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

[Jay Peltz, Peltz Power]

<x-flowed>

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
>>
>>
>
>
> - - - -
> Hosted by Home Power magazine
>
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://lists.topica.com/lists/RE- 
> wrenches/read
>
> List rules & how to change your email address: www.mrsharkey.com/ 
> wrenches/etiquette.php
>
> Check out participant bios: www.mrsharkey.com/wrenches/
>
> Moderator: michael.welch at homepower.com
>


- - - -
Hosted by Home Power magazine

To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at re-wrenches.org

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------


</x-flowed>