How Many Solar Panels Do I Need For 2500 kWh Per Month? (Calculator)

How many solar panels does it take to produce 2500 kWh per month? A lot, actually. That’s quite a lot of electricity. No problem, we can calculate everything. We will show you exactly how you can determine how many solar panels you need for 2500 kWh per month. To help you out, we have created two very easy-to-use resources, namely:

  1. 2500 kWh Per Month Solar Calculator. This calculator estimates the size of the solar system and the number of solar panels (100W, 300W, or 400W) you need to generate 2500 kWh per month.
  2. Calculated Chart For 2500 kW (Number Of Panels). We have calculated how many solar panels you need for 2500 kWh per month, based on how sunny your location is (peak sun hours from 3.0 to 8.0), and summarized all the results in the chart.

Here are some ranges from the calculated chart:

  • To produce 2500 kWh per month, you will need a solar system sized between 13.89 kW and 37.04 kW.
  • If you only use 100-watt solar panels, you will need anywhere from 139 to 371 100-watt PV panels for 2500 kWh/month of electricity generation.
  • If you only use 300-watt solar panels, you will need anywhere from 47 to 124 300-watt PV panels for 2500 kWh/month of electricity generation.
  • If you only use 400-watt solar panels, you will need anywhere from 35 to 93 400-watt PV panels for 2500 kWh/month of electricity generation.
2500 kWh Per Month how many solar panels
In this picture, you will find 25 400-watt solar panels. To produce 2500 kWh per month, you will usually need double that number (you can put the same number and wattage of solar panels on the other side of the roof, for example).

As stated, 2500 kWh per month is quite a lot. If you multiply that by the $0.15/kWh electricity rate, it comes to $375 worth of electricity per month. So, almost $5000 per year.

As you well know, the number of solar panels you need for a 2500 kWh per month depends on the following two factors:

  • Wattage of the individual solar panels (100-watt, 300-watt, and 400-watt PV panels are the most commonly used). Obviously, you can also mix different wattage solar panels.
  • The amount of sun you get at your location. This is expressed in peak sun hours; cloudy places like Alaska will get about 3 peak sun hours per day, while sunnier places like California, Nevada, and Arizona can get 5, 6, or even 7 peak sun hours per day (yearly averages).

Alright, to make this calculation accurately, we have to:

  • First, determine the size of a solar system that will be able to produce 2500 kWh per month at your location (depends on how much sun you get, ie. peak sun hours).
  • Second, with the known size of the solar system (10kW, 15kW, 20kW, and so on), construct this system from either 100W, 300W, or 400W solar panels. These are the most common building blocks for solar-generated electricity.

We also need to include 25% solar system losses (inverter losses, AC wires, DC wires, shades, a fly on the panels, and so on).

Here is the full formula for calculating the solar system size for 2500 kWh per month:

2500 kWh Per Month Solar System Size = 2500 kWh / (30 Days × Peak Sun Hours × 0.75)

Here is how this formula works: Let’s take California as an example. We need to determine how much sun California gets (you can find the state-by-state 12-month averages here, or you can consult the NREL maps here or Global Solar Atlas here). From the state-by-state averages, we see that California get, on average, 5.38 peak sun hours per day. Let’s put this into the equation:

2500 kWh Monthly Solar System Size (California) = 2500 kWh / (30 Days × 5.38 × 0.75) = 20.65 kW Solar System

As we can see, if we want to generate 2500 kWh in California (12-month averages), we need to install a system that is a bit bigger than 20kW (20.65kW, to be exact). Here is how many 100W, 300W, or 400W we need for that:

  • If we use only 100-watt PV panels, we would need 207 100-watt solar panels (since 207 × 100 Watts = 20,700 Watts = 20.70kW, a bit more than we need).
  • If we use only 300-watt PV panels, we would need 69 300-watt solar panels (since 69 × 300 Watts = 20,700 Watts = 20.70kW)
  • If we use only 400-watt PV panels, we would need 52 400-watt solar panels (since 52 × 400 Watts = 20,800 Watts = 20.80kW).

Now, as we can see, this involves quite a lot of math. To make things simpler, we have created a 2500 kWh Per Month Solar Calculator; you just input peak sun hours at your location, and the calculator will tell you what size system and how many 100W, 300W, or 400W you need to generate 2500 kWh per month.

We have also calculated the number of solar panels needed for 2500 kWh/month for all locations – from the cloudiest 3.0 peak sun hours location to the sunniest 8.0 peak sun hours locations – and summarized the results in the chart you can find below this calculator:

2500 kWh Per Month Solar Calculator

 

Alright, here is how this calculator works:

Let’s say that, at your location, you get 4.67 peak sun hours on average. How many solar panels will you need to generate 2500 kWh per month? Simple. Just slide the slider to ‘4.67’ and you get the result:

At a location receiving 4.67 peak sun hours per day, you will need a 23.79 kW solar system for 2500 kWh/month. In terms of the number of solar panels needed, you would need either 238 100-watt PV panels, 80 300-watt PV panels, or 60 400-watt PV panels.

If you are using Tesla roof solar panels, for example, these are 400W panels, and you would need 60 of them on your roof or/and in your yard.

Not everybody lives at a location that received 4.67 peak sun hours. That’s why we calculated the 2500 kWh solar panel size and the number of solar panels needed for all locations; from 3.0 to 8.0 peak sun hours, and summarized the results in this chart:

Number Of Solar Panels Needed For 2500 kWh/Month For Different Sun Exposures

Peak Sun Hours: 2500 kWh Solar System Size: Number Of 100-Watt Solar Panels For 2500 kWh/Month: Number Of 300-Watt Solar Panels For 2500 kWh/Month: Number Of 400-Watt Solar Panels For 2500 kWh/Month:
3.0 Peak Sun Hours: 37.04 kW Solar System 371 Of 100-Watt Solar Panels 124 Of 300-Watt Solar Panels 93 Of 400-Watt Solar Panels
3.1 Peak Sun Hours: 35.84 kW Solar System 359 Of 100-Watt Solar Panels 120 Of 300-Watt Solar Panels 90 Of 400-Watt Solar Panels
3.2 Peak Sun Hours: 34.72 kW Solar System 348 Of 100-Watt Solar Panels 116 Of 300-Watt Solar Panels 87 Of 400-Watt Solar Panels
3.3 Peak Sun Hours: 33.67 kW Solar System 337 Of 100-Watt Solar Panels 113 Of 300-Watt Solar Panels 85 Of 400-Watt Solar Panels
3.4 Peak Sun Hours: 32.68 kW Solar System 327 Of 100-Watt Solar Panels 109 Of 300-Watt Solar Panels 82 Of 400-Watt Solar Panels
3.5 Peak Sun Hours: 31.75 kW Solar System 318 Of 100-Watt Solar Panels 106 Of 300-Watt Solar Panels 80 Of 400-Watt Solar Panels
3.6 Peak Sun Hours: 30.86 kW Solar System 309 Of 100-Watt Solar Panels 103 Of 300-Watt Solar Panels 78 Of 400-Watt Solar Panels
3.7 Peak Sun Hours: 30.03 kW Solar System 301 Of 100-Watt Solar Panels 101 Of 300-Watt Solar Panels 76 Of 400-Watt Solar Panels
3.8 Peak Sun Hours: 29.24 kW Solar System 293 Of 100-Watt Solar Panels 98 Of 300-Watt Solar Panels 74 Of 400-Watt Solar Panels
3.9 Peak Sun Hours: 28.49 kW Solar System 285 Of 100-Watt Solar Panels 95 Of 300-Watt Solar Panels 72 Of 400-Watt Solar Panels
4.0 Peak Sun Hours: 27.78 kW Solar System 278 Of 100-Watt Solar Panels 93 Of 300-Watt Solar Panels 70 Of 400-Watt Solar Panels
4.1 Peak Sun Hours: 27.10 kW Solar System 272 Of 100-Watt Solar Panels 91 Of 300-Watt Solar Panels 68 Of 400-Watt Solar Panels
4.2 Peak Sun Hours: 26.46 kW Solar System 265 Of 100-Watt Solar Panels 89 Of 300-Watt Solar Panels 67 Of 400-Watt Solar Panels
4.3 Peak Sun Hours: 25.84 kW Solar System 259 Of 100-Watt Solar Panels 87 Of 300-Watt Solar Panels 65 Of 400-Watt Solar Panels
4.4 Peak Sun Hours: 25.25 kW Solar System 253 Of 100-Watt Solar Panels 85 Of 300-Watt Solar Panels 64 Of 400-Watt Solar Panels
4.5 Peak Sun Hours: 24.69 kW Solar System 247 Of 100-Watt Solar Panels 83 Of 300-Watt Solar Panels 62 Of 400-Watt Solar Panels
4.6 Peak Sun Hours: 24.15 kW Solar System 242 Of 100-Watt Solar Panels 81 Of 300-Watt Solar Panels 61 Of 400-Watt Solar Panels
4.7 Peak Sun Hours: 23.64 kW Solar System 237 Of 100-Watt Solar Panels 79 Of 300-Watt Solar Panels 60 Of 400-Watt Solar Panels
4.8 Peak Sun Hours: 23.15 kW Solar System 232 Of 100-Watt Solar Panels 78 Of 300-Watt Solar Panels 58 Of 400-Watt Solar Panels
4.9 Peak Sun Hours: 22.68 kW Solar System 227 Of 100-Watt Solar Panels 76 Of 300-Watt Solar Panels 57 Of 400-Watt Solar Panels
5.0 Peak Sun Hours: 22.22 kW Solar System 223 Of 100-Watt Solar Panels 75 Of 300-Watt Solar Panels 56 Of 400-Watt Solar Panels
5.1 Peak Sun Hours: 21.79 kW Solar System 218 Of 100-Watt Solar Panels 73 Of 300-Watt Solar Panels 55 Of 400-Watt Solar Panels
5.2 Peak Sun Hours: 21.37 kW Solar System 214 Of 100-Watt Solar Panels 72 Of 300-Watt Solar Panels 54 Of 400-Watt Solar Panels
5.3 Peak Sun Hours: 20.96 kW Solar System 210 Of 100-Watt Solar Panels 70 Of 300-Watt Solar Panels 53 Of 400-Watt Solar Panels
5.4 Peak Sun Hours: 20.58 kW Solar System 206 Of 100-Watt Solar Panels 69 Of 300-Watt Solar Panels 52 Of 400-Watt Solar Panels
5.5 Peak Sun Hours: 20.20 kW Solar System 203 Of 100-Watt Solar Panels 68 Of 300-Watt Solar Panels 51 Of 400-Watt Solar Panels
5.6 Peak Sun Hours: 19.84 kW Solar System 199 Of 100-Watt Solar Panels 67 Of 300-Watt Solar Panels 50 Of 400-Watt Solar Panels
5.7 Peak Sun Hours: 19.49 kW Solar System 195 Of 100-Watt Solar Panels 65 Of 300-Watt Solar Panels 49 Of 400-Watt Solar Panels
5.8 Peak Sun Hours: 19.16 kW Solar System 192 Of 100-Watt Solar Panels 64 Of 300-Watt Solar Panels 48 Of 400-Watt Solar Panels
5.9 Peak Sun Hours: 18.83 kW Solar System 189 Of 100-Watt Solar Panels 63 Of 300-Watt Solar Panels 48 Of 400-Watt Solar Panels
6.0 Peak Sun Hours: 18.52 kW Solar System 186 Of 100-Watt Solar Panels 62 Of 300-Watt Solar Panels 47 Of 400-Watt Solar Panels
6.1 Peak Sun Hours: 18.21 kW Solar System 183 Of 100-Watt Solar Panels 61 Of 300-Watt Solar Panels 46 Of 400-Watt Solar Panels
6.2 Peak Sun Hours: 17.92 kW Solar System 180 Of 100-Watt Solar Panels 60 Of 300-Watt Solar Panels 45 Of 400-Watt Solar Panels
6.3 Peak Sun Hours: 17.64 kW Solar System 177 Of 100-Watt Solar Panels 59 Of 300-Watt Solar Panels 45 Of 400-Watt Solar Panels
6.4 Peak Sun Hours: 17.36 kW Solar System 174 Of 100-Watt Solar Panels 58 Of 300-Watt Solar Panels 44 Of 400-Watt Solar Panels
6.5 Peak Sun Hours: 17.09 kW Solar System 171 Of 100-Watt Solar Panels 57 Of 300-Watt Solar Panels 43 Of 400-Watt Solar Panels
6.6 Peak Sun Hours: 16.84 kW Solar System 169 Of 100-Watt Solar Panels 57 Of 300-Watt Solar Panels 43 Of 400-Watt Solar Panels
6.7 Peak Sun Hours: 16.58 kW Solar System 166 Of 100-Watt Solar Panels 56 Of 300-Watt Solar Panels 42 Of 400-Watt Solar Panels
6.8 Peak Sun Hours: 16.34 kW Solar System 164 Of 100-Watt Solar Panels 55 Of 300-Watt Solar Panels 41 Of 400-Watt Solar Panels
6.9 Peak Sun Hours: 16.10 kW Solar System 162 Of 100-Watt Solar Panels 54 Of 300-Watt Solar Panels 41 Of 400-Watt Solar Panels
7.0 Peak Sun Hours: 15.87 kW Solar System 159 Of 100-Watt Solar Panels 53 Of 300-Watt Solar Panels 40 Of 400-Watt Solar Panels
7.1 Peak Sun Hours: 15.65 kW Solar System 157 Of 100-Watt Solar Panels 53 Of 300-Watt Solar Panels 40 Of 400-Watt Solar Panels
7.2 Peak Sun Hours: 15.43 kW Solar System 155 Of 100-Watt Solar Panels 52 Of 300-Watt Solar Panels 39 Of 400-Watt Solar Panels
7.3 Peak Sun Hours 15.22 kW Solar System 153 Of 100-Watt Solar Panels 51 Of 300-Watt Solar Panels 39 Of 400-Watt Solar Panels
7.4 Peak Sun Hours 15.02 kW Solar System 151 Of 100-Watt Solar Panels 51 Of 300-Watt Solar Panels 38 Of 400-Watt Solar Panels
7.5 Peak Sun Hours 14.81 kW Solar System 149 Of 100-Watt Solar Panels 50 Of 300-Watt Solar Panels 38 Of 400-Watt Solar Panels
7.6 Peak Sun Hours 14.62 kW Solar System 147 Of 100-Watt Solar Panels 49 Of 300-Watt Solar Panels 37 Of 400-Watt Solar Panels
7.7 Peak Sun Hours 14.43 kW Solar System 145 Of 100-Watt Solar Panels 49 Of 300-Watt Solar Panels 37 Of 400-Watt Solar Panels
7.8 Peak Sun Hours 14.25 kW Solar System 143 Of 100-Watt Solar Panels 48 Of 300-Watt Solar Panels 36 Of 400-Watt Solar Panels
7.9 Peak Sun Hours 14.06 kW Solar System 141 Of 100-Watt Solar Panels 47 Of 300-Watt Solar Panels 36 Of 400-Watt Solar Panels
8.0 Peak Sun Hours 13.89 kW Solar System 139 Of 100-Watt Solar Panels 47 Of 300-Watt Solar Panels 35 Of 400-Watt Solar Panels

Alright, now we have all the numbers. Using this chart, you can quite easily tell how many solar panels you need to produce 2500 kWh of electricity per month.

For example, let’s say that you live in an area with 4.50 peak sun hours. What size system and how many solar panels do you need for 2500 kWh/month? Just check the table to get the result: You need an almost 25kW system (24.68kW, to be exact) for 2500 kWh/month. To construct it, will can use 247 100-watt solar panels, or 83 300-watt solar panels, or 62 400-watt solar panels.

With the use of this chart and the calculator above, you can now easily calculate how many solar panels you need for 2500 kWh per month of electricity. If you need any help, you can use the comments below, give us some figures, and we will see how we can help you out.

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