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  • Virtual tracking

    As I understand it virtual tracking the sun in summer.
    gains longer production.

    ​​​​​much less production in winter than summer.

    I use 2 systems 1 380 mppt array set due south.
    And 1 400 watt array on pwm.
    ​​​​
    In the winter mornings during bulk would I benefit by aiming the 400 watt array sse?






  • #2
    Originally posted by Ho jo View Post
    As I understand it virtual tracking the sun in summer.
    gains longer production.

    ​​​​​much less production in winter than summer.

    I use 2 systems 1 380 mppt array set due south.
    And 1 400 watt array on pwm.
    ​​​​
    In the winter mornings during bulk would I benefit by aiming the 400 watt array sse?




    If that 400w array was going through a MPPT CC then yes. Since it is going through a PWM CC you are already losing about 33% of the total panel wattage so the increase from the aligning the array to the sun would be minimal.

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    • #3
      I'd guess that you would be better off aiming ESE and elevating the panel 15 degrees more than your latitude.
      Last edited by littleharbor; 11-07-2019, 05:40 PM.
      2.2kw Suntech mono, Classic 200, NEW Trace SW4024

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      • #4
        @littleharbor Just to be clear in Dec sun rise is 120° what degree setting ese would you recommend?
        ​​
        Last edited by Ho jo; 11-07-2019, 08:45 PM.

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        • #5
          I'm no expert here but I would think something in the 130 to140 degree Azimuth would work.
          Funny, the sun rises well north of 90 degrees, East, in my neck of the woods on he first day of summer the sun needs to get pretty high before it hits my, due South, fixed array. Way up north I would guess a dual axis tracker would work great to chase the sun around the sky in the summer
          Last edited by littleharbor; 11-08-2019, 12:41 PM.
          2.2kw Suntech mono, Classic 200, NEW Trace SW4024

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          • #6
            Originally posted by littleharbor
            Funny, the sun rises well north of 90 degrees, East, in my neck of the woods on the
            first day of summer the sun needs to get pretty high before it hits my, due South, fixed array. Way up north I
            would guess a dual axis tracker would work great to chase the sun around the sky in the summer
            It sets to the North as well. This is part of why an array facing East and another array facing West can
            collectively keep inverters, etc busy for long hours. Same applies when the sun rises and sets so far
            South half a year later. Bruce Roe

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            • #7
              @bcroe IIRC correctly you have spent many hours testing different pv angles.
              Winter solstice here is 31°.
              sunrise is at 120° azimuth.
              ​​​​​​​with such low angles and narrow sun path.
              In your opinion is there any advantage to aim other than due south?

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              • #8
                You will need to model what is best for you. The theme here at 42 deg Lat is to
                double up panels to make a lot more KWH under our ever present clouds. Having
                done that, the panels are E and W to give a long productive day instead of just
                going into big clipping, under good sun. If clouds are not common for you, a straight
                south orientation (with fewer panels) will get the most KWH per panel.

                A common event here is good sun in the earlier AM, then clouding over towards noon.
                I have the advantage of utilizing good sun to the max at any time it occurs.

                Another possible need, is to have as along a battery charging day as possible.
                Bruce Roe

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