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

[Ron Young]

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Thanks Jay, I kept hitting .7 on the calculation instead of .17 &  
Mick, I'll check out the XW sizing chart, thx. I'll still have to  
whack my fingers with a wrench if they keep inputting the wrong data ...

On 3-Nov-07, at 7:32 AM, Jay Peltz, Peltz Power wrote:

>
> Hi ron,
>
> Maybe my calculator  is wrong but 39 x .170= 6.63
>
> So 2 modules in series = 13.26v
> + 68v x 2 = 136
> +13.26
> = 149v
>
> On the edge but there.
> jay
>
> peltz power
> On Nov 3, 2007, at 1:00 AM, Ron Young wrote:
>
>>
>> Okay so here's where I'm getting mired down. The Sanyo 195 has a  
>> Voc of 68.1. I'm using a temp correction factor of .170 per degree  
>> C (ref. the chart in Home Power #121) and potential low temps  
>> around -14 degrees C. in my locale. Based on the 25 degree STC  
>> ref. temp that works out to 39 x .170 = 27.3 volt correction  
>> factor. This results in an effective Voc of 68.1 + 27.3 = 95.4  
>> which seems unreasonable to me, have I miscalculated? Is the temp  
>> correction factor only relevant for NEC compliance which doesn't  
>> apply in my off-grid situation?
>>
>> Earlier in this discussion I was using a temp. correction factor  
>> of 1.25 which gave me Voc of 68.1 x 1.25 = 85.12.
>>
>> In either case a series connection of two modules will be  
>> impossible with an MX60, exceeding the maximum output voltage of ~  
>> 140 V.
>>
>> Ron Young
>> earthRight Solar
>>
>>
>>> From: Ryan Mayfield <ryan_mayfield at earthlink.net>
>>>
>>>
>>> There is a great PV reference chart in the last Home Power, #121.  
>>> From
>>> that info, the Sanyo 190 has a Voc temperature correction factor of
>>> -0.169V per degree C.
>>>
>>> Ryan
>>
>> 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
>>>
>>
>>
>>> From: William Miller <wrmiller at charter.net>
>>>
>>> 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
>>>
>>>
>>
>>
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>
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