I agree with the comments that followed on this
thread, and would also like to add that Trojan
L-16 batteries have a high rate of premature
failure. Possibly the 2 V cells are better, but
the 6 V cells seem very prone to dying early.
Trojan batteries were robust in past decades, but
seem exceedingly fragile now.
At 08:44 PM 9/11/2018, you wrote:
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. Â
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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