[RE-wrenches] AC Coupled + CC Grid Feed Input

[Nick Soleil]

Hi Drake,

I'm happy to discuss the ins-and-outs of this with you by phone.  My cell
phone is listed below.  I have installed AC Coupled systems using Outback
GVFX inverters and a 120-240 transformer.  My experience is that this works
fine.  We have published a basic document on this, which is primarily
focused on the major pitfalls;
- Protect the batteries from overcharging
- Don't exceed the pass through limit of the GVFX inverter
- Don't allow the Enphase microinverters to connect directly to the output
of a generator

With the Outback GVFX inverters, I would recommend using the auxiliary
relay of the Outback inverter to shut-off the microinverters with a relay
when the batteries are charged.

The tech brief on AC Coupling is available under the tab for Tech Briefs
at; http://enphase.com/global/resources/geo_us/



On Wed, May 28, 2014 at 2:47 PM, Drake <drake.chamberlin at redwoodalliance.org
> wrote:

>  Hello Wrenches,
>
> We put a system in a year ago with an Outback GVFX 3524 with 2205 W of PV
> and a Midnite Solar Classic CC. The system owner would now like to expand
> the system by another 6 modules.
>
> Our tentative plan is to AC couple 6 Enphase  M-215s powered by 6 REC 255
> W modules to the Outback. This way, the GVFX 3524 would be selling power on
> its own while simultaneously feeding power back into the grid through its
> transfer switch.
>
> The plan is to drop the voltage to 120 V using an autotransformer before
> feeding the power into the protected loads panel for AC coupling.
>
> Has anyone tried this configuration? Can anyone see any problems?
>
> 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/
>
>
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-- 

Cordially,

*Nick Soleil*


*Field Applications Engineer*

*Enphase Energy*

Mobile: (707) 321-2937


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1420 North McDowell

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P: (707) 763-4784 x7267

F: (707) 763-0784

E: nsoleil at enphaseenergy.com


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 <nsoleil at enphaseenergy.com>

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