Trace PV series DC grounding [RE-wrenches]

[Bill Brooks]

Eric,

Got to look at worst case in the U.S. code. Not sure how Canada code treats
the high voltage end of the voltage. In the U.S. if it can get below -5
degrees F, you have to use a full 1.25 multiplier on your overall open
circuit voltage. There are only a few places in Canada that cannot get that
cold (Vancouver). Vancouver would use a 1.17 correction factor according to
the 1999 NEC Article 690 (-4 to 13 F). If you are using a crystalline module
with a Voc of 22.0 Volts, the code only allows 23 modules in series. It is
different for every module.

Bill.


> -----Original Message-----
> From: Eric Smiley [mailto:Eric_Smiley at bcit.ca]
> Sent: Thursday, March 15, 2001 11:41 AM
> To: RE-wrenches at topica.com
> Subject: RE: Trace PV series DC grounding [RE-wrenches]
>
>
>
> Thanks for the feedback. Fortunately, not all of Canada is covered in
> snow and ice. Vancouver has a relatively mild climate. But I will be
> sure to do the calculations.
>
> >OOps, you live in Canada. Not sure what to recommend for you. Code will
> not
> >allow more than 22 modules in series on this inverter in cold climates
> which
> >is too low an operating voltage on a hot summer day. Good luck.
>
>
> ----------------------------------------------------------------------
> Eric Smiley
> Project Leader - BCIT Technology Centre
> Photovoltaic Energy Applied Research Lab (PEARL) - BCIT
> ph: (604)432-8657 www.bcit.ca/~tc/pearl/index.htm
>
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____________________________________________________________
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Newsletters, Tips and Discussions on Topics You Choose.
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