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  • Solar Power System Update

    Posted on June 30th, 2013 EEVblog 13 comments

    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.
    http://pvoutput.org/intraday.jsp?id=22501&sid=20402&dt=20130630
    You can follow the daily stats here:
    http://pvoutput.org/list.jsp?userid=22501

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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.

      • http://www.eevblog.com EEVblog

        How much cloud? How much solar radiation?

    • David

      Non-clickable links! Fix it :P

    • 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.

      • http://www.eevblog.com EEVblog

        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?