He's wrong. Any inverter system will try to raise the voltage of the system, that's how grid tied inverters feed power to the load. With the utility grid, there is no issue as the inverter cannot move the voltage any significant amount (unless there is a high resistance point). With a generator which is also trying to feed the same load, as the inverter's output power comes close to the load, the voltage will rise and the generator's AVR will get confused. It will reduce the excitation to the alternator and will likely start to motor if the inverter's power output exceed the load. The generator can shut down if the the system voltage exceeds the high voltage setpoint, and other bad things can happen such as damage to the AVR and stator windings. There's no real way to know what will happen. In many cases where the load exceeds the inverter output, nothing bad happens, but it's a crap shoot.
On Tue, Oct 20, 2015 at 12:01 PM, Howie Michaelson <[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 > 802-272-0004 > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Chris Mason NABCEP Certified Solar PV Installer™ Solar Design Engineer Generac Generators Industrial technician www.cometsolar.com <http://www.cometenergysystems.com> 264.235.5670 869.662.5670 Skype: netconcepts
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