How Many Panels In 1kW, 3kW, 5kW, 10kW, 20kW Solar System? (Easy)

Alright, figuring out how many panels you need for different sizes of solar systems is really easy. We will show you how to determine the number of panels needed for any solar system. On top of that, we created a spreadsheet for a number of 100W, 200W, 300W, and 400W solar panels needed for 1kW, 3kW, 5kW, 10kW, and 20kW solar systems (check the chart further on).

This is a basic mathematics game. All you need to do is sum up all the panel wattages to come to the solar system size (this just sounds a bit complex).

Let’s demonstrate how simple it is. Take, for example, a 5kW solar system. The summary of all the solar panel wattages in a 5kW system should be 5000 watts (since 5kW = 5000W). Usually, we use the most common 100W, 200W, 300W, and 400W PV panels for this kind of system. Here are the number of panels you will need:

  • If you are using only 100-watt solar panels, you will need 50 100-watt solar panels for a 5kW solar system (since 50 × 100 watts = 5000 watts).
  • If you are using only 200-watt solar panels, you will need 25 200-watt solar panels for a 5kW solar system (since 25 × 200 watts = 5000 watts).
  • If you are using only 300-watt solar panels, you will need 17 300-watt solar panels for a 5kW solar system (17 × 300 watts is actually 5100 watts, so this is a 5.1kW system).
  • If you are using only 400-watt solar panels, you will need 13 400-watt solar panels for a 5kW solar system (13 × 400 watts is actually 5200 watts, so this is a 5.2kW system).

Quite simple, right?

You can also mix solar panels with different wattages. Example: For a 10 kW solar system, you can use 33 300-watt PV panels (9900 watts) + 1 100-watt solar panel to bring the total up to 10,000 watts or 10kW solar system.

How Many Panels In 10kW Solar System
This is a 10kW solar system. We see 16 300-watt panels on this side of the house (4,800W), and there are 16 300-Watt PV panels on the other side (4,800W). To top it up to 10kW, we need an additional 400W solar panel on the balcony.

Here is a simple equation that will help you estimate the number of solar panels needed for differently-sized solar systems:

Number Of Panels = (Solar System Size In kW × 1000) / Solar Panel Wattage

For example, if you want to install a 3kW system, and are wondering how many 300-watt solar panels to use, you can just use the above formula like this:

Number Of Panels (3kW System, 300-Watt Panels) = (3kW × 1000) / 300W = 10 300-Watt Solar Panels

You can see that you need 10 300-watt solar panels to construct a 3kW solar system. If you don’t get the full number of solar panels (you get 15.67, for example), just round it up (to 16 in this case).

You can do this calculation by hand or using a hand calculator. To make things even easier, we have calculated the number of solar panels needed for the most common solar system sizes (1kW, 3kW, 5kW, 10kW, and 20kW), and summarized the results in this chart:

Number Of Solar Panels Needed For Solar System Chart

We are using the most common solar panel wattages; 100-watt, 200-watt, 300-watt, and 400-watt PV panels. Here is how many of these solar panels you will need for the most commonly-sized solar panel systems:

Solar System Size (kW): Number Of 100-Watt Solar Panels Needed: Number Of 200-Watt Solar Panels Needed: Number Of 300-Watt Solar Panels Needed: Number Of 400-Watt Solar Panels Needed:
1kW Solar System: 10 100-Watt PV Panels 5 200-Watt PV Panels 4 300-Watt PV Panels 3 400-Watt PV Panels
3kW Solar System: 30 100-Watt PV Panels 15 200-Watt PV Panels 10 300-Watt PV Panels 8 400-Watt PV Panels
5kW Solar System: 50 100-Watt PV Panels 25 200-Watt PV Panels 17 300-Watt PV Panels 13 400-Watt PV Panels
10kW Solar System: 100 100-Watt PV Panels 50 200-Watt PV Panels 34 300-Watt PV Panels 25 400-Watt PV Panels
20kW Solar System: 200 100-Watt PV Panels 100 200-Watt PV Panels 68 300-Watt PV Panels 50 400-Watt PV Panels

Let’s break this chart down like this:

  • For a 1kW solar system, you would need either 30 100-watt solar panels, 5 200-watt solar panels, 4 300-watt solar panels, or 3 400-watt solar panels.
  • For a 3kW solar system, you would need either 50 100-watt solar panels, 15 200-watt solar panels, 10 300-watt solar panels, or 8 400-watt solar panels.
  • For a 5kW solar system, you would need either 50 100-watt solar panels, 25 200-watt solar panels, 17 300-watt solar panels, or 13 400-watt solar panels.
  • For a 10kW solar system, you would need either 100 100-watt solar panels, 50 200-watt solar panels, 34 300-watt solar panels, or 25 400-watt solar panels.
  • For a 20kW solar system, you would need either 200 100-watt solar panels, 100 200-watt solar panels, 68 300-watt solar panels, or 50 400-watt solar panels.

This is just how easy it is. We hope that this illustrates well how many solar panels you need for these differently-sized solar systems. If you need any help with the math, you can use the comments below, give us some numbers, and we will help you out.

2 thoughts on “How Many Panels In 1kW, 3kW, 5kW, 10kW, 20kW Solar System? (Easy)”

  1. THANK YOU FOR THE BEAUTIFUL PRESENTATION ON SOLAR POWER SYSTEM , A GREAT IDEA I LEARNED FROM YOUR PRESENTATION… GOD BLESS YOU ALWAYS

    Reply

Leave a Comment