Sanyo panel & CControllers [RE-wrenches]

[Christopher Freitas --- OutBack Power]

We have looked at this but I fear what John Wiles would end up saying - 
if its part of the controller then when the breaker is opened or the GFP 
trips then the PV voltage would exceed the controller's UL voltage 
rating.... sort of a catch 22.  There also might be failure mode 
concerns during the UL listing process which can get very expensive.  

Its surprising how many watts a PV array can produce even at a voltage 
just below the open circuit level - a voltage clamp would need to 
dissipate 500 watts or so of power to pull down the PV array voltage 15 
volts on most 3kw PV arrays (depends on the exact panels and 
temperatures involved).  If the battery was full then the clamp would 
need to do this continuously... 

I have built a number of prototype voltage clamps - including one I have 
been running for over 2 years now on my Harris Hydro system - but no 
clear solution was determined to be "all-purpose".  

Keep also in mind that going above 150VDC requires higher voltage rated 
breakers and GFPs as well - which get more expensive again.    

We are still working on a solution...
 

Christopher

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


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