How Much Power Does A 5kW Solar System Produce Per Day, Month, Year?

5kW is one of the most popular solar systems around. The key question here is how much power does a 5kW solar system produce per day, per month, and per year as in ‘5kw solar panel how many units per day?’.

We will teach you how you can adequately estimate how many kWh per day does a 5 kW system produce. Depending on how much sunlight you get (solar irradiance), a 5kW solar system can generate anywhere from 15.00 kWh to 22.50 kWh per day. That’s 5,400 kWh to 8,100 kWh per year.

In short, 5kW can produce more than $1,000 worth of electricity every year.

According to the US Energy Information Administration, the average annual electricity consumption for a U.S. household is 893 kWh per month (about $117,78/month). That’s about 30 kWh per day. Can a 5kW solar system produce 30 kWh per day? 5kW is a big system requiring about 17 300W solar panels and about 13 kWh batteries, after all.

Here’s how we will find that out:

We can adequately estimate how much power does a 5kW solar system produce per day using this basic solar output equation;

5kW Solar Output (kWh/Day) = Power Rating × Peak Sun Hours × 0.75

The key variable here is the Peak Sun Hours. Sunnier parts (south US, south of Europe) will, on average, get more peak sun hours (up to 6 hours/day) than northern parts (north US, north of Europe) with about 4 hours/day. The realistic output of 5kW will primarily depend on the sun exposure.

Example: In California with 5.5 peak sun hours per day, the 5kW solar system will produce 20.63 kWh per day or 7,528 kWh per year. In the UK or New York with 4 peak sun hours per day, the same 5kW solar system will produce 15 kWh per day or 5,475 kWh per year. That’s more than a 2,000 kWh difference with the same 5kW system (or a $270,79/year difference in electricity costs).

To help everybody out, we have designed a 5kW solar system output calculator (you’ll find it further on). It will give you an estimate of how many units does a 5kW solar system produce per day in your area. Here is how the calculator looks like:

How Much Power Does A 5kW Solar System Produce Per Day

Furthermore, we have calculated how much energy do 5kW solar systems produce (per day, month, year) in 4 – 6 peak sun hour areas and summarized them in the table below.

Before you use the calculator, let’s look at what is a realistic power output of a 5kW system in areas with 5 peak sun hours per day.

Average Power Output Of A 5kW Solar System Per Day, Month, Year (5 Peak Sun Hours)

To calculate the 5kW solar system power output, we use this equation:

5kW Solar Output (kWh/Day) = Power Rating × Peak Sun Hours × 0.75

We already know the Power Rating; it’s 5kW. At the end of the equation, you can see the 0.75 factor; that accounts for 25% losses an average 5kW system will suffer (due to inverter losses, DC, AC cable losses, temperature losses).

The key part – as we all know – is how much sun you get. That is measured in peak sun hours. On average, a 5kW solar system placed on the roof will get about 5 peak sun hours worth of sunlight.

When we understand and have all these 3 factors, we can calculate how much power does a 5kW solar system produce per day like this:

5kW Solar Output (kWh/Day) = 5kW × 5h × 0.75 = 18.75 kWh/Day

5 kW solar system in such an area can realistically produce 18.75 kWh a day. That’s 562.5 kWh per month and 6,843.75 kWh per month.

If we presume that the average price of electricity (in the US) is $0.1319/kWh, we can also calculate can a 5kW solar system save you per:

  • Day. 18.75 kWh per day translates into $2.47 per day.
  • Month. 562.5 kWh per month translates into $74.19 per month.
  • Year. 6,843.75 kWh per month translates into $902.69 per year.

Now, not everybody lives in the area with 5 peak sun hours per day. Here is the solar irradiance map of the US that illustrates that:

us peak sun hours average state by state
States in the US get anywhere between 4 and 5.75 peak sun hours worth of sunlight. Source: National Renewable Energy Laboratory (NREL), US Department of Energy.

To adequately estimate how many kWh a 5kW solar system on your roof will make, you can use this calculator:

5kW Solar System Output Calculator

Check how many peak sun hours per day do you get. Insert that number in the calculator and you’ll get an estimate of how many units will your 5kW solar system produce per day:

0.00 kWh/Day

5kW Solar System Daily Output

 

As you can see, the daily kWh output of the 5kW solar system is dynamically calculated.

We have calculated kWh output for areas with different solar irradiance (number of peak sun hours) and summarized them in this table:

Table Of 5kW Solar System Outputs Based on Solar Irradiance

No. Of Peak Sun Hours 5kW Output Per Day 5kW Output Per Month 5kW Output Per Year
4 hours 15.00 kWh/Day 450 kWh/Month 5,400 kWh/Year
4.1 hours 15.37 kWh/Day 461.1 kWh/Month 5,533.2 kWh/Year
4.2 hours 15.75 kWh/Day 472.5 kWh/Month 5,670 kWh/Year
4.3 hours 16.13 kWh/Day 483.9 kWh/Month 5,806.8 kWh/Year
4.4 hours 16.50 kWh/Day 495 kWh/Month 5,940 kWh/Year
4.5 hours 16.88 kWh/Day 506.4 kWh/Month 6,076.8 kWh/Year
4.6 hours 17.25 kWh/Day 517.5 kWh/Month 6,210 kWh/Year
4.7 hours 17.63 kWh/Day 528.9 kWh/Month 6,346.8 kWh/Year
4.8 hours 18.00 kWh/Day 540 kWh/Month 6,480 kWh/Year
4.9 hours 18.38 kWh/Day 551.4 kWh/Month 6,616.8 kWh/Year
5 hours 18.75 kWh/Day 562.5 kWh/Month 6,750 kWh/Year
5.1 hours 19.13 kWh/Day 573.9 kWh/Month 6,886.8 kWh/Year
5.2 hours 19.50 kWh/Day 585 kWh/Month 7,020 kWh/Year
5.3 hours 19.88 kWh/Day 596.4 kWh/Month 7,156.8 kWh/Year
5.4 hours 20.25 kWh/Day 607.5 kWh/Month 7,290 kWh/Year
5.5 hours 20.63 kWh/Day 618.9 kWh/Month 7,426.8kWh/Year
5.6 hours 21.00 kWh/Day 630 kWh/Month 7,560 kWh/Year
5.7 hours 21.38 kWh/Day 641.4 kWh/Month 7,696.8 kWh/Year
5.8 hours 21.75 kWh/Day 652.5 kWh/Month 7830 kWh/Year
5.9 hours 22.13 kWh/Day 663.9 kWh/Month 7,966.8 kWh/Year
6 hours 22.50 kWh/Day 675 kWh/Month 8,100 kWh/Year

Hopefully you can now adequately estimate how many kWh per day is 5kW system capable of generating.

Quick note: How much power does a 5.5 kW solar system produce? It just produces 10% more kWh than a 5 kW system. You can use the chart above, add 10% to these kWh outputs, and get the correct results. Example: At 5 peak sun hours, a 5.5 kW solar system produces 20.63 kWh/day, 618.75 kWh/month, and 7,425 kWh/year.

If you have some questions, you can pose them in the comment section below, and we’ll try to help you out with calculations.

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