All About Daily Philadelphia News

How many solar panels are needed to run a house?

Jul 13

In recent years, solar panels have seen a rapid rise in popularity. This is due to a rise in environmental responsibility and the desire for lower energy bills. You might be wondering how many solar panels are needed to power a home if you are considering making the switch.

Although the answer may seem complicated, it is possible to hire a professional to handle the installation process. They will likely also give tips and tricks on how to clean and maintain solar panels.

If you are curious about how many solar panels your house may require and would like to calculate it yourself, here are some details: How much energy you use, how much roof space you have that can be used for solar panel placement, and how much sun your home receives.

How do I determine how many solar panels I need?

According to EnergySage, there are three factors that can be used to calculate how many solar panels will power a house: annual energy consumption, panel wattage, and production ratios. What does this mean?

Annual Electricity Use

First, determine your annual electricity consumption. This is the total electricity used by your household over a given year. This number is measured in kWh (kilowatt-hours). It includes all electricity sources in your home including lights, air conditioners, air purifiers, and air conditioning units. According to the U.S. Energy Information Administration, an average household uses approximately 11,000 kWh per year.

Solar Panel Wattage

Although solar panels might look similar, they are not all created equal. You will need to know how many watts the panels you want to install. The panel wattage refers to the power that the panel emits. Solar panels typically produce between 250 and 400 watts of electricity, so 300 would be the most common panel wattage.

Production Ratios

EnergySage states that a solar panel system's output ratio is the difference between the system's estimated energy output over time (inkWh) and the actual system size. This might seem like a 1:1 ratio, meaning that you only get what you put in. Variations in the amount and intensity of sunlight hitting your home can make this not true.

A system of 10 kW that produces 16 kWh per year will have a production rate of 1.6 (16/10 = 1.5). This type of production ratio is possible in Hawaii because of the long days and constant sunshine. New England, on the other hand, might only have 1.2.

Calculate the number of solar panels you need using a mathematical formula

Here is the EnergySage formula that you can use to calculate how many solar panels are needed.

  • System size/production ratio/panel wattage = number of panels
  • We get the following numbers using the numbers that we have so far:
  • Number of panels = 11,000kW / 1.6/300 W

This means that you will need between 20 and 25 solar panels to accomplish the task. This formula can be used to calculate how many solar panels are needed to power your home. You can also look at your energy bill and determine how many solar panels you will need.


Smart Solar New Haven

New Haven, AZ

(475) 278 9244