[RE-wrenches] Voltage discrepancy

[boB Gudgel]

Jeff Oldham 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.
>

Jeff, what size wire from charge controller to the battery are you using 
??   The bigger the wire, the less the
I*R drop and the less the voltage discrepancy ~should~  be, at higher 
currents.

boB




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