[RE-wrenches] Fuse Sizing

[Dean T. Newberry]

Hello William,
Your voltage drop calculator matches this one for DC, but not for AC and 
3 phase
http://www.nooutage.com/vdrop.htm
Check his source code and notice that he just uses a look up table.

You might add a note to the sheet.

I updated the spreadsheet http://www.dcn.davis.ca.us/GO/deant/EnergyCalc.xls
It is corrected for atmospheric thickness in easterly and westerly 
orientations.
I added a tracker button, it overestimates tracking about 20% so don't 
rely on that for now.

cul deant

William Miller wrote:
> Jason:
>
> Close, but I think you have multiplied by one too many Isc.  For an 
> excellent description of the process, see the white paper by Berdner, 
> now on our web site at:  http://mpandc.com/resources/resources.html.  
> Remember, you need to be able to put your hands on a no-back-feed 
> certification if asked.
>
> Wm Miller
>
>
> 12:22 PM 11/20/2008, you wrote:
>> All,
>>
>> My understanding on fuse sizing, when needed or to determine if they 
>> are needed, is to take the ISC of the module and multiply it by 
>> quantity of strings minus 1 and then multiply by 1.25 and multiply 
>> again by the ISC to give the amps of the system and if you go over 
>> the module fuse rating you need to fuse all strings.
>>
>> I have had tow conflicting views today on this so I'd love any feed 
>> back asap.
>>
>> Thanks,
>>
>> -- 
>> Jason Lombard CSBA
>
>
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-- 
Dean T. Newberry
Talbott Solar & Radiant Homes Inc.
430 D Street
Davis, CA 95616

T: 530 219-3606
F: 530 758-8187
E: deant at talbottsolar.com
W: http://www.TalbottSolar.com/
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