How Many Solar Panels Do I Need For 500 kWh Per Month? (Calculator)

500 kWh per month can easily be done even by a smaller solar system. How many solar panels you need for 500 kWh per month depends primarily on how much sun you get. We will show you exactly to calculate the number of solar panels needed to produce 500 kWh per month at your location.

To help you out, we have prepared these two useful resources:

  1. 500 kWh Per Month Solar Calculator. Based on the peak sun hours at your location input, this calculator will tell you what size solar system you need, and how many solar panels you need to produce 500 kWh per month (yearly average).
  2. Number Of Solar Panels For 500 kWh Per Month Chart. We have calculated the size and number of 100-watt, 300-watt, and 400-watt solar panels needed for 500 kWh per month. This ranges from very cold and cloudy locations to very hot and very sunny locations; ie. peak sun hours from 3.0 to 8.0 per day.

Here are the quick ranges from the results found in the chart:

  • For 500 kWh per month, you will need anywhere from about 3kW to 7.5kW solar system. In most locations in the US, the 5kW solar system will suffice.
  • If you are using only 100-watt solar panels, you will need anywhere from 28 to 75 100-watt solar panels.
  • If you are using only 300-watt solar panels, you will need anywhere from 10 to 25 300-watt solar panels.
  • If you are using only 400-watt solar panels, you will need anywhere from 7 to 19 400-watt solar panels.
How Many Solar Panels Do I Need For 500 kWh Per Month
To calculate the 500 kWh per month, we have accounted for 25% losses that DC wires, AC wires, inverter, and so on, cause.

Alright, the only thing you need to figure out is how much sun do you get. In solar terms, this is called peak sun hours per day. For example, sunny California gets 5.38 peak sun hours per day, while colder Illinois gets 3.14 peak sun hours per day (yearly averages). You can check how much sun you get (how many peak sun hours at your location) by consulting:

Namely, with 500 kWh per month, you are basically shooting for 16.67 kWh per day (500 kWh / 30 days = 16.67 kWh/day). First, we will determine the size of the solar system we need for 500 kWh per month, then we will look at how many solar panels (either 100W, 300W, or 400W) we need to construct this system.

Note: We are using 25% solar system losses due to inverters, AC, DC wires, batteries, and so on.

To illustrate how sun exposure at your location influences electricity generation, here are a few examples:

  • At 3 sun peak hours, a 5kW solar system will produce 15 kWh per day or 450 kWh per month. Applying 25% losses, that’s effectively 337.5 kWh per month.
  • At 4 sun peak hours, a 5kW solar system will produce 20 kWh per day or 600 kWh per month.
  • Applying 25% losses, that’s effectively 450 kWh per month.
  • At 5 sun peak hours, a 5kW solar system will produce 25 kWh per day or 750 kWh per month.
  • Applying 25% losses, that’s effectively 562.5 kWh per month.
  • At 6 sun peak hours, a 5kW solar system will produce 30 kWh per day or 900 kWh per month.
  • Applying 25% losses, that’s effectively 675kWh per month.

Now, if we want to get precisely 500 kWh per month, we can write the equation for calculating the size of a solar system needed like this:

500 kWh Per Month Solar System Size = 500 kWh Per Month / (30 Days × Peak Sun Hours × 0.75)

Let’s take California as an example. According to the irradiance chart by state, California gets 5.38 peak sun hours per day (12-month average). What size solar system do we need for 500 kWh per month? Let’s use the formula above like this:

500 kWh Per Month Solar System Size (California) = 500 kWh Per Month / (30 Days × 5.38 Peak Sun Hours × 0.75 ) = 4.131 kW System

As we can see, to produce 500 kWh per month in California, you will need a solar system a bit larger than 4kW (4.131 kW, to be exact). Based on that, here are the number of solar panels you need for 500 kWh in California:

  • You can use 42 100-watt solar panels.
  • You can use 13 300-watt solar panels.
  • You can use 11 400-watt solar panels.

Of course, you could also mix solar panels with different wattages.

This was just a California example. To calculate the same thing for your location/state, check the peak sun hours you get at your location. Then you can use the following 500 kWh Per Month Solar Calculator; just input peak sun hours, and the calculator will determine the size of the system you need, and how many 100-watt, 300-watt, or 400-watt solar panels you need to produce 500 kWh per month.

Below the calculator, you can also consult the chart; we have calculated the 500 kWh solar system size and the number of 100W, 300W, 400W needed for 3.0 to 8.0 peak sun hours per day locations (all the results are summarized in the chart):

500 kWh Per Month Solar Calculator

 

Here’s how you can use this calculator:

Let’s say that you have figured out that you get 4.85 peak sun hours per day at your location. How many solar panels do you need for 500 kWh/month? Just slide the slider to ‘4.85’, and you get the results:

At 4.85 peak sun hours, you will need a 4.582 kW solar system. You can construct such a system with 46 100-watt solar panels, 16 300-watt solar panels, or 12 400-watt solar panels.

For example, if you were using 400-watt Tesla roof panels, you would need 12 of them to get 500 kWh per month,

At your location, you probably don’t get 4.85 peak sun hours; you get less than that or more than that. To help everybody out, we have taken locations that get from 3.0 to 8.0 peak sun hours, and calculated the size of the solar system and the number of 100W, 300W, 400W solar panels needed to produce 500 kWh per month, and summarized the results in this chart:

Number Of Solar Panels For 500 kWh Per Month Chart

Peak Sun Hours: 500 kWh Solar System Size: Number Of 100-Watt Solar Panels For 500 kWh/Month: Number Of 300-Watt Solar Panels For 500 kWh/Month: Number Of 400-Watt Solar Panels For 500 kWh/Month:
3.0 Peak Sun Hours: 7.407 kW Solar System 75 Of 100-Watt Solar Panels 25 Of 300-Watt Solar Panels 19 Of 400-Watt Solar Panels
3.1 Peak Sun Hours: 7.168 kW Solar System 72 Of 100-Watt Solar Panels 24 Of 300-Watt Solar Panels 18 Of 400-Watt Solar Panels
3.2 Peak Sun Hours: 6.944 kW Solar System 70 Of 100-Watt Solar Panels 24 Of 300-Watt Solar Panels 18 Of 400-Watt Solar Panels
3.3 Peak Sun Hours: 6.734 kW Solar System 68 Of 100-Watt Solar Panels 23 Of 300-Watt Solar Panels 17 Of 400-Watt Solar Panels
3.4 Peak Sun Hours: 6.536 kW Solar System 66 Of 100-Watt Solar Panels 22 Of 300-Watt Solar Panels 17 Of 400-Watt Solar Panels
3.5 Peak Sun Hours: 6.349 kW Solar System 64 Of 100-Watt Solar Panels 22 Of 300-Watt Solar Panels 16 Of 400-Watt Solar Panels
3.6 Peak Sun Hours: 6.173 kW Solar System 62 Of 100-Watt Solar Panels 21 Of 300-Watt Solar Panels 16 Of 400-Watt Solar Panels
3.7 Peak Sun Hours: 6.006 kW Solar System 61 Of 100-Watt Solar Panels 21 Of 300-Watt Solar Panels 16 Of 400-Watt Solar Panels
3.8 Peak Sun Hours: 5.848 kW Solar System 59 Of 100-Watt Solar Panels 20 Of 300-Watt Solar Panels 15 Of 400-Watt Solar Panels
3.9 Peak Sun Hours: 5.698 kW Solar System 57 Of 100-Watt Solar Panels 19 Of 300-Watt Solar Panels 15 Of 400-Watt Solar Panels
4.0 Peak Sun Hours: 5.556 kW Solar System 56 Of 100-Watt Solar Panels 19 Of 300-Watt Solar Panels 14 Of 400-Watt Solar Panels
4.1 Peak Sun Hours: 5.420 kW Solar System 55 Of 100-Watt Solar Panels 19 Of 300-Watt Solar Panels 14 Of 400-Watt Solar Panels
4.2 Peak Sun Hours: 5.291 kW Solar System 53 Of 100-Watt Solar Panels 18 Of 300-Watt Solar Panels 14 Of 400-Watt Solar Panels
4.3 Peak Sun Hours: 5.168 kW Solar System 52 Of 100-Watt Solar Panels 18 Of 300-Watt Solar Panels 13 Of 400-Watt Solar Panels
4.4 Peak Sun Hours: 5.051 kW Solar System 51 Of 100-Watt Solar Panels 17 Of 300-Watt Solar Panels 13 Of 400-Watt Solar Panels
4.5 Peak Sun Hours: 4.938 kW Solar System 50 Of 100-Watt Solar Panels 17 Of 300-Watt Solar Panels 13 Of 400-Watt Solar Panels
4.6 Peak Sun Hours: 4.831 kW Solar System 49 Of 100-Watt Solar Panels 17 Of 300-Watt Solar Panels 13 Of 400-Watt Solar Panels
4.7 Peak Sun Hours: 4.728 kW Solar System 48 Of 100-Watt Solar Panels 16 Of 300-Watt Solar Panels 12 Of 400-Watt Solar Panels
4.8 Peak Sun Hours: 4.630 kW Solar System 47 Of 100-Watt Solar Panels 16 Of 300-Watt Solar Panels 12 Of 400-Watt Solar Panels
4.9 Peak Sun Hours: 4.535 kW Solar System 46 Of 100-Watt Solar Panels 16 Of 300-Watt Solar Panels 12 Of 400-Watt Solar Panels
5.0 Peak Sun Hours: 4.444 kW Solar System 45 Of 100-Watt Solar Panels 15 Of 300-Watt Solar Panels 12 Of 400-Watt Solar Panels
5.1 Peak Sun Hours: 4.357 kW Solar System 44 Of 100-Watt Solar Panels 15 Of 300-Watt Solar Panels 11 Of 400-Watt Solar Panels
5.2 Peak Sun Hours: 4.274 kW Solar System 43 Of 100-Watt Solar Panels 15 Of 300-Watt Solar Panels 11 Of 400-Watt Solar Panels
5.3 Peak Sun Hours: 4.193 kW Solar System 42 Of 100-Watt Solar Panels 14 Of 300-Watt Solar Panels 11 Of 400-Watt Solar Panels
5.4 Peak Sun Hours: 4.115 kW Solar System 42 Of 100-Watt Solar Panels 14 Of 300-Watt Solar Panels 11 Of 400-Watt Solar Panels
5.5 Peak Sun Hours: 4.040 kW Solar System 41 Of 100-Watt Solar Panels 14 Of 300-Watt Solar Panels 11 Of 400-Watt Solar Panels
5.6 Peak Sun Hours: 3.968 kW Solar System 40 Of 100-Watt Solar Panels 14 Of 300-Watt Solar Panels 10 Of 400-Watt Solar Panels
5.7 Peak Sun Hours: 3.899 kW Solar System 39 Of 100-Watt Solar Panels 13 Of 300-Watt Solar Panels 10 Of 400-Watt Solar Panels
5.8 Peak Sun Hours: 3.831 kW Solar System 39 Of 100-Watt Solar Panels 13 Of 300-Watt Solar Panels 10 Of 400-Watt Solar Panels
5.9 Peak Sun Hours: 3.766 kW Solar System 38 Of 100-Watt Solar Panels 13 Of 300-Watt Solar Panels 10 Of 400-Watt Solar Panels
6.0 Peak Sun Hours: 3.704 kW Solar System 38 Of 100-Watt Solar Panels 13 Of 300-Watt Solar Panels 10 Of 400-Watt Solar Panels
6.1 Peak Sun Hours: 3.643 kW Solar System 37 Of 100-Watt Solar Panels 13 Of 300-Watt Solar Panels 10 Of 400-Watt Solar Panels
6.2 Peak Sun Hours: 3.584 kW Solar System 36 Of 100-Watt Solar Panels 12 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.3 Peak Sun Hours: 3.472 kW Solar System 35 Of 100-Watt Solar Panels 12 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.4 Peak Sun Hours: 3.527 kW Solar System 36 Of 100-Watt Solar Panels 12 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.5 Peak Sun Hours: 3.419 kW Solar System 35 Of 100-Watt Solar Panels 12 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.6 Peak Sun Hours: 3.367 kW Solar System 34 Of 100-Watt Solar Panels 12 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.7 Peak Sun Hours: 3.317 kW Solar System 34 Of 100-Watt Solar Panels 12 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.8 Peak Sun Hours: 3.268 kW Solar System 33 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
6.9 Peak Sun Hours: 3.221 kW Solar System 33 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 9 Of 400-Watt Solar Panels
7.0 Peak Sun Hours: 3.175 kW Solar System 32 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.1 Peak Sun Hours: 3.130 kW Solar System 32 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.2 Peak Sun Hours: 3.086 kW Solar System 31 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.3 Peak Sun Hours 3.044 kW Solar System 31 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.4 Peak Sun Hours 3.003 kW Solar System 31 Of 100-Watt Solar Panels 11 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.5 Peak Sun Hours 2.963 kW Solar System 30 Of 100-Watt Solar Panels 10 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.6 Peak Sun Hours 2.924 kW Solar System 30 Of 100-Watt Solar Panels 10 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.7 Peak Sun Hours 2.886 kW Solar System 29 Of 100-Watt Solar Panels 10 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.8 Peak Sun Hours 2.849 kW Solar System 29 Of 100-Watt Solar Panels 10 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
7.9 Peak Sun Hours 2.813 kW Solar System 29 Of 100-Watt Solar Panels 10 Of 300-Watt Solar Panels 8 Of 400-Watt Solar Panels
8.0 Peak Sun Hours 2.778 kW Solar System 28 Of 100-Watt Solar Panels 10 Of 300-Watt Solar Panels 7 Of 400-Watt Solar Panels

Alright, this was a lot of calculating. Now, you can just check this chart to figure out how many PV panels you need for 500 kWh per month.

Example: Let’s say you live in an area with 4.9 peak sun hours. To produce 500 kWh per month, you would need a 4.535 kW solar system (about 4.5kW). That means you would either need 46 100-watt PV panels, 16 300-watt PV panels, or 12 400-watt PV panels to construct this 500 kWh per month solar system.

Using the calculator and consulting this chart, you are now fully equipped to determine how many solar panels you need for 500 kWh per month output, as well as the size of the solar system you should be looking at.

If you need any help or have suggestions, you can use the comment section below, and we will try to help you out as best we can.

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