Over the years I have *never *seen loads, no matter how small, taken off of a mid point of a battery not cause serious issues with cell balancing. Even with the use of the Vanner equalizer there were always still problems with the battery bank. So I would never do it. When I converted to a 48 volt system I installed an AC to 24VDC power supply for my ElSid circ pumps for the radiant floor. AC to DC converters like the ones from Mean-Well are pretty efficient and inexpensive. If you have larger, or motor loads, you would have to get a larger converter of course.
Brad On Thu, Jan 27, 2022 at 10:57 AM Aaron Mandelkorn <reoso...@gmail.com> wrote: > I am pushing for 48v. The main concern with doing so are how to best > continue to provide 24v power to the 23v circuits. Now I am thinking > rather than using a dc stepdown converter, I could potentially use 24v > batteries in series/parallel and power the loads directly off of the > battery. Not sure how this would throw off the electrical balance of the > battery. Thanks all. I appreciate help and direction with this. Looks > like there are a few options for me to consider. > > Aaron Mandelkorn > President / Founder > Renewable Energy Outfitters > www.reosolar.com > Off Grid Depot > www.offgridnow.com > 970-596-3744 > > On Thu, Jan 27, 2022, 11:49 AM frenergy <frene...@psln.com> wrote: > >> Aaron, >> >> Ain't nothing wrong with going to 48 volt. It sort of >> sounded like you wanted to stick with 24 volt but if they want to replace >> PVs too (which it sounded like in your original post), go 48. >> >> Bill >> >> Feather River Solar Electric >> Bill Battagin, Owner >> 4291 Nelson St. >> Taylorsville, CA 95983 >> 530.284.7849 >> CA Lic 874049 >> >> On 1/27/2022 9:09 AM, Aaron Mandelkorn wrote: >> >> All, I will do a load analysis for the 24v loads. I am looking to get >> around 800ah of LI storage at 24v. I typically use the larger 48v >> batteries from fortress. The space constraints will not allow for a wall >> full of small 50ah 24v units. I am not finding much selection of 24v 200ah+ >> options. Is sounds like most of the advice I am getting is towards not >> upgrading to 48v. >> >> Aaron Mandelkorn >> President / Founder >> Renewable Energy Outfitters >> www.reosolar.com >> Off Grid Depot >> www.offgridnow.com >> 970-596-3744 >> >> On Wed, Jan 26, 2022, 7:59 PM frenergy <frene...@psln.com> wrote: >> >>> Aaron, >>> >>> It would be helpful to know how many amps are required to >>> power the 24 volt loads and should we assume the batteries are toast or >>> nearly so? The brand of inverter? >>> >>> As Jeff said there are 24V L-ion choices. >>> >>> Bill >>> >>> Feather River Solar Electric >>> Bill Battagin, Owner >>> 4291 Nelson St. >>> Taylorsville, CA 95983 >>> 530.284.7849 >>> CA Lic 874049 >>> >>> On 1/26/2022 4:16 PM, Aaron Mandelkorn wrote: >>> >>> Wrenches, >>> >>> I have a customer with a very old 24v off grid pv system. He wants to >>> upgrade his array, inverter and battery bank. There are no options for >>> inverter/chargers over 4000 watts in 24v dc. The same goes for lithium >>> iron batteries. Everything (of higher wattage and battery capacity) seems >>> to be in 48v only now. If going to 48 volts how do I acomodate the few but >>> important 24v DC loads in the home. Is a 48v to 24v step down converter >>> the best option? What do you think? Any help would be appreciated. Thank >>> you. >>> >>> Aaron Mandelkorn >>> President / Founder >>> Renewable Energy Outfitters >>> www.reosolar.com >>> Off Grid Depot >>> www.offgridnow.com >>> 970-596-3744 >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> 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 >>> >>> There are two list archives for searching. When one doesn't work, try the >>> other:https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette:http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios:http://www.members.re-wrenches.org >>> >>> >>> >>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> >>> Virus-free. >>> www.avast.com >>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link> >>> <#m_-7383537340987691532_m_8144765557031421817_m_-2020937635624825215_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> 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 >>> >>> There are two list archives for searching. When one doesn't work, try >>> the other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> 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 >> >> There are two list archives for searching. 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