<div dir="ltr">I'm just wondering if anyone could tell me if I have programmed this right on my own off-grid cabin system with an Outback FX80 -<div>If I set the re-bulk fairly low (like 24.5 volts for a 24 volt system) I should avoid bulk/absorb charging on days when the batteries are not being cycled? There are no loads at all when I am not there, which is most of the time, <div>Thanks!</div><div>Rebekah</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 6, 2014 at 10:49 AM, Roy Butler <span dir="ltr"><<a href="mailto:roy@four-winds-energy.com" target="_blank">roy@four-winds-energy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Mick,<br>
<br>
You are in luck!<br>
The Classic controller can be programmed to skip up to 32 days of
bulk charging.<br>
<br>
Look for this in the Main menu under Charge/ Advanced/ Skip....and
select the # of days you want to skip.<br>
<br>
Not sure what firmware version this goes back to but the current
one (1849) has it.<br>
<pre cols="72">Roy Butler
NABCEP Certified Solar PV Installer®
NYSERDA eligible PV & wind installer
IREC Certified Master Trainer™ for Small Wind Installer
Four Winds Renewable Energy, LLC
8902 Route 46, Arkport, NY 14807
607-324-9747 <a href="http://www.four-winds-energy.com" target="_blank">www.four-winds-energy.com</a>
Don't miss the 11th Annual Small Wind Conference
A Gathering of Installers, Manufacturers, Dealers, & Distributors
June 15-17, 2015 in Stevens Point, Wisconsin
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Although no trees were killed in the sending of this message,
a large number of electrons were terribly inconvenienced.
</pre><div><div class="h5">
On 10/6/2014 10:16 AM, Mick Abraham wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr">Greetings, Mechanics~
<div><br>
</div>
<div>My client's (flooded lead acid) battery is in Float almost
all the time, courtesy of an XW inverter stack plus public
utility power while the system waits in standby. "Selling to
grid" is not enabled for complicated reasons, so here's the
problem.</div>
<div><br>
</div>
<div>Each day at sunup, the Midnite charge controls implement a
new 3 stage charge cycle including a lengthy absorption
interval. The batteries require frequent water additions and
there may be other deleterious effects from running a complete
bulk/absorb charge every day on a battery that's already
highly charged. </div>
<div><br>
</div>
<div>Possible solutions: <br>
</div>
<div><br>
</div>
<div>(1) We could tweak the Midnite settings for a short
absorption interval with less gassing...but if a prolonged
grid outage should develop we would wish the absorption
interval had not been shortened.</div>
<div><br>
</div>
<div>(2) Your suggestions here, please. The client would be
willing to update and/or reconfigure their Midnite software if
that would help or the client would even consider hardware
revisions. We chose the Midnite controllers in 2011 largely
because of their 250 volt input ceiling, btw. </div>
<div><br>
</div>
<div>++++++++++++++++++++++++++++++++++++</div>
<div><br>
</div>
<div>Thinking ahead to my future but similar projects:</div>
<div><br>
</div>
<div>Does any DC charge controller know that a new absorb cycle
is not needed each day provided that the battery never dropped
below Float the night before? A full cycle would still be
wanted every 30 days or so just to stir things up, so that's
almost like a 30 day equalization trigger only it would be a
bulk trigger instead.</div>
<div><br>
</div>
<div>OR: would "selling to grid" avert this problem since the
"battery backup with grid tie" type inverter is aware that the
battery never left the Float stage?</div>
<div><br>
</div>
<div>OR: would AC coupling also avert this problem even if "sell
to grid" is not enabled, for the same reason cited above?</div>
<div><br>
</div>
<div>OR: Your suggestions here, please.</div>
<div><br>
</div>
<div>Thanks & Jolliness, Mechanix. The Wrench List is the
Bomb!</div>
<div><br clear="all">
<div>Mick Abraham, Proprietor<br>
<a href="http://www.abrahamsolar.com" target="_blank">www.abrahamsolar.com</a><br>
<br>
Voice: 970-731-4675</div>
</div>
</div>
<br>
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