[RE-wrenches] evergreen panels diode problems

[jay peltz]

HI Mark,


I've seen a paper from Sunpower that shows their modules are OK for  
lower voltages, but above a certain voltage ( around 200 or so) they  
start to see the static build up, but interestingly only on the panels  
at the high end of the voltage.

I haven't seen anything to indicate that other panels will see an  
improvement with doing positive ground, if I understand what you are  
saying?

But I will forward on the information to the telecom in question.

thanks,

jay

Peltz power
On Sep 20, 2008, at 5:36 PM, 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
>
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>