storage batteries

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jurgie

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storage batteries in a solarvoltaic system shall be provided with a minimum work space depth of what?
24 or 30 inches ? would like to know article number also.
 
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dan55

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South Dakota
george how did you come up with 36 inches without voltage, because if voltage is over 151 to 600 could it not be 42 in condition 2
 
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dan55

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this is a question that has been on some renewal exams , colorado for one, and all that i am saying is can it is the question has incomplete information , yes that answer is right if the system is under 150volts , but shouldn't the exam question be more specific.
 
George Stolz

George Stolz

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cpal said:
I agreed with George. Yes!
Click to expand...
LMAO

I just saw this thread again, just now. I have to say, Dan, I tried really really hard to come up with something to shoot that down, and after my efforts I have to agree that the question is badly worded. :cool:

Chances are, the test-writer assumed just like I did that all solar system batteries were restricted to 48 VDC, but that is only so for dwelling units. :)

And seriously, Article 690 is such a jacked-up mess, I can't hardly blame anyone for confusion. For example:
  • Look at 690.71(B).
  • Now look at it's exception.
  • Now, to make sense of the exception, we have to go to 690.7.
  • 690.7(A) is called "Max PV system voltage" but essentially says, the max is the max the system will put out at an ambient.
That's like saying the speed limit is 55, with the exception being if you're a good driver it's what the car will do.

Granted, I'm being a bit of a smart aleck, because more relevant rules follow in (B) through (E) of 690.7. But the subsection should be called "Calculating Nominal System Voltage" or something, it's current title is hopelessly misleading and frustrating. We are made to wade through a thick paragraph of crud that has absolutely nothing to do with what we were sent there for.

It's code-writing at it's worst, IMO. I know Wiles went crazy on Article 690 for the 2008, but I haven't had any time to really read any of his proposals. Hopefully, they were mainly changes to advance clarity, because this ranks among the worst areas of the code at this time, IMO.

Then again, it very well could be that the areas of the code I don't understand frustrate me, and I blame the book instead of my lack of knowledge of it; that could be the case. Anyway, enough of my rambling. :)
 
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