wire sizing at Higher voltages [RE-wrenches]

[Jay Peltz, Peltz Power]

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Hi Ray,

I'm curious about just how far are you trying to run this wire? #4 using a
SMA?

And what voltage drop are you trying to get?

thanks,
jay

Peltz Power

----- Original Message ----- 
From: "Ray Walters" <ray at solarray.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, April 20, 2004 5:05 PM
Subject: Re: wire sizing at Higher voltages [RE-wrenches]


>
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> HI Joel, Ron, & all;
>
> Seems like the terminals should go up to a #4 Ga, if SMA's recommendation
> is to size for less than 1%. The reason I asked in the first place is that
> extra splices to land an oversized wire on small lugs cost extra money and
> eats into our savings from over sizing in the first place.
> Ron, I'm glad I'm not the only one sizing for power drop. I got into it
> years ago when the cost of keeping to a 2% volt drop on 12 volt systems
was
> getting outrageous. (200 watt array on 2/0 cable??) I had to convince
> myself before I could convince my customers that it was worth it.( It
> wasn't) I have some arrays on non MPPT controllers and we're letting volt
> drop go as high as 10%. It just wasn't cost effective, and without MPPT
you
> don't really see that extra power anyway.
> Another funny thing that came out of the calculations I was doing: it
> didn't matter how short the run was. If you could save 1 watt on a 5 ft
run
> by oversizing it, it was worth it. (Not of course if the lugs or conduit
> can't take it)
>
> Sincerely,
> Ray
>
>
>
> >Ray,
> >Interesting discussion. From the SMA web site:
> >  SMA America recommends sizing the PV wired to keep the voltage drop
> >below 1%.
> >  In
> >any case, the DC terminals in the Sunny Boy Inverter will only accept up
to
> >10 AWG wire.
> >Best regards,
> >Joel Davidson
>
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> Bounces like rubber! Shatters like ceramic! Discover Crazy
> Aaron's Thinking Putty in grown up handfuls. It's the
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