[RE-wrenches] Generator backfeeding enphase?

[Lloyd Hoffstatter]

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:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of jay
Sent: Tuesday, October 20, 2015 12:37 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
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 <howie at suncatchervt.com<mailto:howie at suncatchervt.com>> 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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