Hi Drake, I think you can put a power diode in parallel to the gt inverter that can conduct that inductive current if you need to. However, I think BoB is correct, there should just be induction of the wiring itself for most grid-tied inverter. The relay engineer recommended this diode for a DC load break application I recently had, so I assume AC would be the same.
Thanks On Mon, Jun 16, 2014 at 9:11 AM, b...@midnitesolar.com <b...@midnitesolar.com> wrote: > > Since grid-tie inverters sell back with a power factor of 1, the load > ~should~ be entirely resistive and > not inductive or capacitive so a appropriately rated relay contacts > ~should~ be fine. > > Except maybe if the inverter is designed to supply VARs like the last > Solar-Pro magazine talks about. > (haven't actually read that article yet but I assume that's what it is > about) > > Of course, others may have different experiences so I would listen to them. > > I prefer to use a somewhat over-rated relay. > > boB > > > > On 6/16/2014 7:05 AM, Drake wrote: > > Hello Wrenches, > > Do the relays that break the current from the direct grid tie inverters, > in AC coupled systems, need to be motor rated or can they simply be rated > for the amperage of the inverter output? How inductive is the current > between the two inverter systems? Will the current tend to jump the > contacts on a non motor rated relay, or burn them out prematurely? > > Thanks, > > Drake > > > Drake Chamberlin > > > > > > *Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified > Solar PV 740-448-7328 <740-448-7328> *http://athens-electric.com/ > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
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