All meters are analog at the point of measurement, because the signals that are being measured are analog. What makes a meter "digital" is the conversion of the original analog data to digital format and downstream data manipulation. Therefore I doubt digital meters are fundamentally more or less accurate than analog. There is one point I would like to make: we have not used the GE I70S, the electromechanical (100% analog) meter with pointers, for several years now. We were told by a Southern California Edison engineer that they were not reliable (i.e. stopped working) and they were less accurate than +/-5%. Sure enough within a month the meter in question stopped worked and required a "rap" on the bezel to start working again, only to freeze up again in a few days. I remember two others that stopped working (one perhaps never worked). We got these puppies from Austin International in SC. We use the Itron Centron C1S and have been happy ever since. - Peter Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 CA Lic. 854779, NABCEP Cert. 031806-26 peter.parr...@calsolareng.com Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
_____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Keith Cronin Sent: Friday, May 07, 2010 12:28 AM To: RE-wrenches Subject: Re: [RE-wrenches] FW: Enphase performance Makes you wonder what is officially calibrated to what....is digital more accurate or analog utility meters...?? _____ From: Marco Mangelsdorf <ma...@pvthawaii.com> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Cc: Douglas Bath <doug...@pvthawaii.com> Sent: Thu, May 6, 2010 8:11:16 PM Subject: [RE-wrenches] FW: Enphase performance Marco, I have a revenue grade kWh meter on my 3 Enphase 175 system that is owned by the utility (production based incentive in WA state) and the Enphase monitoring reads about 6% over the revenue meter. This has been over a one year period. I've been very pleased with the performance using either measurement. Brad AEE Solar
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