Something else to consider is that many of the modern LFP batteries use a relatively large amount of power just to keep the internal BMS/contactor(s) energized, independent of whether the battery is being charged/discharged. For example, I believe the Fortress eFlex 5.4's use on the order of 12-20 W continuously, *each*. A stack of four generates a significant amount of heat from this alone!
Cheers, Kirk Bailey k...@abundantsolar.com On Sun, Nov 5, 2023 at 12:28 PM Howie Michaelson via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Daryl, > Being in Vermont and dealing with lots of off-grid, occasional use > systems, I'm definitely interested in others' experience with cold weather > installations. > Howie Michaelson > Sun Catcher > > > > On Sun, Nov 5, 2023 at 3:03 PM Darryl Thayer via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Great site, Allan, but many facts still need to be included. Was there a >> discharge or charge going on? How much power was being drawn by the >> heaters? If this is for a standalone system, energy consumption is very >> important. What is the lower temperature cell discharge limit of Blue >> Planet? What concern was taken for the summer and overheating? What are >> the blue planet-specific heat and weight of the batteries? More questions, >> but I doubt if anyone else is interested. Thank you. >> >> On Thu, Oct 26, 2023 at 11:49 AM Sindelar Solar via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> You might be able to get some ideas from this. It's worked well for me >>> on one job. >>> Allan >>> >>> On 10/25/2023 2:24 PM, Dana Orzel via RE-wrenches wrote: >>> >>> I know we have had this run thru before & wanted to see if any new >>> options for heating LI batteries. >>> >>> >>> >>> I have an 8 pack of Homegrid LI batteries that is off grid with Radian >>> 8048a. Originally, they were not going to be there for the winter, now it >>> is a possibility they may visit. Plenty of solar 6KW+, hopefully generator >>> back up waiting on delivery currently. >>> >>> Currently located in main room high ceilings/log cabin. >>> >>> Looking at creating an insulated closet & using terrarium heaters >>> controlled if over 51volt heater on AC from inverter. Or just boxing in >>> with 3-4” of blue board Styrofoam…. >>> >>> >>> >>> Has anyone else done something similar? >>> >>> Has anyone done this & it did not work? >>> >>> >>> >>> Thought & suggestions….. >>> >>> >>> >>> >>> >>> _________________________________________________________ >>> >>> Dana Orzel GREAT SOLAR WORKS! >>> >>> C – 208.721.7003 E – d...@solarwork.com >>> >>> W - www. greatsolarworks.com www.solarwork.com >>> >>> *“Responsible Technologies for Responsible People since 1988!”* >>> >>> >>> >>> _______________________________________________ >>> 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 >>> >>> >>> -- >>> >>> *Allan Sindelar* >>> al...@sindelarsolar.com >>> RETIRED >>> >>> >>> _______________________________________________ >>> 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. 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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