What you will see

  • A lower or flatter peak on the daily curve.
  • Sharp notches in the curve at the same time each day.
  • One string reading lower than the others, if your app shows strings.

Why it happens

Dust and new shading are the most common causes. Regular notches at the same time each day are usually a shadow from something new: a water tank, a mast, a tree that has grown or a neighbour’s new floor.

Heat derating flattens the peak on very hot days. A string reading clearly lower than its neighbours points to a panel, connector or cable fault.

What you can check yourself

  • Compare the curve on a clear day with an older clear day.
  • Walk around at the time of the dip and look for shadows on the panels.
  • If your app shows string or MPPT values, screenshot them at midday.

What not to do

  • Do not disconnect strings to test them.
  • Do not climb onto the array to look.

When to call us

  • The drop is more than you can explain by dust or weather.
  • One string reads clearly lower than the others.

Output checks in Faisalabad and Lahore

New water tanks, masts and extra floors on neighbouring houses are common causes of new shading in Punjab cities. Send us old and recent clear-day curves and we will compare them.

Send us

Screenshots of an old and a recent clear-day curve, string values if available, and a photo of any new shading.