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.
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 😛

    • 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?

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