Fronius inverters - Reliability? [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Hiya Peter,
In my experience, ALL inverter manufacturers' total KWH meters are - 
shall we say- "exuberant".
Fronius seems to run about 5% high. Better than some...
Cheers, Bob-O
On May 27, 2008, at 6:10 PM, Peter Parrish wrote:

>
> I have a question about the accuracy of the "energy supplied (kWh)  
> total"
> for Fronius inverters. Does anyone know how it is spec'd and what  
> are the
> numbers?
>
> In the Los Angeles DWP territory, we are required to install a  
> "production
> meter" in series with the inverter and we regularly use the GE I70S
> "odometer" style meter. We buy these from Austin International and  
> they spec
> the accuracy of these meters at +/- 0.3%.
>
> I have been regularly seeing discrepancies of up to 10% difference  
> between
> inverters and production meters. Usually, the GE meters read low  
> compared
> with the inverter.
>
> For example, we have an IG-5100 which now reads 7,250 kWH and a GE  
> meter
> that reads 6,560 kWh. The Fronius came reading 6 kWh, presumably  
> due to
> bench burn-in testing. The GE unit came reading 9,999.
>
> Information on the accuracy of the Fronius would be great (because  
> in this
> case I have a very puzzled customer); and if anyone is accumulating
> statistics on inverters vs. production meters in general I would be
> interested in what people are finding out.
>
> - Peter
>
> Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com


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