Unfortunately I'm seeing premature failures of the 2 v models even
more. You have paralleled cells in each battery, and it can be
difficult to even identify the failures. I found the infared camera to
be invaluable, as you can see the shorted cell clearly in a thermal image.
Ray Walters
Remote Solar
303 505-8760
On 9/12/18 9:53 AM, Drake wrote:
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.Â
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.Â
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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