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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