When the return amps are set to 0, that typically defeats that function. Howie
On Tue, Sep 11, 2018, 10:07 PM Dana <[email protected]> wrote: > Return amps at 0 is physically impossible I think. The lowest Return amps > I have ever seen acknowledged by a charge controller on a 24-volt set was > 3-4 amps on a new set of batteries. Older sets 6-8 amps. > > I was trying to see how low you could go before it would stop Bulk. > > 29.8 for 6 hours? was cooking them plates& boiling off electrolyte. These > batteries must have been so hot. > > To Float my 48-volt HUP set takes about 250-300 watts with no load. > 5.21-6.25 amps. > > > > > ---------------------------------------------------------------------------- > > Dana Orzel Great Solar Works, Inc. > > *C - 208.721.7003 [email protected] > <[email protected]>* > > Idaho Contractor - # 028765 Idaho PV # 028374 > > NABCEP # 051112-136 www.solarwork.biz > > *"Responsible Technologies for Responsible People since 1988" * > > *P* Please consider the environment before printing this email. > > > > > > *From:* RE-wrenches <[email protected]> *On > Behalf Of *Mac Lewis > *Sent:* Tuesday, September 11, 2018 6:44 PM > *To:* RE-wrenches <[email protected]> > *Subject:* [RE-wrenches] Trojan L16RE-2V set-points > > > > Hello wrenches, > > > > I inspected a system that another company had installed. It had single > string of 12 x Trojan L16RE-2V batteries about 2 years old. They had > experienced a battery melt-down. It looks as though the meltdown had > occurred internally, not from a bad connection. > > > > The system was dual stack Outback VFXR-3524A inverters (to be precise one > was a sealed unit). The set-points were as follows: > > Absorb Voltage was 29.8V > > Absorb Time was 6.0 hours > > Float Voltage was 27.0V > > Rebulk Voltage was 27.0V > > End Amps was 0A > > > > These settings extended similarly to 2 x FM80 charge controllers. > > > > I was able to jumper the melted battery and get her power in 15 minutes. > Her installer had left her without power for 2 weeks. My clients will kill > me if that happened! > > > > Anyway, I believe these set-points are way out of whack and too > aggressive. The voltage is OK (Trojan recommends ~29.6V for this) but the > Absorb time seems way too long, Rebulk is too high and end amps isn't > helping. However, Im not finding a definitive article from Trojan that > describes typical Absorb times or even how to adjust towards a good Absorb > Time, based on specific gravity measurements or amperage absorption. > > > > My diagnosis is that these batteries have been cooked over the past 2 > years. In the electrolyte, there is noticeable "floaties". The client > said that the original installer had accused her of not using distilled > water, but I don't believe that would cause her symptoms. I believe the > floaties are plate material. > > > > I'd be interested in wrenches opinions familiar with these batteries if > these are appropriate settings for a low energy user. I will attempt to > get through to Trojan as well. > > > > Thanks in advance > > > > > > > -- > > > > > > > > Mac Lewis > > "Yo solo sé que no sé nada." *-Sócrates* > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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