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 <frene...@psln.com
<mailto:frene...@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:r...@solarray.com>
*To:* RE-wrenches <mailto:re-wrenches@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.pe...@gmail.com <mailto:jay.pe...@gmail.com>
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