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

[Mark Frye]

Thanks Brian,

My understanding is that the SI/SB combination is the only grouping of
equipment that provides proportional control of the output of the AC coupled
inverter.  

But, this is what is love about AC coupling, there are so many ways to skin
so many different kinds of cats. I really like the DC diversion side
solution if you have someplace to put the power instead of just the
batteries, although that might be generally less commonly available for
retrofits into existing on-grid households.

Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City,  CA 95959
(530) 401-8024
www.berkeleysolar.com 

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Brian Faley
Sent: Wednesday, April 13, 2011 10:21 AM
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter

Esteemed Wrenches,

There are other battery based inverters with Frequency Shift for use in AC
coupled systems. Magnum MS4024PAE and MS4448PAE models shift the output
frequency + >0.5Hz based upon battery voltage. On 24V models the set point
is 0.2V above absorb voltage, and on 48V models it is 0.4V above absorb. It
will protect the battery against overcharge by dropping the AC coupled Grid
tied inverter offline. It can be used as a method of regulating AC coupled
grid tied systems, but works best when there is a DC side diversion load
controller.

Brian Faley
Chief Engineer
Magnum Energy
2111 W Casino Rd
Everett, WA 98204
425-353-8833
bfaley at magnumenergy.com
 
> ------------------------------
> 
> Message: 3
> Date: Tue, 12 Apr 2011 21:37:06 -0700
> From: "Mark Frye" <markf at berkeleysolar.com>
> To: <Gary at IcarusSolarServices.com>,	"'RE-wrenches'"
> 	<re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter
> Message-ID: <0FAC7002A96948B598E5EF79FF3D77E6 at marksdell>
> Content-Type: text/plain; charset="us-ascii"
> 
> 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
>  <http://www.berkeleysolar.com/> www.berkeleysolar.com

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