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 <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 <r...@solarray.com> > *To:* RE-wrenches <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
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