[RE-wrenches] Sunpower modules

[jay peltz]

Hi Larry,

  I was under the impression that Sunpower were only for on grid?

And for off grid with the low voltages that we use, they are still  
requiring you to use positive ground?  I've seen the white paper they  
did and it showed at lower voltages there is no need to positive  
ground, thats why for example those 90 watt panels using Sunpower  
cells are used with Negative ground.

curious,

jay

peltz power
On Mar 19, 2009, at 9:14 PM, Larry Crutcher, Starlight Solar wrote:

> William,
>
> I know you asked Jeff but thought I would respond as all we do are  
> off grid, battery based systems. I typically see that the Vmp  
> voltage of Sunpower modules is closer to spec with than with  
> Kyocera, Sharp or Mitsubishi. In my opinion Sunpower modules are  
> only surpassed by Sanyo. I realize this is anecdotal but after  
> hundreds of installs you begin to notice these things.
>
> Larry Crutcher
>
> On Mar 19, 2009, at 5:46 PM, William Miller wrote:
>
>> Jeff:
>>
>> Have these modules worked for you in battery based systems?
>>
>> William Mill
>>
>>
>> At 01:27 PM 3/19/2009, you wrote:
>>
>>> Hiya Jeff,
>>> You are correct that the sunpower modules are positively  
>>> grounded.  You are
>>> also correct that sunpower only deals with dedicated "dealers".   
>>> That means
>>> that if you are not one of their dealers you cannot get their  
>>> panels.  It is
>>> my understanding that sunpower is always looking for new dealers,  
>>> so you may
>>> want to check in with them.  As far as architectural review  
>>> committees and
>>> such, we have never had a problem using SPR modules in the areas  
>>> where
>>> review is an issue.  The positive ground really does not affect  
>>> aanything.
>>> Instead of your negative wire being the grounded (white) conductor  
>>> it is
>>> your positive conductor that is grounded.  This means you are  
>>> switching the
>>> negative instead of the positive in the DC disco.  Sunpower sells  
>>> packaged
>>> systems, so they provide positive ground inverters from different
>>> manufacturers.
>>>
>>> Evergreen now has a black framed module, and I believe Sharp does  
>>> too.  I
>>> hope this helps, any other questions feel free to contact me.
>>> Jeff Blick
>>> Lead PV Installer
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