Hi Michael Do you know if Discover is coming out with larger Helios batteries? 30 amp hrs is pretty small.
And thanks everyone for the answers. As to the blue planet, I don’t think they need heaters. I was working on a system with one and the battery housing was darn warm, much warmer than anything else in the inverter room. Surprising actually. Jay > On Jul 21, 2022, at 10:18 PM, Michael Morningstar via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > > 1st line of defense: Agricultural seed tray heat mats w/ integral T-stat > 2nd LOD: Empire wall heater (no electronics) w/ industrial temperature > controlled relay (TCR) (similar to a thermostat) set to 38 degrees > 3rd LOD: Battery side of charge controller circuits have TCR controlled > contactors to break circuit if 1 and 2 fail > > Redundancy is key here. We learned the hard way when a system we designed > relied on a common battery powered T-stat that controlled a propane wall > heater. Brand new Energizer Lithium AA didn't last a winter. Ouch > > All of this will be moot soon. We are about to build a half dozen systems > with Discover's Helios in the next few months. Internal heaters like > Battleborns but with Discover's superior architecture and components. This is > the future. > > This is for NorCal >6K elevation installations. In colder climates I'd insist > on conditioned and supervised spaces > > > > >> On Thu, Jul 21, 2022 at 8:56 PM frenergy via RE-wrenches >> <re-wrenches@lists.re-wrenches.org> wrote: >> Jay, >> >> With the SimpliPhi's we've been installing we require a >> shed on slab, walls R-21, roof, R-38 and then the smallest propane wall >> heater (they use zero power to operate) we can find and set it at 55 >> degrees. No need for the insulated box or fretting about toasting $20K+ >> in batteries. It would be nice to find one with a thermostat that goes >> down to 45 degrees. >> >> Bill >> >> Feather River Solar Electric >> Bill Battagin, Owner >> 4291 Nelson St. >> Taylorsville, CA 95983 >> 530.284.7849 >> CA Lic 874049 >> >> On 7/21/2022 2:30 PM, jay via RE-wrenches wrote: >> > HI All, >> > >> > As I get more calls for offgrid designs with lithium batteries I”m >> > wondering what you all are doing to keep the batteries warm when it gets >> > cold. For some of you 0 F will seem mild, others super cold. >> > >> > Doing a battery box and heating that or heating the whole inverter/battery >> > shed? >> > >> > I’m definitely not looking at batteries like battle born with the built in >> > heaters. >> > >> > Simpliphi, Discover, some of the newer server rack ones ( UL listed), etc. >> > >> > >> > Thanks in advance >> > >> > Jay >> > >> > >> > _______________________________________________ >> > 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 >> > >> >> -- >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus >> >> _______________________________________________ >> 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 >> > > > -- > Michael Morningstar > > Morningstar Electric > PO Box 1494 > Mount Shasta, CA 96067 > 530-921-0560 > mjmornings...@gmail.com > > _______________________________________________ > 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 >
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