so beautiful by the moonlight?! [RE-wrenches]

[Mangelsdorf, Marco]

All,
 
OK, I gotta get a definitive answer to this one that has been plaguing me for a while.  All you out there who have experience with a-Si, Uni-Solar and otherwise, has anyone actually seen the array put out measurable power from moonlight?  I had a guy on friday tell me that he had seen 5 amps from a 20 amp a-Si array under that cold hearted orb that rules the night.  If true I'm going to have to start saying nice things about my local Uni-Solar competitor.
 
marco
ProVision Technologies, Inc.
Hilo, Hawai'i
www.provisiontechnologies.com

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From: Jeff Yago <jryago at earthlink.net>
Subject: RE: SW4024 Battery Charging Question [RE-wrenches]
Date: Mon, 24 Jun 2002 10:07:08 -0400
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We recently did a full instrumentation check on an off grid remote
solar/generator/battery system that uses one Trace SW4024 inverter.  House
electrical loads are very small and no large AC surge loads like pumps or
HVAC equipment.  Anyway, the system has worked great for three years, but
owner was never able to do an equalize charge on the sixteen (16) L-16
batteries.

He could never could get the "equalize" mode (generator menu) to work as the
generator would shut down as soon as he switched to equalize(yes, we know
about switching out of auto first and how to set up for equalize charge
later), so we started the generator manually and then switched to equalize
charge.  Charging started ok at about 110 amps at 29 to 30 volts.  After one
and one half hours, the inverter DC charging amps would drop to zero amps
and the inverter would start using battery amps for about 5 seconds, then
the charging mode would ramp back up to the 110 amps charging level.  This
10 second cycle would repeat every 2 minutes until the 2 hour bulk setpoint
was reached, then it switched to float mode charging.

The battery bank was fairly large and in good condition, and all cells were
close in state of charge.  I don't see why the inverter would be "hunting"
or testing battery condition as the battery was easily taking the full bulk
charge with very little temperature rise.

Anybody know what's going on ?

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