Daniel, While the Meanwell has been a good choice for me at times, I have also run across some of their converters which have an active cooling fan which is steady on (no thermal control). This leaves a steady phantom load as well as a fairly loud background drone. And their tech support did not accurately portray these specs to me when I asked. Howie
On Tue, Jan 16, 2018 at 3:06 PM, Daniel Young <dyo...@dovetailsolar.com> wrote: > 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: > > [image: Dovetail 2013 cmyk 300dpi.jpg] > > *www.dovetailsolar.com* <http://www.dovetailsolar.com/> > > Ph: 740-274-0139 <(740)%20274-0139> > > > > We’ve 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:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *Starlight Solar Power Systems > *Sent:* Tuesday, January 16, 2018 11:08 AM > *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> > *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 <jay.pe...@gmail.com> wrote: > > > > Can you tell us: > > > > Battery make,model and size? > > > > Jay > > Peltz power. > > > On Jan 15, 2018, at 12:32 PM, Daniel Young <dyo...@dovetailsolar.com> > 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. > > > > I’d 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, I’d 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: 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 > > >
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