John Kozell's posts

Posted by John Kozell on Aug 25, 2011 06:13 pm

#1 -  Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > Re: Should I wire solar panels in series or parallel?
Thanks Tom/Eric,

I hadn't bought the controller yet, but was planning for an MPPT. So far I'm leaning towards the Rogue MPT-3024.

-John
 

Posted by John Kozell on Aug 25, 2011 08:07 am

#2 -  Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > Should I wire solar panels in series or parallel?
So if I have 2 identical KD135SX-UPU panels (17.7v Max Power, 22.1v Open Circuit) and I’m charging a 12v battery bank (4 @ 6v, or 6+6 & 6+6), if the controller is capable of handling 44.2v of input from the panels…
Is there an advantage (or disadvantage) to connecting the panels in series to get 35.4v into the controller, instead of 17.7v in parallel?

The 2 advantages I can think of so far are:
1.   Less voltage drop from the panels to the controller (given the same wiring).
2.   As the panel operates in reduced performance, the voltage might drop below a desired charging voltage of say 14.4, if wired in parallel, but would say well above that if wired in series.

Am I on the right track, anything else I should consider?

Thanks

-John
 

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