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:g...@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-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Gary
Willett
*Sent:* Tuesday, April 12, 2011 8:35 PM
*To:* re-wrenches@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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