[RE-wrenches] Voltage discrepancy

[Drake Chamberlin]

Thanks Jeff,  That could be the explanation.  Outback has metering 
issues with the Mate too.  When I talked to a tech support about he 
fact that the Mate on my system seemed woefully inaccurate, she 
chuckled and affirmed that the were pretty approximate.

-Drake


At 07:12 PM 8/19/2010, you wrote:
>I have seen this on my last 3 MX60 controllers and it is very 
>frustrating and looks to be a design flaw. I can calibrate the 
>meters to be accurate at either the Absorb point OR the Float point 
>but NOT both!! Not only that but the meter calibrations tend to 
>drift a bit in just a matter of days, just .1V not a big deal but 
>anymore than that on a 12V sealed battery and it could be an issue. 
>I spoke w/Outback about this and heard a mumbled "Ahh, uummm, yeah 
>that is an issue". I'm guessing that you're seeing the same thing 
>and when you spoke w/your customer again and the meters all agreed 
>I'll bet it is because the MX was at the "line up point" of the 
>other meters (just like a broken clock being correct twice a day!). 
>The only way to live with this is to get the more important Absorb 
>set point right on and take what you get on the lower end. It works 
>and is usable but drives customers nuts when they have additional 
>meters. In my experience the Tri-mets are dead on.
>

Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM  Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648  
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