Thanks Matt,
It sounds like the information is a little irrelevant to current technology in terms of safety and interfacing with the grid as it applies to permitting. Given the power quality and safety of grid-tie inverters it would be beneficial for permitting agencies to move past these issues and on to more relevant line items in their permit applications. I believe this will be the second grid-tie PV system on this particular utility, so the PV permitting process is a little new to them. Thanks again. Orion Thornton Independent Power Systems _____ From: [email protected] [mailto:[email protected]] On Behalf Of Matt Lafferty Sent: Tuesday, April 21, 2009 12:12 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Inverter Data Hi Orion, RE: Can anyone help me to determine the commutation type and rated power factor (%) for a Fronius 4000 IG. Line commutation. Basically, this means they sync with an existing grid (line). Non-islanding inverters are line commutated. PF = 100% (aka 1.0 PF) according to their spec sheet. Double-check your copy to make sure your application matches the datasheet... Technically, grid-tied inverters operate at Unity Power Factor, i.e. "the same PF the grid is giving it". But "Unity" is not a number, percentage or otherwise. I used to put it on applications back in the day, just to be ornery. Good luck! Matt Lafferty
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