Higher than 48 nom Arrarys (was Different perspectives,) [RE-wrenches]

[Travis Creswell, Ozark Solar]

I must admit that I'm a little nervous about wiring the array for 72
volts.  Could you address the issue of the Outback's DC breakers AIC
rating of 7.5k amps at 80 volts.  What is the AIC rating at 105 or
higher?  This is an easily attainable MPP voltage during cold weather.
I've seen solar equipment supposedly rated at 125 VDC fail at 100 volts
or less is why I ask.

Thanks

Travis Creswell
Ozark Energy Services, Inc.


   

-----Original Message-----
From: Christopher Freitas --- OutBack Power
[mailto:cfreitas at outbackpower.com] 
Sent: Friday, January 09, 2004 1:52 PM
To: RE-wrenches at topica.com
Subject: RE: Different perspectives, was: Rain-X on module glass?
[RE-wrenches]

Good point Windy - This is one of the benefits of wiring up the PV array

for 72 vdc nominal (three 24vdc modules in series) with a 48 vdc battery

system for instance (or lower).

Another way to look at it - as long as the peak power point of the PV 
array stays above the battery voltage - the losses are minimal 
(proportional to the temperature).  If the peak power point drops below 
the battery voltage - then you start losing lots more power.  

When you start with a peak power point of 90 vdc or so - it has to be 
really hot for it to get down to the 50 volt level ;-)

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

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