Seems to me that you are on the edge for that size battery in winter. If the inverter is going to be on, converters are kind of nutty to me. I could see having one 24V for the freezer but... I only use Concorde AGM's when I have to. Is there an AH counter or Batt Mon? Good Luck
Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail [email protected] text 209 813 0060 > Answers to questions: > > > > The batteries are Discover EVL16A-A batteries. A single string of 8: 390AH > @48V nominal. We had one fail last year, showing a significantly raised > internal resistance when tested under a load then under charge. There is > another one showing signs of weakness, but currently under a 30A draw it > is only 0.12V lower than the highest battery in the mix, and 0.05V from > the average battery voltage. Readings were: 6.0, 5.88, 6.0, 5.93, 5.92, > 5.91, 5.93, 5.94 using a 1500W space heater as a constant load during the > test. > > > > There are more loads than just networking and security that the client > just recently disclosed. Gotta love the added loads to the design. There > is a satellite DVR, 2x4 camera webcam systems, cell modem, simplisafe > security system, chest freezer, 4 wifi range extenders to serve the less > reliable security camera system, and 26W LED dusk-dawn light. I have > already talked to them about thinking hard on what items can be removed > for the winter at least (DVR is going away, and one of the camera systems > too, likely the one requiring the wifi range extenders). All other seasons > the system is fine. > > > > As for the DC converter(s) we would get a voltage specific converter for > any unique voltages, depending on the # of unique items, we would likely > abandon that approach if it got to bee too complicated. But thank you to > all that provided guidance there. The meanwell units seemed to have the > right specs to do the job if we go that route. We would also install them > using a LVD of some sort, set somewhere above the standard low voltage > cutoff of the rest of the system. We would also only go this route if all > AC loads could be removed by doing this, allowing us to remove the 36w > idle draw of the Outback. > > > > With Regards, > > > > Daniel Young, > > NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90 > > > > Lead Systems Designer for: > > > > <http://www.dovetailsolar.com/> www.dovetailsolar.com > > Ph: 740-274-0139 > > > > Weâve completed nearly 400 renewable energy projects! Check out a few > in our photo gallery: > <http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric> > http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric > > This email message and attachments are intended only for the addressee. > It may contain information which is legally privileged, confidential and > exempt from disclosure. If you are not the intended recipient of this > message, you may not disclose, print, copy or disseminate this message > and/or the information contained in the message. If you have received > this message in error, please reply and notify the sender (only) and > delete this message along with any attachments. Unauthorized interception > of this email is a violation of criminal laws and laws covering electronic > communications privacy matters. > > > > From: RE-wrenches [mailto:[email protected]] On > Behalf Of Starlight Solar Power Systems > Sent: Tuesday, January 16, 2018 11:08 AM > To: RE-wrenches <[email protected]> > Subject: Re: [RE-wrenches] Off grid DC Loads: DC Converter > > > > I too would like to know the make and model of batteries that are loosing > capacity. In the past 5 years we have experienced abnormally high failures > from 2 brands. > > > > Larry > > On Jan 15, 2018, at 2:00 PM, Jay <[email protected] > <mailto:[email protected]> > wrote: > > > > Can you tell us: > > > > Battery make,model and size? > > > > Jay > > Peltz power. > > > On Jan 15, 2018, at 12:32 PM, Daniel Young < > <mailto:[email protected]> [email protected]> wrote: > > Hello Wrenches, > > > > I have a client that is running into an issue with his off grid system. > The system is 3yrs old and they are starting to notice their AGM battery > bank is loosing capacity, in reality they are noticing the generator is > triggering more often. They want to try to lower the frequency of the > generator triggering if possible. > > > > The system is not occupied during much of the winter (unconditioned, which > further hurts the battery bank capacity), but the client has a security > system with a cell modem installed and always on. This fortunately allows > Optics-RE access, but unfortunately based on the FNDC shunt readings, is > pulling a consistent 150w from the battery bank. Currently the network and > security equipment is powered from standard wall-warts running on AC. > > > > Iâd like to help the client extend the time between generator cycles by > taking the network loads and powering them directly from the battery bank > (the loads are all 12Vdc). Does anyone have any recommendations for a > decent quality DC_DC converter that would be applicable? Given inverter > losses and the efficiency of the typical wall-wart, Iâd expect the > running loads to be closer to 80-100w rather than the 150w we see now. The > intent is to then take the inverter into search mode, or even switch it > off, to remove the tare losses there, and also to take all the wasted > power from the standard wall-warts and go to a single, more efficient dc > power supply. > > > > Any recommendations on a good DC_DC converter are appreciated. > > > > With Regards, > > > > Daniel Young, > > NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90 > > Dovetail Solar and Wind > > > > __________________________ > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: <mailto:[email protected]> > [email protected] > > Change listserver email address & settings: > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > <http://www.mail-archive.com/[email protected]/maillist.html> > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > <http://www.re-wrenches.org/etiquette.htm> > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > <http://www.members.re-wrenches.org/> www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail [email protected] text 209 813 0060 _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
