We have tied in the PV to operate when the generator is operating, but only on a very large generator when the PV output was very small compared to both generator output and load (in which case it apparently looked like a reduction in load the to the genset, and actually saved some fuel). But I agree that there is significant potential for damage to the generator controls, etc., and would not validate or recommend it.
Solectria has a nice white paper on the subject: http://solarprofessional.com/articles/products-equipment/inverters/q-a-interaction-of-grid-direct-inverters-with-backup Also, discussions we’ve had with Enphase have been that it may be possible but would void the inverter warranty, which may well be the case with other inverter manufacturers. Best regards, Lloyd Hoffstatter NABCEP PV Installer, NY-Sun trainer From: RE-wrenches [mailto:[email protected]] On Behalf Of jay Sent: Tuesday, October 20, 2015 12:37 PM To: RE-wrenches <[email protected]> Subject: Re: [RE-wrenches] Generator backfeeding enphase? I don’t think you are missing anything. jay On Oct 20, 2015, at 9:01 AM, Howie Michaelson <[email protected]<mailto:[email protected]>> wrote: Does anyone think that there is no issue with having enphase potentially backfeeding a backup generator? We almost always will tie in upstream of a generator transfer switch, but a competitor is telling clients with an enphase system there is no concern. Am I missing something? Thanks, Howie Howie Michaelson NABCEP Certified Solar PV Installer™ Catamount Solar Renewable Energy Systems Sales and Service VT Solar Electric Incentive Partner http://www.CatamountSolar.com<http://www.catamountsolar.com/> 802-272-0004
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