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    #16
    Originally posted by five.five-six View Post
    So, I did find a local outfit who produced a submittal package for me for $250

    I looks very good and I expect it will sail through plancheck.

    The. Only thing is that I had given them drawings with 3 strings of 9 modules for a total of 27

    the drawings they returned had 1 string of 14 and another string of 13.

    They said that SolarEdge will work wit different sized strings.
    They are correct, and most SolarEdge inverters do not have fused inputs. If you have three strings, many AHJ's will insist that you fuse them, even though Solar Edge says it isn't required. They did you a favor.

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      #17
      Originally posted by five.five-six View Post
      So, I did find a local outfit who produced a submittal package for me for $250

      I looks very good and I expect it will sail through plancheck.

      The. Only thing is that I had given them drawings with 3 strings of 9 modules for a total of 27

      the drawings they returned had 1 string of 14 and another string of 13.

      They said that SolarEdge will work wit different sized strings.

      Were these stamped drawings for $250?

      my god if PE's are stamping drawings for 250 bucks I don't want to live in this country anymore

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        #18
        Originally posted by Designer69 View Post
        Were these stamped drawings for $250?

        my god if PE's are stamping drawings for 250 bucks I don't want to live in this country anymore
        Plenty of PEs out there who are running stamp shops. A contractor once told me of a PE up in Napa who was retired who would stamp his plans for a few bottles of good wine. Very hard to find and prosecute stamp shops too.

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          #19
          Originally posted by ron View Post
          Wow, Engineering is pretty cheep in your area. Do they sign/seal the drawings too?
          Oh, I am not talking about engineering or stamps.

          $300 for a DRAWING. By a drafter.....an Autocad jockey or architect is sufficient.

          Their job isn't to know what the contractor or engineer needs to calculate or to know much about design and calcs, just to organize it pretty like.

          We only need an engineer if tilted rack (wind loads), sub standard roof framing or custom racking.

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            #20
            KISS solution

            Single line diagram: A single line diagram is not a complex thing. I made some objects in MS Powerpoint PPT (panel, array, conductors, combiner) and I just copy and paste for the systems that I have designed.

            Drawing panel layout: I capture an image from Google Earth (GE) and use the measurement tool in that app to get the roof dimensions. I create a panel of the appropriate size (you need a little trig here because the roof rake) and copy and paste. I scale it to 1/100 (e.g., a 40" panel in landscape is 0.4"; the other dimension on a 6 and 12 roof is 60" in plan view (0.6" in PPT) for a 67" panel, in Excel the calc is: Plan Dimension =Panel Length*cos(atan2(12,6)); for a 3 and 12 roof, Plan Dimension =Panel Length*cos(atan2(12,3)) ). Use the Align and Distribute tools in PPT to neaten up the drawing after the approximate layout is complete. Panel gets pasted on top of GE image.

            Designing panel layout: National Renewable Energy Lab (NREL) has tools that allow you to compute power at various latitudes and array orientation. Then you have to consider the potential for shade and the use of string versus microinverters. For example, I have one string where a few panels have reduced output at times due to shading from a chimney, and another string with late afternoon shading, on a few panels, from a tree. I went with microinverters to eliminate and overall 10 - 20% reduction on those strings that would have resulted if I went with string inverters. I also like the microinverters because of the safety factor, ease of design and panel level monitoring.

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              #21
              Additional details

              Additions:

              Racks on roof: Ironridge has an app that will compute the loading for their product. If you have rafters you may be fine using that. I made a little spreadsheet with their calcs to paste into PPT. Sometimes with trusses modifications are needed for lift. I have designed for both.

              Electrical: One needs to do the calcs to decide on the wire size, voltage drop, etc.

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                #22
                Originally posted by Designer69 View Post
                Were these stamped drawings for $250?

                my god if PE's are stamping drawings for 250 bucks I don't want to live in this country anymore

                Turns out I need stamped drawings and structural for this municipality. They are accepting electronically stamped and it’s costing me $650 for both sets. I print them.

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