In Minnesota there are no charge for residentical power factor or for demand. Industrial commerical services have demand charges and power factor, i.e. VAR related charges. These charges start at 90% PF, most of my customers have PF greater than 90%. If I propose a solar system I enclude PF correction value discussion. Darryl
----- Original Message ---- From: Bill Brooks <billbroo...@yahoo.com> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Sent: Fri, January 7, 2011 1:13:39 AM Subject: Re: [RE-wrenches] Xslent? Jay and Peter, Paying extra because of reactive power is not the reason for having this feature presently. The charges for reactive power are insignificantly small to the customer. The real reason for reactive support has to do with utilities beginning to require it as a condition for interconnection. While I have heard of a few small systems where reactive power has been required for small systems (that is quite silly), it is normally associated with very large PV plants (5-50MW). The 6kW system outperforming a 10kW system should cause all sane people's BS meters to peg the limit--that is utterly preposterous without significant shading. All companies making such unfounded claims, without detailed qualifying statements to define when the claim would be true, should be shunned from the PV industry until they behave. Several companies over the years come to mind with that statement. Bill. -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of jay peltz Sent: Thursday, January 06, 2011 4:43 PM To: RE-wrenches Subject: Re: [RE-wrenches] Xslent? HI Peter, I agree with you that for now on residential it makes no sense. However for commercial that might have to pay extra for PF issues, to have the inverter adjust for this makes sense. Its the reason they( inverter companies ) are doing it. I"ve heard a better more complete reason of course from Bill Brooks, who maybe can chime in. sorry got away from me, jay peltz power On Jan 6, 2011, at 2:34 PM, Peter Parrish wrote: > I can't understand how any inverter WOULDN'T deliver its power with the > voltage and current 100% IN PHASE. > > When the voltage and current are not 100% in-phase that represents reactive > power. Reactive power flows positive for a quarter of the AC cycle, then > negative for a quarter of a cycle, then positive and then negative. The net > result over one AC cycle is ZERO power delivered to the load. > > So reactive power is worthless. > > Worse, it results in higher currents (and voltages) for the same amount of > in-phase power, putting additional stress on circuits. > > - 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 _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org 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 _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org 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
