wire... insults that is.... [RE-wrenches]

[Ray Walters]

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>Hey Geoff,

I took your advice and I think I'll be able to add that NABCEP certificate 
to my degree in engineering. Did you actually have some constructive 
criticism or technical comment to make or were you just being goofy?
I was using the 2% rule for PV array wire sizing back in the 80's, and I 
thought now it was time to progress.
There basically are two different approaches: the electrician checks volt 
drop, the engineer takes it to a full project lifetime benefit-cost 
analysis. We both start with Ohm's law.
For PV arrays, its really NOT volt drop, its power loss. Volt drop is more 
of a load side concern, where certain equipment malfunctions if the voltage 
sags too far below its nominal input rating. We have always just used the 
same calculations for lack of nothing better.
My job is to question, push the envelope a little, and get you guys to 
think outside the box sometimes. To really bring solar into the mainstream, 
we have to continue to improve the longevity and energy output of our 
systems while bringing DOWN the cost. My previous posts were meant to open 
a dialog.
I welcome your input, corrections, mild insults, etc., just back your 
statements up with some facts.

Thanks,

Ray Walters



>Ray - keep your head in that NEC book a wee bit longer...
>
>
>
>Sincerely,
>
>Geoff Greenfield

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