[RE-wrenches] evergreen panels diode problems

[Marv Dargatz]

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: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] 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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