Larry,
Let me learn from your experience.
P1, P2 and P14 - so you're referring to a 2025, not a 2020.
Volts: generally about one volt below the bulk setpoint (24V
systems) if the battery is in an unregulated thermal environment,
such as outside. This is so that in late summer, when the
batteries are their warmest, the charge controller still gets the
voltage above the TM's voltage setpoint after hot-weather
temperature compensation. Your thoughts?
Amps: generally set to about 2 to 2.5% of C/20 capacity. Typically
we exempt this in systems with undersized arrays. If the array can
barely achieve a C/40 rate, or if there is a big base load,
there's no point. Your thoughts?
P14: Charged minimum time setting: I'm curious what you set this
to. Especially when we set long absorption times, we set this to a
minimum, preferring to have the meter reach charged parameters and
reset itself regularly. Once more, your thoughts?
Thanks,
Allan
Allan Sindelar
al...@positiveenergysolar.com
NABCEP Certified PV
Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder, Positive Energy, Inc.
A
Certified B CorporationTM
3209
Richards Lane
Santa Fe, New Mexico 87507
505 424-1112 office 780-2738 cell
www.positiveenergysolar.com
On 12/20/2013 10:16 AM, Larry Crutcher, Starlight Solar Power
Systems wrote:
Bill,
This sounds like an ideal customer for AGM or GEL batteries.
Far more efficient and no maintenance required. One thing for
sure, I would check the programming of the Trimetric. You can
undercharge a battery and never know it if the configuration is
not done properly. Make sure to calculate and use P1, P2 and P14
to determine SoC.
Larry
Tump, Larry, Tom, Ray, Steve...........
First off this pack is a 2.3 hour round trip
drive from here, it's winter so most of the charging would
be her AC genny, the customer is in her 80's. She has
been recording SG's but I discovered she would take them
without regard to battery SOC reflected in her Trimeteric,
so they are useless. I did not check SG's while I was
there though I started the generator soon after I arrived
to try and do just that, but it was taking too long to
get to even just 28 volts much less some fully charged
voltage for a couple hours.
From all your responses, my sense is to install
a new pack. Part of me loves the challenge of trying
to"save" a pack that's on the edge of a (sulfated) cliff.
However, she is not capable of some of the tasks required
those times when I'm not there (watering cells, adjusting
voltage settings according to SG response to long charge
times, monitoring temps to prevent a catastrophe, etc)
This could evolve over the course of what would easily be
days, probably weeks of culling/moving batts around in the
pack, swapping cables, adjusting set points, swearing.
The cost to benefit ratio probably doesn't add up.
Thanks for slapping me upside the head on this
one.
Bill
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