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

[Brian Faley]

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