OutBack "Quad" Systems [RE-wrenches]

[Christopher Freitas - OutBack Power]

Darryl Thayer wrote:

> Now if I use an Outback stack of four VFX3648 what is
> my starting surge capability?  

All of the OutBack FX or VFX series inverter/charger have the same motor 
starting current limits.  Each will give you 70 amps "peak" 
(milliseconds) and 50 amps "rms" (seconds+).  This is only part of the 
complete story however - since the OutBack inverters are able to 
actively limit the current to these maximum levels without over-current 
tripping like some older designs. This allows starting of larger motors 
with less current...  

> Also have others used this 4 stack in a similar
> situation?

The first "quad" system was installed in Haiti last spring - it is 
running a small hotel which has a satelite internet and telephone 
system. This system does charge from the utility - but the power is off 
80% of the time in Haiti currently so they also have a good sized PV 
array.  The operation of the system has been very good (after a few 
initial issues were resolved).  

Many other of the quad systems have been installed as well - I know of 
at least 10 in Hawaii and probably more in CA.  There would have been 
more except that many installers have been telling us that two of the 
OutBack inverters have been able to meet the needs of the customers 
where they would have sold them 8 or even 11 kW of SWs previously. 

We are just now finishing up the first field installation of a 
"Dual-Quad" system - 28.8 kW continuous @ 48 vdc (eight of the VFX3648s 
in a series-parallel 120/240 VAC configuration). It is powering an 
off-grid PV powered office building near downtown LA.  More details and 
photos will follow.  

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas at outbackpower.com  www.outbackpower.com
Tel 360 435 6030  Arlington WA USA

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