB inverters, what happens if the
loads manage to drain the batteries to their low voltage
shutdown? Wouldn't the SB stop providing the AC sync so
then the SB wouldn't have anything to sync to even if
they had power available from the PV?<br>
<br>
How is this handled? It seems to me you would always
want to have some amount of PV DC coupled.<br>
<br>
Thanks,<br>
<br>
Mark Frye<br>
Berkeley Solar Electric Systems<br>
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