[RE-wrenches] Discrepency between inverter kWH reading andsolar production meter

Sat May 23 10:51:13 PDT 2015

Kevin,
My experience with inverter based kilowatt hour readings is that they are
always optimistic. My experience with SolarEdge shows the SolarEdge
kilowatt hour reading runs about 2 percent higher then the utility grade
meter. I have found similar discrepancies with SMA , Fronius and other
inverter manufacturers.

Carl Adams
President, SunRock Solar
mobile 513.290.9072
On May 22, 2015 8:39 PM, "frenergy" <frenergy at psln.com> wrote:

>  Hopefully there tech department can shed some light on this for you,
> however, it would certainly be to SolarEdge's benefit to appear to be
> producing more power than it really is, well, unless, Hmmmm ..........
>
> Bill
>
>
> ----- Original Message -----
> *From:* Jarmo.Venalainen at schneider-electric.com
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *Sent:* Friday, May 22, 2015 4:00 PM
> *Subject:* Re: [RE-wrenches] Discrepency between inverter kWH reading
> andsolar production meter
>
> Hi:
>
> The difference is in the accuracy of revenue grade versus inverter KWh
> meters.  Revenue grade is typically much more accurate.
>
> Beyond that, even if the accuracy of both was really good at lets say +/-
> 0.5%, you could still get a 1% overall difference in readings as one could
> be +0.5% and other -0.5%, even though they are both working to spec.
>
> JARMO
>
> _____________________________________________________________________________________
>
> *Jarmo Venalainen*  |  * Schneider Electric **  |  Xantrex Brand*  |
> *CANADA*  |   *Sales Application Engineer*
> *Phone:* +604-422-2528  |   *Tech Support:* 800-670-0707  |   *Mobile:*
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> *Email:* *jarmo.venalainen at schneider-electric.com*
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>
>   From: Kevin Eigel <kevin at ecohousesolar.com> To: RE-wrenches <
> RE-wrenches at lists.re-wrenches.org>,  Date: 05/22/2015 02:38 PM Subject: [RE-wrenches]
> Discrepency between inverter kWH reading and solar        production meter Sent
> by: "RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>
> ------------------------------
>
>
>
> I recently installed a Solaredge 7600 inverter and two feet away from it
> installed a GE 210 solar kWh utility grade meter. Over the course of three
> months the kWh production measured by the inverter is more than 200 kWh
> greater then the production showing on the GE meter. I  changed out the GE
> meter for the last week and the discrepancy has continued, so it looks like
> it is not the meter.
> I am looking for any help in understanding whey there is this large
> discrepancy on the kWh reading between the inverter and the production
> meter, when they are so close together. The Solaredge technical help desk
> has been of no use.
>
> --
> Kevin Eigel
> President
> Ecohouse Solar
> 1857 Northwest Blvd. Ste 201, Columbus, OH 43212
> www,*ecohousesolar.com* <http://ecohousesolar.com/>
> 614-805-5776
>
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