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The Blue Sky should still work as long as he switches PV positive
and negative. However, I like the idea of charging just the 24 volt
system and feeding AC to the Outbacks to charge the 48 volt bank. A
little more loss but mush easier to implement. You could easily
control when AC is fed to the 48 volt system based on voltage of the
24 volt battery.<br>
<pre class="moz-signature" cols="72">Larry</pre>
<div class="moz-cite-prefix">On 3/25/15 10:24 AM, Ray Walters wrote:<br>
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<blockquote cite="mid:5512EF64.90605@solarray.com" type="cite">
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Hi Jeremy;<br>
<br>
I usually would combine both buildings all into one system, KISS
principle, and also less cost. Later when those batteries die,
replace with a properly sized bank. I also wouldn't be building a
new system around an SW4024, those are getting really dated. Great
inverter, but they don't last forever. They have excellent resell
value on Ebay for folks that need replacements in dual and quad
systems.<br>
Having said that, Jerry's idea of 2 controllers on one array
sounds like it would work, but not with Blue Sky because of the
grounding as Larry mentioned.<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 3/25/2015 10:36 AM, Larry wrote:<br>
</div>
<blockquote cite="mid:5512E421.3080808@starlightsolar.com"
type="cite">
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Keep in mind that the Midnite controller has a combined PV and
bat. negative and the Blue Sky requires isolated PV and bat.
negative.<br>
<pre class="moz-signature" cols="72">Larry Crutcher
Starlight Solar Power Systems
</pre>
<div class="moz-cite-prefix">On 3/24/15 6:11 PM, Jeremy
Rodriguez wrote:<br>
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cite="mid:BAY405-EAS3299EF04E2EC8D56D4AE5BCCB0B0@phx.gbl"
type="cite">
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<div>The thought was to charge the batteries for a new
building utilizing an SW4024 with new classic controller and
new L A batteries, and once those batteries are charged send
the PV to the house system which is the 48v setup with dual
outback inverters and dual SB3048 CCs. Lead acid batteries
as well. 3 years old </div>
<div>I've never had this come up in 16 years!</div>
<div><br>
<br>
Jeremy Rodriguez
<div>All Solar, Inc.
<div>1463 M<br>
<div>Penrose Colorado 81240</div>
<div><br>
</div>
<div>Sent by Jeremy's iPhone. Sorry for typos and
shorthand!</div>
</div>
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<div><br>
On Mar 24, 2015, at 5:31 PM, "Ray Walters" <<a
moz-do-not-send="true" href="mailto:ray@solarray.com">ray@solarray.com</a>>
wrote:<br>
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What's the reasoning behind two different battery banks at
different voltages? What is the other equipment involved:
batteries type, age, inverters, etc.?<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 3/24/2015 5:07 PM, Jeremy
Rodriguez wrote:<br>
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cite="mid:BAY180-W71FA95B8A87E7477EB3A9ACB0A0@phx.gbl"
type="cite">
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<div dir="ltr">It would be 2kw of PV<br>
<br>
Jeremy<br>
All Solar<br>
Penrose, CO<br>
<br>
<div>
<hr id="stopSpelling">Date: Tue, 24 Mar 2015
12:17:20 -1000<br>
From: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:jerrysgarage01@gmail.com">jerrysgarage01@gmail.com</a><br>
To: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
Subject: Re: [RE-wrenches] Charging Multiple Battery
Banks<br>
<br>
<div dir="ltr">
<div>How big of a system are you looking at as
some of the smaller charge controllers are auto
sensing<br>
</div>
Jerry<br>
</div>
<div class="ecxgmail_extra"><br>
<div class="ecxgmail_quote">On Tue, Mar 24, 2015
at 12:11 PM, Jeremy Rodriguez <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:allsolarjeremy@msn.com"
target="_blank">allsolarjeremy@msn.com</a>></span>
wrote:<br>
<blockquote class="ecxgmail_quote"
style="border-left:1px #ccc
solid;padding-left:1ex;">
<div>
<div dir="ltr">Wrenches,<br>
I have a client that wants to charge a 24v
battery bank and a 48v bank with the same
array. Different charge controllers, with
some type of relay is what I was thinking,
and using the controller's aux. 12v output
for the relay control. <br>
The primary battery to be charged would be
the 24v bank, then once it is fully
charged, divert the pv to the secondary
controller at the 48v bank.<br>
<br>
Any comments or recommendations on this
would be helpful.<span class="ecxHOEnZb"><font
color="#888888"><br>
<br>
Jeremy Rodriguez<br>
All Solar Inc. <br>
Penrose, CO<br>
</font></span></div>
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