OutBack MX60 absorption time period and end amps setting [RE-wrenches]

[Christopher Freitas --- OutBack Power]

Allan Sindelar wrote:
>I suspect that the MX60 accomplishes the same result via use of a timed 
>absorption function that correlates to time spent in bulk, in order to 
>minimize absorption time when charging from a full battery, but I 
>haven't lived with one long enough yet to observe the results (I have 
>both controllers side by side in my system now, with a transfer switch 
>to let me flip back and forth. I'll post comparative observations 
>eventually.)

The OutBack MX60 includes several different ways to battery minimize 
water consumption from excessively long absorption charging periods.  

The MX60 includes both an adjustable timed absorption period and a "END 
AMPS" method - they can be used together even. The time absorption is 
the maximim time it will absorb - the END AMPS can be used to force a 
transistion to float sooner. The default settings of the MX60 provide 
for a timed absorption period only.  The default time is 2 hours (it is 
adjustable from 0 to 4 hours).  There also is minimum absorption time 
period setting as well - it is defaulted currently to zero. This is 
useful when charging a small battery with a large PV array that pushes 
the voltage up very quickly even though the battery isn't fully charged 
yet.       

Using only a END AMPS method can be a problem under certain conditions 
as it may allow absorbing the battery for too long - resulting in 
excessive water usage.  Using multiple control methods handles a variety 
of different possible problem conditions.    

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  

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