100 watt solar panel, how much power it generates?

As name says, a 100W solar panel is capable of generating up to 100 watts of power under ideal conditions.

This is 100 watts per hour. However, the actual amount of power it generates will depend on several factors such as:

  1. The amount of sunlight the panel receives: The power output of a solar panel is directly proportional to the amount of sunlight it receives. A 100W solar panel can generate 100 watts of power under full sunlight or around 5-6 hours of equivalent full sunlight per day.
  2. The angle and orientation of the solar panel: The angle and orientation of the solar panel affects how much sunlight it receives. Ideally, the panel should be installed at an angle and direction that maximizes its exposure to the sun.
  3. The temperature: Solar panels generate less power in hot temperatures. The hotter the panel gets, the less power it produces.
  4. The efficiency of the solar panel: The efficiency of a solar panel is the percentage of sunlight it converts into electricity. The higher the efficiency, the more power the panel can generate.

So, the actual amount of power a 100W solar panel can generate will vary depending on these factors. Generally, you can expect a 100W solar panel to generate around 400-600 watt-hours (Wh) of energy per day in summer.

Solar panel rating

To explain this in more detail first thing is to understand solar panel rating. A solar panel is rated by the amount of power it creates at standard test conditions (intensity of the sun, angle of the light, temperature, etc), which we can also say are the ideal or lab conditions. For example, a 12 volt solar panel rated at 100 watts generates 100 watts at those standard test conditions.

So how much power the solar panel will generate in a day? Even though, we see daylight early in the morning and late in the evening, the power production is not even during those hours. Daylight from 6AM until 8PM will not generate 14hours x 100w of power from this 100 watt solar panel. If the intensity of light (sun) is low, e.g. in the morning, the efficacy of the panel is also low. So during the morning hours or during cloudy times the efficacy might be at half or even less of that 100 watts solar panel.

So during summer days you can expect around 400-600 watt hours of energy a day from that pane