Hi Wrenches, Thanks for the opinions. I am aware crawl space is not ideal for all sorts of reasons. I can't get into this cabin until late May or June and I don't remember the layout real well. Best case scenario is that we will be able to relocate the batteries. Regardless of battery location, I need a battery that is resilient, and can take minimal homeowner interaction, and cool temps through the winter. My initial thought was a set of AGMs as well. My only real concern with them is if we had a PV failure mid-winter and the batteries were sitting without a charge for 6 months, so I was looking to see if there was a chemistry that this wouldn't be a concern.
Thanks On Mon, Mar 27, 2017 at 1:13 PM, Chris Worcester <ch...@solarwindworks.com> wrote: > Hi Mac, > > I do like the Concorde SunXtender AGM batteries, first one I bought in > 2002 is still ticking, it sits in the yard built into a rolling tool case > with a ProStar-15 on a 20 watt module and an Exeltech 250 w inverter, > charging my gen set’s charging battery. (most nights here in Truckee go > well below freezing). > > I’d go to their L16 sized AGM 2V PVX-12150-HT that’s rated to 1215 Ahr’s > at the 24 hour rate. Put in two or three strings max. > > I don’t like to see batteries in tight crawl spaces though, even with > these it’s best to check the torque (70 inch pounds) on occasion, check for > corrosion ( I use a high temp lithium wheel bearing grease to slather up > the cable ends and terminals prior to installation), and be able to read > individual cell voltages and terminal temps. See if there is a better > location. > > > > Chris Worcester > > Solar Wind Works > > NABCEP Certified PV Installer > > Office 530-582-4503 <(530)%20582-4503> > > Cell 530-448-9692 <(530)%20448-9692> > > Fax 530-582-4603 <(530)%20582-4603> > > www.solarwindworks.com > > ch...@solarwindworks.com > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *Mac Lewis > *Sent:* Monday, March 27, 2017 5:53 AM > *To:* RE-wrenches > *Subject:* [RE-wrenches] High End battery > > > > Hi Wrenches, > > > > I've got a customer that has an older off-grid system with a 5 string > ~2000 Ahr (No I didn't install this) L16 battery bank that is failing. Its > a Trace SW 4024 system where the batteries are located in a > difficult-to-access crawl space where I'm sure they never got watered. > > > > We'd like to have these characteristics: > > 1. Modular (need to be able to get them to the crawl space) > > 2. Maintenance free > > 3. Able to be abused and bounce back > > 4. Compatible with an Outback MX 60 charge controller (preferably) > > 5. In case of charge controller failure, we'd like the batteries to be > able to go over the winter with no charge and not be damaged > > 6. Need about 30-40 kWh bank size > > 7. Able to withstand cool temps (operate decently at 45F) withstand near > freezing temps over winter (with no usage) > > 8. Price tag isn't a big constraint with these customers > > > > What are some batteries you might recommend? > > > > Thanks in advance > -- > > > > > > > > Mac Lewis > > "Yo solo sé que no sé nada." *-Sócrates* > > _______________________________________________ > 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 > > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
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