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Thread: Step-Up to Step-Down Transformer Winding Configurations

  1. #31
    Join Date
    Jun 2004
    Location
    Cherry Valley NY, Seattle, WA
    Posts
    3,501
    Yes please share your conclusions, it is very useful information.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  2. #32
    Join Date
    Jun 2004
    Location
    Cherry Valley NY, Seattle, WA
    Posts
    3,501
    Quote Originally Posted by Milo902 View Post
    That's my experience as well. I have been mulling over the idea of grouping the inverters at the switchgear as a possible alternative. Although wire costs and line losses will probably be a wash, it moves some of the AC losses to the DC side and solves my concerns about excessive voltage drop/rise on the AC side. It would require combiner boxes at the arrays with a disconnect, but if I'm considering a voltage regulator on the AC side to help with voltage drop, it's probably a cheaper option (and certainly a simpler.
    Having combiners at the array may not be such a bad thing. I am an installer, so I look at things largely from a ease of installation standpoint. One idea I have contemplated and would like to try is combining in the array. When we do several meg groundmounts, we pull a ton of #10 and #8 strings through the array. To the inverters. Last system we had 28 wires pulled through, and that was only half of a east west row. The other half was piped underground. It's just a big hassle dealing with so many wires, keeping track of them, tangles, setting up and moving the spools, etc. So I thought about combining say one inverters worth of strings then running a single pair back to the inverter. Another advantage besides ease of management, is you could use aluminum pv wire for the large combined dc run which would lower wire costs substantially. So i think that would lower material and labor substantially. That strategy flows nicely into a long dc run. Anyway, another idea.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

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