[RE-wrenches] Trojan L16RE-2V set-points

[Howie Michaelson]

When the return amps are set to 0, that typically defeats that function.
Howie

On Tue, Sep 11, 2018, 10:07 PM Dana <dana at solarwork.com> 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                       dana at solarwork.com
> <dana at solarwork.com>*
>
> Idaho Contractor - # 028765         Idaho PV # 028374
>
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>
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>
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> *On
> Behalf Of *Mac Lewis
> *Sent:* Tuesday, September 11, 2018 6:44 PM
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *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*
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