# What Size Solar Panels Do I Need?

Are you wondering what size solar panels you need for your home? Use this calculator to find out how many solar panels you need to power your home.

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## Solar Panel Sizes

Solar panels come in a variety of sizes, but what size solar panel do you need? The size of the solar panel will determine how much power it can produce. If you have a large home, you will need a large solar panel. If you have a small home, you will need a small solar panel. The size of the solar panel will also determine the price.

### The average home has a 30-panel system

The average home has a 30-panel system, which typically produces around 11,000 kilowatt hours (kWh) of power per year.

Solar panel size is measured in Watts (W). Most home solar panels on the market today range from 250 to 400 watts, but some panels boast up to 435 watts.

The average solar panel size for a typical US residential solar installation is approximately 65 inches by 39 inches, or 5.4 feet by 3.3 feet.

Multiplying the length and width of a standard 65×39-inch solar panel results in an area of 2,515 square inches. This is just over 20 square feet. Therefore, a typical residential solar installation in the US averages out to be just under 30 square feet per panel, or around 900 square feet for an average 30-panel system.

While the physical size of your solar panel array will have an impact on how much roof space it will require, it’s important to remember that the number of panels you need is entirely dependent on the amount of power you want to generate.

For example, a 1-kilowatt (kW) system will require about 100 square feet of roof space and 10-15 panels depending on the wattage of the particular panels used.

## Solar Panel Output

How much power do solar panels produce? This is a common question among those considering solar for their home. Solar panel output is determined by a number of factors including the type and size of the panel, sunlight availability, the angle of the panels, panel efficiency, and more.

### A typical solar panel produces about 250 watts of power

Solar panels come in a variety of sizes, but a typical panel produces about 250 watts of power. In general, you’ll need about one panel per 100 square feet of roof space. So, if you have a 2,000-square-foot roof, you’ll need about 20 panels.

## Solar Panel Efficiency

You’ve heard that solar panels can save you money on your electric bill, but what you may not know is that the efficiency of your solar panels plays a big role in how much money you’ll actually save. Solar panel efficiency is measured by the percentage of sunlight that is converted into electricity, and panel efficiency can range from as low as 10% to as high as 22%.

### Solar panels have an average efficiency of about 15-20%

Solar panels have an average efficiency of about 15-20%. This means that if you have a 1kW system, you can expect it to generate between 150 and 200 kWh of electricity per year – enough to cover the average home’s electricity needs.

The size of your solar panel system will affect how much electricity it can generate. For example, a 1kW system will generate more electricity than a 3kW system, but it will also take up more roof space.

You can calculate the size of solar panel system you need by first determine how much electricity you use on average per month. This information is typically found on your utility bill. Once you know your monthly usage, you can divide it by 30 (the number of days in a month) to get your daily usage.

Now that you know your daily usage, you can multiply it by the number of hours of sunlight that your location receives on average. This will give you an estimate of how many kilowatt-hours (kWh) your solar panel system will need to generate each day.

Finally, divide this number by the efficiency of your solar panels to determine how many panels you will need. For example, if you live in an area that receives 4 hours of sunlight per day and you use 30 kWh of electricity per day, you would need a 7.5 kW system (30 kWh / 4 hours = 7.5 kW). If your solar panels have an efficiency of 20%, you would need 37.5 panels (7.5 kW / 0.2 = 37.5).

## Solar Panel Warranties

20-year warranties are the industry standard for solar panels. That means if your panels break, the manufacturer will replace them for free. But what else should you look for in a solar panel warranty? Let’s take a closer look.

### Solar panels typically come with a 20-25 year warranty

Most solar panels on the market today come with a 20-25 year warranty. This means that the manufacturer guarantees that the panel will produce at least 80% of its rated power after 20 years, and at least 90% after 25 years. Some manufacturers offer even longer warranties, up to 30 or even 35 years.