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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Renewable Energy: What size conduit for 10 PV panels?

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    I am planning to fit two rows of five 250W PV panels, sometime in the future, and need to know what diameter conduit to fit for all the cabling from the roof. Any ideas?
    • CommentAuthortony
    • CommentTimeMay 14th 2014
     
    how long will the cables be? 40mm will do it possibly 25mm
    • CommentAuthorbillt
    • CommentTimeMay 14th 2014
     
    Depends on configuration. Normal would be one string of 10 panels in series, in which case you'ld be using 2 x 4mm wires to the inverter, if it's reasonably close. That should go through standard 20mm conduit.
  4.  
    My experience is simple: don't fart around - make it bigger or bigger still. The number of times I've offered either a silent prayer of thanksgiving or a a 4 letter word of pain when later in an unforeseeable situation I just need a route through....
  5.  
    Posted By: GotanewlifeMy experience is simple: don't fart around - make it bigger or bigger still. The number of times I've offered either a silent prayer of thanksgiving or a a 4 letter word of pain when later in an unforeseeable situation I just need a route through....

    I followed this plan and put in a 50mm diameter conduit, which should hopefully make it a doddle to pull through cables in the future.
  6.  
    2 x 20 or 1 x 25mm will take 4 x 4mm cables easy ( 2 strings +/- )
  7.  
    Thanks for all the answers. It's only 4m from the roof to where the inverter will be and more or less straight. So if I wire them in series I'll need two 4mm2 cables. I've got some 25mm conduit so I'll use that. Thanks again.

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