Sunny Island vs Outback [RE-wrenches]

[Darryl Thayer]

Hi Peter
My experiance with Outback Island is very limited, 1
system, but I will be working on a bigger install
soon.  

The AC-in is grid, and grid loads.  The AC-out is for
AC coupling to the other inverter and critical loads. 

When the grid is up the OB internal relay is closed
and the second inverter sees the grid. Then the other
inverter and the OB sell to the grid at a maximum of
60 amps (7.2 kw) and the OB and other inverter share
the 60 amp OB transfer relay.  If the second inverter
is a 240 volt and you have only one OB (120 volt) then
use an auto transformer.  

When the grid goes down the OB provides a 1741 quality
AC signal to the other inverter to sync up to.  If the
second inverter is providing power in excess of the
critical loads, the OB absorbs the power and charges
the battery. If the battery reaches Float or maybe
higher, the DC power is dumped up to the maximum of
the OB charger plus the solar on the OB-DC side.  In
my one inverter system I used a Tristar 60 as a
diversion controller to dump the OB charger power and
the MX60 to control the OB solar source. 
Hope this helps, and hope people with more experiance
will chime in. 
Darryl      

--- Peter Parrish <peter.parrish at calsolareng.com>
wrote:

> 
> 
> We may have missed threads on this subject, so I
> apologize in advance if the
> information is out there already. If it is I would
> appreciate the starting
> date of the thread(s) and I will track it down.
> 
> We have installed four Outback/GroSolar grid-tied
> battery backup systems,
> and two more are various stages of design and
> bidding. They're relatively
> straightforward to deign and install, but I do have
> some criticisms of their
> "rating game" and the fact that the California
> Energy Commission power
> rating and rebate for the 3,600 W (48V) system is
> surprisingly low. 
> 
> Here are my questions in no particular order of
> importance:
> 
> (1)   If the Outback system is based on "grid-tied
> loads" and "critical
> loads" which are isolated from each other, do the
> Sunny Island AC2
> (gen/grid) and AC1 (loads/SBs) serve the same
> purpose? With the SI system,
> where exactly are the conventional (non-critical)
> loads connected? To AC2?
> To the utility side of the Gen/Grid relay?
> 
> (2)   If the Outback system has a single set of PV
> modules and charge
> controllers that provide the conditioned voltage on
> the 48 V buss, and the
> Sunny Island system can have a hybrid mixture of
> conventional grid-tied
> PV/inverters and PV/charge controllers - what
> additional capabilities are
> there with the Sunny Island approach? Can the SI
> approach be configured more
> inexpensively for the same functionality.
> 
> I have a couple of other questions, but these will
> suffice for now. Thanks
> in advance for the help.
> 
> - Peter
> 
> Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> 820 Cynthia Ave., Los Angeles, CA 90065
> Ph 323-258-8883, Mobile 323-839-6108, Fax
> 323-258-8885
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com  
> 
>  
> 
> 
> [Non-text portions of this message have been
> removed]
> 
> 
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