[RE-wrenches] FLA battery setpoints with larger arrays

[boB at midnitesolar.com]

On 5/22/2015 6:43 PM, jay peltz wrote:
> agreed.
> Again, maybe Steve has an view of the builder, but having it on the 
> post is pretty close.



If it's the typical flat type of BTS, wedged right between two batteries 
will give a good
average temperature of the two of them.

boB



>
>
> Maybe there is a white paper on temp sensor locations pros/cons?
>
> jay
>
>
>
>
> On Fri, May 22, 2015 at 5:08 PM, frenergy <frenergy at psln.com 
> <mailto:frenergy at psln.com>> wrote:
>
>     This is good stuff, enlightening...but begs another small? detail
>     that has obvious big ramifications. Where o where does the BTS get
>     placed to best read the actual "temperature of the battery"?  It's
>     too big to fit on many terminals especially once cabled, it's
>     certainly not very accurate when stuck to the outer case of a dual
>     cased Surrette and probably only somewhat more accurate when stuck
>     to an L-16 top. Aren't we looking for electrolyte temps?
>             Many times the BTS doesn't survive its original location
>     after a few years of battery acid. Rather than "insulated" from
>     the surface its been assigned to with 2-sided tape, it seems like
>     it should be in direct contact with that surface with a dab of
>     thermal grease between.  Or, couldn't a wrench be trusted to drill
>     a 1/4" hole in the top of a representative cell and insert an acid
>     proof sensor into the electrolyte with a formed snap-in plug
>     (rubber, silicone, nylon??) behind it on the lead, to seal it
>     where it enters the battery case?
>             Just saying, if we really need (and I think we do)
>     accurate battery temp for temp regulation and battery health, what
>     we're using now is substandard.
>     Bill
>     Feather River Solar Electric
>
>         ----- Original Message -----
>         *From:* Ray Walters <mailto:ray at solarray.com>
>         *To:* RE-wrenches <mailto:re-wrenches at lists.re-wrenches.org>
>         *Sent:* Friday, May 22, 2015 3:33 PM
>         *Subject:* Re: [RE-wrenches] FLA battery setpoints with larger
>         arrays
>
>         I thought I'd post some info on Battery Temp from a few manus:
>         HUP Solar One: do not exceed 105 F
>         Full River AGMs: max recommended operating temp 104F
>         and from Trojan:  for every 10C increase in temperature the
>         reaction rate doubles.  Thus, a month of operation at 35C is
>         equivalent to 2 months at 25C.  Heat is the enemy of ALL lead
>         acid batteries.  Even small increases in temperature will have
>         a major influence on battery life.
>         Their T105 RE battery has a max operating temperature of 113 F
>
>         I think more batteries are hitting high temperatures than we
>         may realize.  This info from Trojan that a battery at 95F
>         (35C) will only last half its rated life (at 25C) is very
>         concerning.
>         Once again, thanks Bob and Midnite for giving us a tool to
>         combat over temperature of batteries.  We always knew cold was
>         a problem, now I'm realizing heat could be just as important.
>
>         R.Ray Walters
>         CTO, Solarray, Inc
>         Nabcep Certified PV Installer,
>         Licensed Master Electrician
>         Solar De
>
> -- 
> Jay Peltz
> Peltz Power
> jay.peltz at gmail.com <mailto:jay.peltz at gmail.com>
>
>

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