How many kWh does a solar panel produce | Solar panel wholesaler

How many kWh does a solar panel produce

Solar panels (affectionately referred to as “PV panels”) are used to convert sunlight, which is composed of energy particles called “photons,” into electricity that can be used to power electrical loads.

As a general rule, with an average irradiance of four peak sun hours per day, 1 watt of rated solar panel power produces approximately four watt-hours (Wh) of energy. This is equivalent to 0.004kWh, which means that a 300-watt solar panel will generate 1.22kWh per day. The precise amount is determined by the irradiance of the location.

In 2020, the average American home used 10,715 kilowatt-hours (kWh), or 893 kWh per month. If you want a solar system to power your entire home year-round, you’ll need to install a system that can supply all of these energy needs.

The actual output of each solar panel is also dependent on a variety of factors, including your location, local weather conditions, as well as the angle and direction in which the panels are installed.

How many kilowatt-hours (kWh) does a solar panel generate?

The amount of energy generated by a solar panel is highly dependent on the irradiance measured in kilowatt-hours per square meter per day (kWh/m2/day) at the panel’s location.

It is also referred to as the location’s Peak-Sun-Hours and can be used to quickly estimate a solar panel array’s daily or annual output in kWh.

This is a significant number. For instance, the energy output of a solar panel in Arizona, which receives 7.5 peak sun hours per day, is significantly different than in Indiana, which receives three!

How much electricity is generated by a 1 kW solar panel system?

A solar panel system of 1 kW can generate approximately 850 kWh of electricity per year.

The following factors affect the amount of electricity generated by your solar panels:


The maximum amount of electricity that the system can generate in ideal conditions (referred to as ‘peak sun’).

Occasionally referred to as ‘rated capacity or ‘rated output,’ this is assumed to be 1,000 watts (or 1 kW) of sunlight per square meter of the panel.

The majority of domestic solar panel systems range in capacity from 1 kW to 4 kW.


The amount of sunlight that solar panels can convert to electricity.

Because solar panel operating conditions are never ideal, they will never be 100 percent efficient. Indeed, the majority of residential solar panels operate at a maximum efficiency of around 20%. Panels with efficiencies of 40% to 50% are available, but they are typically prohibitively expensive.

Solar panels with a higher efficiency typically cost more but require less roof space.


The material used to construct a panel can also affect its efficiency.

  • Monocrystalline panels make the most efficient use of output and space due to their use of higher-grade silicon.
  • Polycrystalline panels are slightly less efficient than monocrystalline panels but are less expensive to purchase.

Final Words

A typical solar panel system in the U.S. is around 6 kW in size, or between 16 and 18 solar panels, depending on their wattage. A 6 kW system will generate somewhere between 720 kWh to 900 kWh per month. The average American household uses about 893 kWh of electricity monthly.

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