[RE-wrenches] AC Coupling Relays

[boB at midnitesolar.com]

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
> /http://athens-electric.com/

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