Updated: Aug 23
The number of solar panels needed to generate 100 kWh per day [or 3,000 kWh per month] is determined by your state’s weather conditions, the rating of the solar panels and the condition of your rooftop. Moreover, the size of the solar system that can be installed on your rooftop is subject to the area and orientation of your rooftop.
Furthermore, the amount of power generated by solar panels varies with the weather throughout the year, also the amount of power required to run the house varies too so you need to be clear whether you need solar panels to generate 100kWh of power per day for any particular month or on average.
Take a solar survey to find true potential of your rooftop.
However, there are some other factors that will affect the power generation of solar panels, such as rooftop facing, shadow-free areas, and peak sun hours in your city. As a result, to calculate the number of solar panels necessary to generate 100 kWh per day or 3,000 per kWh per month you need to know a few things.
First, we are assuming you need a solar system to produce 100 kWh on average in a year. Otherwise, it will be a little bit complicated to calculate the number of solar panels.
Second, it is recommended to go with a higher-rated solar panel like a 400-watt, because a 400-watt solar panel is only 28% bigger than a 250-watt solar panel. However, it generates 60% higher power than a 250-watt solar panel. Going with a higher-rated solar panel is both space-saving and economical.
Third, we are assuming that you have a south-facing rooftop because in the USA a south-facing solar panel generates the highest amount of power. This is because the USA is located in the Northern Hemisphere of the earth and in Northern Hemisphere; the SUN is always along the southern part of the sky.
However, if you do not have south facing rooftop that does not means that you can't install solar panels that means you might need a slightly larger size of the solar system.
Fourth, we are also assuming that you have a shadow-free rooftop, because solar panels (or cells of a solar panel) that received lower sunlight than the rest, acted as loads and caused drops in current, power, and efficiency.
However, if your rooftop (or part of the rooftop) has some shadow for a short period, then you do not need to worry, you can still install solar panels there.
Fourth, Solar panels generated more power in states with more peak sun hours than in states with lower peak sun hours.
Peak sun hours differ from daylight hours. Peak sun hours are defined as the time of day when the intensity of sunshine is greatest. In other words, most electricity is generated by solar panels during peak sun hours.
To find the true potential of your rooftop, we recommend you go for a solar survey first.
Calculating the number of solar panels required to generate 100kWh per day/3,000 kWh per month in the USA.
For our calculation, we will use a 400-watt of solar panel and assume that you have a shadow-free, south-facing rooftop (for ease of our calculation). In addition, we need to consider two cases of states in the USA with 5-6 peak sun hours and states with 3.5-4 peak sun hours.
From the below map, you can see how much power a 1kW of solar system can generate per day in different states of the USA.
In the USA, a state with 4.5-5 peak sun hours, 1 kW of solar system can 4.5kWh of power per day, hence to generate 100 kWh per day (or 3,000 kWh per month) you need (100/4.5=) 22 kW of solar system having (22000/400 = ) 55 numbers of 400 Watt solar panels.
Similarly, in the USA a state with 3.5-4 peak sun hours, 1 kW of solar system can 2.8 kWh of power per day, hence we need more numbers of solar panels to generate 100 kWh per day (or 3,000 kWh per month). For a state with 3.5-4 peak sun hours you need (100/2.8=) 36 kW of solar system having (36000/400 =) 90 numbers of 400 Watt solar panels.
Learn from us, how much power solar generate in your state.
Similarly, you can calculate how many solar panels are needed to generate 2,000 kWh per month or you can do a reverse calculation to find out how much power any number of solar panels can generate in your state.
In the USA | How many solar panels for 100kWH per day (or 3,000 per month)?
In the United States, to generate 100 kWh per day (3,000 kWh per month) from solar panels installed on a south-facing rooftop you will require 55 numbers of 400-watt solar panels for the state with 5-6 peak sun hours. In contrast, the same rooftop will require 90 numbers of 400-watt solar panels to generate the same amount of power.
If you are living in states like Michigan and Wisconsin where the per day peak sun hours is 3.5-4 hours then you will require 63% more numbers of solar panels to generate 100kWh per day (or 3,000 kWh per month) as compared to states like Texas and California where the average peak sun hours is national highest.
Furthermore, 400-watt solar panels are 22.75 square feet and installing 55 numbers of them will cover 1251.25 square feet of rooftop space. Moreover, installing 90 numbers of them will cover 2,252.25 square feet. However, if you do not have that much space then going with a small-size solar system will also help to cut down your electricity bills.
In addition to solar panels, you will also require a solar inverter, AC/DC cables, AC/DC junction boxes, DC isolators and many other installed equipment. Also, you might need to relocate any pipe mounted on your rooftop to make space for solar panels. Installing 55 to 90 numbers of solar panels on the rooftop required lots of effort and paperwork. Hence, you will require a professional team for your solar power plant.
With its highly respected customer service, ADT Solar provides exactly that. With ADT backing, the firm is a good alternative for anybody who values customer service and high-quality solar panels.
How much do solar panels cost for 100kWH per day (or 3,000 per month) in the USA?
After factoring in the federal solar tax credit, the cost of installing 55 numbers of 400-watt solar panels for 100kWh per day or 3,000kWh per month in the United States ranges from $4,6200 to $6,4900.
However, other factors can affect the cost of installing a solar system on your property. Like Rooftop construction: Many solar installation companies charge according to the difficulty of the installation, and having a complex rooftop construction may raise the cost of solar installation.
Type of solar panels: Solar panels are classified into two types: monocrystalline and polycrystalline. Monocrystalline solar panels are more expensive than polycrystalline panels. Monocrystalline, on the other hand, is more efficient and smaller.
Monocrystalline panels are preferable for rooftops with smaller shadow-free areas.
However, having a solar installer that provides transparency, a courteous customer care team, and a well-established installation procedure makes converting to solar more accessible and approachable.
And we will help you to find the perfect solar installer, Just fill out the form and we will connect you with the best solar installer in your region. << Click here.