Mark,
From an inverter manufacturer's standpoint there is a huge advantage in
running positive ground in all installations. Since the ground is
provided through the GFDI circuit of the inverter, only one
configuration of inverter must be stocked, and there is no need to
provide field configurable ground connection. This saves a SKU, a
little bit of money, and confusion in the field.
See Ya!
Marv
Enphase Energy
707 763-4784 x7016
Mark Frye wrote:
I am sorry to hear that folks are having these kinds of problems.
As I understand it, only module types made up of back contact cells such as
the SunPower are run with positive ground.
These modules actually require positive ground to reduce static charge build
up on the front of the cell which can reverse bias and shut down the module.
I don't know, but it seems to me that folks have somehow mixed up the high
yield of the back contact cell with positive grounding so now positive
grounding will increase the yeild other types of cells.
Do I have the story about right? Running front contact cells that have
plenty of collection wire on the face on a positive ground will not
significantly increase yield over a negative ground.
Are there other benefits to running positive ground that I am not aware of?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Doug Pratt
Sent: Saturday, September 20, 2008 5:25 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] evergreen panels diode problems
Jay, there was a bulletin from Evergreen earlier this year about their
modules being used in positive ground systems. I don't remember the exact
details (and I'm not at work now), but the gist was avoid positive ground
till we make some modifications. Please check w/Evergreen on Monday.
-Doug Pratt
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