02/24/2022

**When you need to buy the solar panel, there are many thing you want to know in many time. Here, we would like here. In this post, i would to introduce that how many kwh does a solar panel produce per day, hope it useful.In fact, with an average irradiance of 4 peak-sun-hours/day, 1 watt of solar panel rated power will produce on average 4 watt-hours (Wh) of energy. This amount equates to 0.004kWh, so a 300 watt solar panel will generate 1.22kWh/day. The precise amount depends on the location irradiance.**

The amount of energy generated by any solar panel depends heavily on the irradiance for the panel’s location measured in kilowatt-hours per square meter per day (**kWh/m2/day**).

For convenience, it’s also known as the location’s **Peak-Sun-Hours **and can be used as a quick estimated of a solar panel arrays **output per day** or year measured in kWh.

It’s an important number. For example, the energy output for a solar panel in Arizona with of **7.5** **peak-sun-hours/day** is very different from Indiana with **3/day!**

**With an average irradiance of 4 peak-sun-hours 25 solar panels rated at 300 watts each would be needed to produce 30kWh per day. This equates to a 7.5kW solar power installation. The solar output will vary depending on the irradiance at any particular location.**

Domestic 200w solar panel can have power ratings anywhere from **200** watts to **350 watts.**

Lower rated panels such as the very common 100 watt variety are mainly used for small projects, local battery charging, camping vans/RVs, sheds and pergola roofs.

Let’s say the panels in question are **300 watts.** I’ll also choose the location of the panels as** Atlanta, Ga.** Other factors, such as voltage, doesn’t really matter.

**With a typical irradiance of 4 peak-sun-hours 62 solar panels rated at 200 watts each are required to produce 50kWh per day. This is equivalent to a 7.5kW solar power system. Solar output is dependent on the irradiance at any geographic location.**

Home-mounted solar panels normally have individual power ratings from **175** watts to **400 watts.**

Smaller panels below 200 watts tend to be used for smaller projects, such as battery charging, emergency power supplies, RVs, or garden structures like pergola roofs.

For this example I’ll use **200 watt panels** with an average irradiance value of **4 peak-sun-hours.**

**With a typical irradiance of 4 peak-sun-hours 13 solar panels rated at 200 watts each are required to produce 10kWh per day. This is a 2.5kW solar power system. Solar output will vary according to the irradiance for any geographic location.**

I’ll stick with the **200 watt panels** used in the last example and average irradiance of 4** peak-sun-hours.**

I already worked out that a 200 watt solar panel can generate:

4 peak-sun-hours x 200 watts = **0.8kWh/day**

Dividing 10kWh by the **0.8kWh/day** we will find the number of solar panels needed:

10kWh/0.8kWh = 12.5 (13) 200 watt** solar panels**

The total kW needed is **2.5kW.**

**Note:** Remember to increase the overall capacity of the solar array to take into account the **23% solar system losses** commonly associated with domestic solar systems.