Laser inquiry [RE-wrenches]

[Travis Creswell, Ozark Solar]

I like the BP585's  and 590's that I've used. They do seem to perform very
well but I can't prove they are performing better than anything else.

Another benefit of the higher power point voltage could be the increased
output in summer when the stuff with lower PPV is really getting hurt by the
heat.  This laser groove stuff was invented in Australia by the way.

I can't rattle off the decrease in volts for every degree Celsius but I have
seen it before and it is rather significant.  By the way, amps goes up with
heat, if I'm not mistaken, but the decrease in voltage more than offsets
that increase and you get lower watts.

Bill Brooks are you reading this?  What would the OCV of a typically
crystalline cell be on a 100 degree (F) day?  Of course that means that the
panels themselves are easily approaching 140.  Do you have a "rule of
thumb"?

Travis Creswell
Ozark Solar.
----- Original Message -----
From: "Bob-O Schultze, Electron Connection" <econnect at snowcrest.net>
To: <RE-wrenches at topica.com>
Sent: Saturday, March 31, 2001 9:37 PM
Subject: Re: Laser inquiry [RE-wrenches]


> Yo Sharkey,
> I don't know the mechanics of HOW it does it, but the laser grooving
> method gives a higher cell voltage than single or multicrystal cells.
> Doesn't do anything for extra current however.  You you get a module
> that is rated a 18.5V instead of 17V at the power knee. Since the
> manufacturers figure the selling price based on peak V X A = Watts,
> what would be a 75W Siemens, for example, comes out as an 85W BP
> laser grooved. Hence, the extra bucks. The extra voltage might come
> in handy in a place where it is overcast a lot. It might come in
> handy in an array direct application like water pumping. And, it
> might buy you something if used in conjunction with a good MPPT
> charge controller. Is it worth the extra dough? I don't think so, but
> then I'm a Siemens kinda guy too. Some folks like Fords, others
> prefer Chevy or Dodge.
> Bob-O


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