• Solar Power System Update

    For those following along with the solar power system. Today was the highest peak production day so far peaking at 2.5KW. Pretty good for a nominal 3kW system in the middle of winter at a non-ideal angle and not peak time of the day. Recent weather has been awful, but the system still produces usable energy on dark heavily overcast and rainy days.
    You can follow the daily stats here:

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      • Allan

        How much electric power do you predict your system will produce at noon on the summer solstice ?

        • JP

          May not be as much as you think. The heat can have a detrimental effect and production can suffer. The longer days do typically produce a bit more power but the peak value will be much less due to the temps.

        • How much cloud? How much solar radiation?

      • David

        Non-clickable links! Fix it 😛

      • Erik vanBaarle

        I would expect an efficiency to be a unitless quantity however the plot states it as being kWh/kW so it has dimension hours. How should I interpret this figure?

      • Nick

        An interesting observation would be to check what is the average production during winter and compare it with the average value during summer. I believe you will be surprised to see that during summer, high temperatures will bring down the efficiency of solar panels, although light levels will be higher.

        • Yes, solar radiation on average is higher, and the days are longer, so should produce more total power per day. How much more, I don’t know.

      • Deephaven

        Why have they used a lower case k for their units? Should be K for Kilo.

        • Alber

          No, that’s not correct. It’s lowercase ‘k’ for kilo, uppercase ‘K’ for Kelvin (temperature unit).

        • millem23

          In the MKS system, a lowercase ‘k’ is the correct prefix for kilo. For example: kHZ, kg, etc.

          • millem23

            whoops – correction…’kHz’. (I capitalized the z in the previous post!)

            • Deephaven

              Yeah what an idiot I am – my excuse is that it was Monday morning!

      • adamhixon

        Do you have any numbers worked out yet as to how long until it pays it self off?

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