[RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter

[Gary Willett]

Thanks Mark for educating me about FSC.

Reading SMA docs, FSC allows the Sunny Boy's AC output to be varied from 
maximum to zero when the
Sunny Island varies its AC output frequency between 60Hz and 61Hz.

Based on your response - do you - or any other Wrenches - have any 
experience AC coupling the
Fronius inverters? Do they have any problem maintaining connectivity to 
the "local" grid
when the big grid is down? Are there any battery-based inverter/chargers 
that Fronius does not like?

I don't want to be on the "bleeding edge" and be the first one to ever 
design an AC coupled battery
backup system using Fronius. I will call Fronius support next, but any 
feedback from the group will
be much appreciated.

Gary Willett, PE
Icarus Solar Services LLC
<mailto:Gary at IcarusSolarServices.com>

On 4/12/2011 11:37 PM, Mark Frye wrote:
> Gary,
> I have been looking at some AC coupled stuff lately. The "FSC" is 
> propriatary to SMA, Sunny Island to Sunny Boy.  Pretty much anything 
> else you need something to sense the voltage of the battery bank so 
> you can open a contactor on the AC line to the Fronius when the 
> battery voltage gets too high. Once the voltage drops the contactor 
> can close and bring the Fronius back on line and then the 5-minute 
> start up delay before it is feeding the line again.
>
> Mark Frye
> Berkeley Solar Electric Systems
> 303 Redbud Way
> Nevada City,  CA 95959
> (530) 401-8024
> _www.berkeleysolar.com_ <http://www.berkeleysolar.com/>
>
> ------------------------------------------------------------------------
> *From:* re-wrenches-bounces at lists.re-wrenches.org 
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Gary 
> Willett
> *Sent:* Tuesday, April 12, 2011 8:35 PM
> *To:* re-wrenches at lists.re-wrenches.org
> *Subject:* [RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter
>
> Working on a proposal to add battery backup and a generator to an 
> existing 10kW grid-tie system using the Fronius IG Plus 10.0 inverter.
>
> Does anyone have any experience AC coupling this inverter to a Sunny 
> Island 5048, or a Xantrex 6048? Is the Fronius capable of Frequency 
> Shift control (FSC) that comes from the battery-connected inverter?
>
> Any other suggested solutions is appreciated.
>
> Gary Willett, PE
> Icarus Solar Services LLC
>
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