41 comments

  1. I believe you meant open-circuit. Short-circuit produces high current, it doesn’t reduce it. But great demonstration overall.
    This is the down side of a series connection. Thanks for sharing

  2. It depends on how many by-pass diodes the panels have. Canadian Solar uses half-cut cells and has more columns. They put a by-pass diode on each column. Allegedly, Sunpower has a by-pass diode across each cell.

  3. Had the same issue on my Vw T5. When the roof box is on, the top row is shaded and it killed the whole system. Great video 👍🏻

  4. Man alive, brother. Thanks for posting. Was contemplating 100W on the hatch of my boat – which is almost always 1/2 shaded by the sails. Saved me a ton of grief wonder why the panel doesn't work.

  5. Why do they make solar panels in series instead of parallel? (It seems this is a really common problem)

  6. If the cells on the panel we're to be wired in parallel, would the amperage drop significantly or minimally? Thanks

  7. I agree…shading does impact performance. However there are many other factors that affect output…esp with wiring for series, parallel, or combination thereof. I actually tested this with my pergola panels that are shaded in the morning. Simply rewiring the strings east-to-west instead of north-south increased their output despite shading. The MPPT finds the VOC for each string and then locks in for best power. I did a video on my channel. Overall…100% agree that shading/dirty panels/bird crap/anything that covers those cells are going to kill your output. However, there are way to maximize your output if you can't avoid it.

  8. Thanks… Very useful… I'd like to know how much loss there is, if the angles are off ?  My panels are on a power pole and perpendicular to the ground.  Can you do the same experiment, but how much loss by poor angle?  Thanks, Good Luck, +Blessings

  9. **PLEASE HELP**
    I am trying to set up my own VAWT to generate power. I haven't been able to find the answer for this anywhere, but does polarity matter in the three phase ac induction system? I'm doing a 9 coil, 18 magnet (across 2 rotors) setup. In all the diagrams, however, it doesn't show whether or not the polarity of the magnets in relation to the clockwise/counterclockwise winding on the coils affects voltage and current. If you can help me, it would be greatly appreciated!

  10. WOW – your solar panel not even being used, is just as bad as being in the Shade! I've always thought individual solar cells should have schottky diodes in parallel. "Shorting" not the correct term here at all, that is the oppsite of what is happening, it's limiting the shade is like a variable resistor limiting the current, NOT SHORTING.

  11. Thanks for the education. I had no idea a little bit of shading would have such a drastic effect… really appreciate the info.

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