I have seen the top performing contractor in my area sell behind a chiminy and under a tree, claiming 10% more using Enphase than unshaded. Darryl
--- On Sun, 10/10/10, Jamie Johnson <[email protected]> wrote: From: Jamie Johnson <[email protected]> Subject: Re: [RE-wrenches] Enphase v. string inverter To: "RE-wrenches" <[email protected]> Date: Sunday, October 10, 2010, 7:38 AM Marco, The last I heard the NREL was testing enphase vs. a string inverter, they were also suppose to test enphase vs. A competitors module level mpp tracking. Not sure if that performance test is complete yet. I have seen 1 independent unshaded test ( potentially biased ) which IIRC showed enphase ~1% less than a string inverter, this seems to match the inverters CEC rating. What we see around here is an over estimate of kWh production by the selling contractor using enphase, sometimes by 50+% greater than unshaded kWh estimates. Performance guarantees with monetary compensation back to the customer if estimates are not met can be a good thing and improve the industry IMHO. Jamie Johnson General Manager SOLAR POWER ELECTRIC TM NABCEP Certified Solar PV Installer #031310-118 (941) 380 - 0098 www.SPEFL.com Commercial & Residential FL State Certified # EC13001765 Sent from my iPhone On Oct 9, 2010, at 7:07 PM, "Marco Mangelsdorf" <[email protected]> wrote: Does anyone know of any reports out there from a neutral, 3rd party which compares an Enphase array with an array using a string inverter with both arrays on the same unshaded surface? Some Enphase peddlers here are saying that the energy harvest from an Enphase system is going to be better since they supposedly come on sooner and stay on later in the day. One guy is actually saying that the Enphase inverters come on before the sun comes over the horizon. Maybe from the same family that claimed that a-Si modules produced power from the moonlight. Thanks, marco _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -----Inline Attachment Follows----- _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
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