SW4024 Battery Charging Question [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Jeff,
Did you measure the peak to peak ac voltage from the genny while 
under that 110A charging load WITH the batteries at 29-30V?
Bob-O

>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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