Larry:
Thanks for the reply. Can you use Outback and Xantrex charge controllers
with the positive ground?
William Miller
At 09:14 PM 3/19/2009, you 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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