While we are discussing this, I have a suggestion. We are using the Generac Smart Management Module as a load management unit for generators. It automatically senses that the power is coming from the generator. It has a lock out mode, so it can be used to disconnect the inverter(s) when the generator is running without needing any wiring. I anticipate this to save a lot of cost and allow a more robust system when combining generators and inverters.
On Tue, Oct 20, 2015 at 12:25 PM, Chris Mason <[email protected]> wrote: > 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 > -- 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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