Date:         Thu, 8 Aug 2013 13:19:28 -0700
Reply-To:     neil n <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil n <musomuso@GMAIL.COM>
Subject:      Re: Electrical Math Check Please? (Westy Solar Panel)
Comments: To: David Beierl <dbeierl@attglobal.net>
In-Reply-To:  <5203f755.86743a0a.0ce0.1fbc@mx.google.com>
Content-Type: text/plain; charset=ISO-8859-1

Thanks David.

One other related aspect of this install, is where I'll run the cable
from panel to controller. I'm using this:

http://images.thesamba.com/vw/gallery/pix/1030185.jpg    as a
template.  The holes in the poptop appear to be sized for the OD of
the cable itself, not the MC4, so had to wonder if that person
disconnected the cables from the junction and ran them back up etc.

The cable attached to the panel is more flexible than the supplied
flat #10/2 cable. ('twas a kit) OTOH, I don't think there's any great
danger that repeated up/down of poptop will cause the wire strands in
the flat cable to fail any time soon.


Neil.


On Thu, Aug 8, 2013 at 12:53 PM, David Beierl <dbeierl@attglobal.net> wrote:
> At 02:44 PM 8/8/2013, neil n wrote:
>>
>> So adding 3' of wire(s) causes a voltage drop of 0.03 Volts?
>
>
> Checking a few different tables I'm getting closer to 1.0-1.1R/thousand feet
> for #10 at room temperature, but yes, you're doing the arithmetic correctly.
>
> Assuming .03 volts and 8 amps, that three feet of wire will dissipate I^2xR
> = 64 x .03 = 1.9 watts.
>
>



--
Neil n

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