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
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