Sanyo HIT panels in off grid app [RE-wrenches]

[William Miller]

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Ron:

When calculating total Voc there are two considerations:  legal and technical.

The NEC compliance has only come into relevance for my projects when the 
total VOC as corrected by NEC correction factors exceeds 600 VDC.

In this case, the only limit is the manufacturer's design limitations in 
the charge controller.  Using NEC correction factors is irrelevant 
here.  Instead, the module manufacturer's or the industries correction 
factors must be applied.  I don't use them often and don't have them handy, 
but I am certain someone else on the lists does.

William Miller


At 10:45 AM 11/2/2007, you wrote:

>When I apply the NEC correction to the MX60 limit, the STC Voc limit
>for my area, based on a low temp record of -22F (optimistic) in
>Central BC is 150 V / 1.25 = 120V.  So, for example, if I'm using a
>195w Sanyo the Voc is about 68v x 2 = 136v which would be over the
>Voc limit. Did I get that right?
>
>Ron Young
>
>earthRight - Solareagle.com
>Williams Lake, BC
>Canada
>
>
>On 2-Nov-07, at 9:15 AM, Jay Peltz, Peltz Power wrote:
>
>>
>>Hi Larry,
>>
>>The 190s are 67.5v, so x 2 = 135VOC
>>which give around 15v to play with.
>>
>>I don't have their voltage adjustment figures in front of me, but
>>when I did the calculations given our
>>record lows, it was close but the numbers did work out OK for the 2
>>in series.
>>
>>jay
>>
>>peltz power


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