[RE-wrenches] FLA battery setpoints with larger arrays

[jay peltz]

agreed.
Again, maybe Steve has an view of the builder, but having it on the post is
pretty close.


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> 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 <ray at solarray.com>
> *To:* RE-wrenches <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
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