SW Absorption Timers Awry [RE-wrenches]

[Robert Nuese]

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Hi Mike

My problem is a bit different from the one you describe. In my
case, I look at the status of the timers in the technical menu,
(I think it's no. 27), and I see that they are at random places in
their cycle from the beginning of a charging session. For
instance, both absorption time settings can be at 2 hours, but
immediately after we turn on the generator, we may find one of
the inverters claiming that it's completed 40 minutes of the
cycle, and the other claiming it's completed 1 hr 40 minutes,
when neither should have even completed 10 minutes. At this
point, the actual voltage of the batteries while charging with an
AC source doesn't have any bearing. The problem is that the
timers have been moving forward while the AC source has
been turned off - whenever the sun brings the voltage up
above a point several tenths of a volt below the inverter bulk
charging level.

Does anyone have any more clues what's going on here?
Thanks a lot for all of your suggestions and interest,
Robert Nuese


On Sep 27, 2006, at 3:55 AM, Mike Kocsmiersky wrote:

> Robert,
> Back in '99 I had a similar problem with SW inverters. At the time  
> I was
> told by Trace that the absorption timer actually starts about .2V  
> per 12V
> system before the actual set point.  Thus when I was testing my 48V  
> system
> and setting the absorption voltage level for 57.6V and a duration  
> of 10 min
> (just a test), it appeared as though there was never any bulk  
> charging.
> When the battery bank reached 57.2V the timer started, and stopped  
> before
> ever reaching 57.6V and then dropped to float voltage.  My  
> recommendation is
> to set the bulk timer to 4 hrs not 2.  The problem will be more  
> significant
> for larger battery banks and or slower charge rates, whereas there  
> will be a
> longer duration between 57.2V and 57.6V.
>
>
>
> Mike Kocsmiersky
> President
> Kosmo Solar


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