[RE-wrenches] High End battery

[Mac Lewis]

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 <chris at 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
>
> chris at solarwindworks.com
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-bounces at 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*
>
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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