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

[Darryl Thayer]

Hi Travis and Chris
I have a 72 volt MPP system 2400 watt on two each two
axis trackers here in minnesota, Where we have seen
-30F on several bright days.  It is one of the earily
MX60s and I think it is now three years of operation. 
I did not worry, I did not think this through.  The
system has been flawless.  

I would think with the newer MX60s there would be even
more margin of error.  I only wish I could have Wired
for 96 volts.  

Darryl

--- "Travis Creswell, Ozark Solar" <ozsolar at ipa.net>
wrote:
> 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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