[RE-wrenches] 4 ways to keep a battery for a long time
frenergy
frenergy at psln.com
Thu Dec 17 07:50:51 PST 2015
I'm experimenting with a panel I built myself that is series'ed and
paralleled to produce a Voc of ~3.3 volts and ~10-12 amps which can be
alligator clipped to slacker 2V cells, leads running outside to a sunny
locale. It's certainly not the quickest/best solution but worth a try
in some instances and doesn't burn up many gallons of fuel cooking an
entire pack to save a couple slackers. Its pretty easy to find PV cells
and the rest of it to make your own...and it was kinda fun.
Bill
On 12/17/2015 3:59 AM, Chris Mason wrote:
> I have a customer that has had AGM batteries in the Caribbean for many
> years without any sign of capacity loss, but...they air condition (?)
> the room they are in, and they do not use any discharge, they are
> purely setup as a UPS style system. Unless the power fails, all the
> power is exported, and they use grid power.
> When using AGM as an offgrid solar system, they last about three years
> here.
>
> On Wed, Dec 16, 2015 at 9:44 PM, jay <jay.peltz at gmail.com
> <mailto:jay.peltz at gmail.com>> wrote:
>
> HI Luke,
>
> Without knowing what the charging parameters its really hard to
> know whats going on.
>
> And this false issue with life span is years really gets me.
> Batteries are measured in cycle life, period, So to say a IND
> battery will get 15 to 20 years is bunk.
> It’ll get the cycles based on DOD, if its charged correctly,
> watered and the sun is in a good phase and, and and,
>
> I’ve got a guy who’s worn out his Hup’s in around 5-6 years.
> But how would any other but an IND battery worked with that hard
> of a life, yikes, L-16’s would have been a set a year.
>
> But I’m guessing his 11 year old batteries could be quite done.
> And he is caught in the perfect bind.
> Do you spend money on replacing some of the cells?
> If it was my client, I’d say no, he’d be throwing good money after
> bad.
>
> jay
>
> peltz power
>
>
>
>
> > On Dec 16, 2015, at 12:50 PM, Dana <dana at solarwork.com
> <mailto:dana at solarwork.com>> wrote:
> >
> > We recommend an EQ when there is a 0.02 SG differential on any
> one cell to the rest of the pack, use a refractometer for SG
> readings, install watering systems with a electrolyte port or
> water the battery bank ourselves, & do not do systems without a
> charging power backup.
> >
> >
> ----------------------------------------------------------------------------
> > Dana Orzel
> > Great Solar Works, Inc - NABCEP # 051112-136
> > E - dana at solarwork.com <mailto:dana at solarwork.com> - Web -
> solarwork.com <http://solarwork.com>
> > O - 970.626.5253 <tel:970.626.5253> C - 208.721.7003
> <tel:208.721.7003>
> > "Responsible Technologies for Responsible People since 1988"
> > Please consider the environment before printing this email.
> >
> >
> >
> > -----Original Message-----
> > From: RE-wrenches
> [mailto:re-wrenches-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>] On Behalf Of Dave
> > Sent: Wednesday, December 16, 2015 10:23 AM
> > To: 'RE-wrenches'
> > Subject: Re: [RE-wrenches] HuP Conundrum
> >
> > Luke,
> >
> > Contac HUP for specific advice. You've probably already done that?
> >
> > What comes to mind:
> > Since you have two series strings, run the house on one string
> of all good cells.
> >
> > Pull out the weak cells and charge them as per HUP's advice.
> >
> > I'm guessing that this problem has happened because the
> homeowner did not properly charge the batteries.
> > Homeowner most likely did not use a hydrometer upon EQ'ng the cells.
> > Homeowner thought the cells were fully charged and equal but
> obviously they were not.
> > Record keeping, log books etc.. for people caring for expensive
> batteries are well worth the effort.
> >
> > David Palumbo
> > Independent Power LLC
> > 462 Solar Way Drive
> > Hyde Park, VT 05655
> > 802-371-8678 <tel:802-371-8678> cell
> > 802-888-4917 <tel:802-888-4917> home
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: RE-wrenches
> [mailto:re-wrenches-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>] On
> > Behalf Of Luke Christy
> > Sent: Wednesday, December 16, 2015 12:01 PM
> > To: RE-wrenches
> > Subject: [RE-wrenches] HuP Conundrum
> >
> > Hi Friends,
> >
> > With all of the battery threads going on right now I figured it
> would be a
> > good time to start another one.
> >
> > I have a customer with a large off-grid system who has just
> started having
> > trouble with a bank of HuP batteries. This system is 48V with 8x 12V
> > 6-85F-27S batteries in two series strings. Charging is supplied
> by around 10
> > kW of PV.
> >
> > I didn't install the system and the customer has always taken
> care of the
> > maintenance and watering himself. He has seemingly been pretty
> diligent
> > about taking care of things, including equalizing on a regular
> basis.
> > However, recently he started having voltage problems and when I
> made a site
> > visit to check on the batteries, I found that 3 of the 8x 12V
> batteries each
> > had a cell with SG so low it wouldn't register on my hydrometer.
> >
> > Obviously this is a problem, and owing to some complicating
> factors I'm not
> > really sure how best to address the issue.
> >
> > Replacing the entire battery bank will be unbelievably
> expensive, especially
> > given that the house is in a remote location and there is
> difficult access
> > to the battery room. To add a another factor, the house is currently
> > unoccupied while the owner tries to sell the property, so he is
> not exactly
> > eager to invest a lot of money into battery replacement.
> >
> > The batteries are only 11 years old, so they should
> theoretically have quite
> > a bit of life left in them. Perhaps those of you with more
> experience with
> > larger batteries can advise. Can the cells be resurrected with
> careful
> > charging and equalizing?
> >
> > What would you do?
> >
> > Thanks as always for opinions and advice.
> >
> > Luke Christy
> >
> > NABCEP Certified PV Installation ProfessionalT: Certification
> #031409-25
> > NABCEP Certified Solar Heating InstallerT: Certification
> #ST032611-03
> >
> >
> > Solar Gain Services, LLC
> > PO Box 531
> > Monte Vista, CO. 81144
> > SGSRenewables at Gmail.com
> > 719.588.3044 <tel:719.588.3044>
> > www.sgsrenewables.com <http://www.sgsrenewables.com>
> >
> >
> >
> >
> >
> >
> >
>
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>
> --
> Chris Mason
> NABCEP Certified Solar PV Installer™
> Solar Design Engineer
> Generac Generators Industrial technician
>
> www.cometsolar.com <http://www.cometenergysystems.com>
> 264.235.5670
> 869.662.5670
> Skype: netconcepts
>
>
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