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 - 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, Thanks! Rebekah
On Mon, Oct 6, 2014 at 10:49 AM, Roy Butler <r...@four-winds-energy.com> wrote: > Mick, > > You are in luck! > The Classic controller can be programmed to skip up to 32 days of bulk > charging. > > Look for this in the Main menu under Charge/ Advanced/ Skip....and select > the # of days you want to skip. > > Not sure what firmware version this goes back to but the current one > (1849) has it. > > 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 www.four-winds-energy.com > > Don't miss the 11th Annual Small Wind Conference > A Gathering of Installers, Manufacturers, Dealers, & Distributors > June 15-17, 2015 in Stevens Point, Wisconsinwww.smallwindconference.com > > Although no trees were killed in the sending of this message, > a large number of electrons were terribly inconvenienced. > > > > On 10/6/2014 10:16 AM, Mick Abraham wrote: > > Greetings, Mechanics~ > > 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. > > 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. > > Possible solutions: > > (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. > > (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. > > ++++++++++++++++++++++++++++++++++++ > > Thinking ahead to my future but similar projects: > > 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. > > 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? > > OR: would AC coupling also avert this problem even if "sell to grid" is > not enabled, for the same reason cited above? > > OR: Your suggestions here, please. > > Thanks & Jolliness, Mechanix. The Wrench List is the Bomb! > > Mick Abraham, Proprietor > www.abrahamsolar.com > > Voice: 970-731-4675 > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Tel: 336.266.8800 http://o2energies.com/ Project Engineer NABCEP Certified PV Installation Professional™ 091209-85 NC Licensed Electrical Contractor This message, together with any attachments, is intended only for the named recipient(s). It may contain confidential or privileged information that may be exempt from disclosure under applicable law. If you are not the intended recipient(s), you are notified that the disclosure, dissemination, distribution, copying, storing, or other use of the contents of this message or its attachments is strictly prohibited. If you receive this message in error, or are not the named recipient(s), please notify the sender at either the email address or telephone number above and delete this email from your computer. Thank you.
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