Complete Solar Evaluation Now!

See information about...

Rooftop Solar Panels New Jersey - Residential Solar Power Energy

Immediate Savings

Fixed Costs

Federal Incentives

Zero Out of Pocket

Serving All New Jersey

Solar Panel Sizing – Sizing A Solar System For Home | How To Calculate Home Solar System Size

How to size a solar system

There is no one-size-fits-all answer to this question, as the size of the solar system you need for your home will vary depending on a variety of factors. However, there are some general guidelines you can follow to help you determine the right size for your needs.

To calculate the size of your solar system, you will need to know your daily kWh energy requirement and peak sun hours.

In most cases, the average home will need a solar system that has about 5 kilowatts (kW) of generating capacity.

Getting Started with Solar System Sizing

When sizing a solar panel for your home, there are a few factors you will need to take into account. The first is how much electricity you use on an average day. You will also need to know the size of your roof and what kind of sunlight it receives. Once you have these figures, you can begin to calculate the panel size solar system you will need.

Estimating of Your Energy Usage

Estimating your energy usage can be easy, but it is also important to understand how much electricity you will be using on a monthly basis. Your budget also plays an important role in estimating your energy usage.

The first step in estimating your solar system size is to find out your average kWh usage during each season. You can do this by checking your energy bills or contacting your local utility company. Once you have this information, you can use a solar calculator to estimate the size of the system that would be right for you.

1. Calculate Your kWh Usage

To calculate your kWh usage, gather your electric bill from the past 12 months and add it up. This will give you an approximation of your yearly kWh usage. To estimate your average daily kWh usage, divide your monthly usage by 30. This will give you a better understanding of how much electricity you use on a daily basis.

2. Look Up Your Peak Sun Hours

To determine how many hours of sunlight your home will receive, you can use a sun hours chart. This tool will help you figure out when the sun shines the brightest in your area so that you can plan your solar energy usage accordingly.

To size a solar system for your home, you need to know your peak sun hours. This is the number of hours in a day when the direct sunlight is strongest. You can find this information by looking up your zip code on the National Renewable Energy Laboratory website. Once you have this number, add up the wattage of all of your appliances and devices that use electricity and divide by 1000 to get your approximate daily kilowatt usage.

sizing solar system for home

3. Calculate the Size of Your Solar System

To calculate the size of your solar system, you will need to know your daily kWh energy requirement and peak sun hours. The first step is to divide your daily kWh requirement by your peak sun-hours to get the kW output you need. This number tells you how much kW of power your solar system needs to generate each day.

The next step is to divide the kW output by your panel’s efficiency to get the total number of solar panels for your system. Efficiency is expressed as a percentage, so if you have a panel with an efficiency of 18%, then divide the wattage by 0.18 to find out how many panels you need.

This calculation will tell you if you need a roof-mounted or ground-mounted system. Solar panel mounts come in two main styles, roof-mounted and ground-mounted. Roof mounts are easier to install but they can block the view from your windows. Ground mounts have a lower profile, so you might not even know they are there, but ground mounts take more time and effort to install.

3 ways to calculate solar system size

There are three ways to calculate solar system size- by wattage, by square footage, or by the number of panels. Each method has its own benefits and drawbacks. You should choose the calculation method that best suits your needs.

1. PVWatts

PVWatts is a free online tool created by the National Renewable Energy Laboratory (NREL) that can calculate solar output down to the hour. It takes into account variables such as location, roof orientation, and shading to provide an estimate of how much energy a solar system will generate. The tool can also show you how much money you will save over time.

2. SolarReviews calculator

The SolarReviews solar system sizing calculator is easy to use- you simply enter your address and it will give you an estimate of how much solar power you need. It takes into account things like the average amount of sunlight your location receives and your electricity usage. This makes it a great tool for sizing a solar system for homes.

The SolarReviews calculator is easy to use for homeowners. It was designed with the average homeowner in mind, so it is straightforward and uncomplicated. You can quickly get an idea of how much solar power you need for your home by using this handy tool. It is a great tool that allows you to see live prices for solar systems from pre-screened installers in your area. You can enter your zip code and get an instant estimate of how much a solar panel system would cost for your home.

3. Solar company

When considering solar for your home, it is important to work with a reputable solar company. They will be able to calculate the size of the system you need and provide you with a free quote. This will help you make an informed decision about whether or not solar is the right choice for you. Solar companies will also be able to help you with the installation process and make sure that it is done correctly.

What factors determine the right solar system size for you?

The right solar system size for you depends on your needs, your current solar system setup, and how much space you have available. If you have a large yard and you currently use a small system, you may want to consider upgrading to a larger solar system. If you have a small yard, you may want to go with a smaller system.

The size of a solar system is the total amount of electricity it can generate. It is important to size a solar system correctly, as an undersized system will not meet your energy needs and an oversized system will be more expensive. There are five key factors that determine solar system size: your usage, solar insolation, and weather, roof characteristics, system losses, battery storage.


When sizing your solar panels, it’s important to take into account how much electricity you use on a monthly basis. You can find this information by looking at our home appliances power consumption table. This will help you determine how large of a system you need in order to offset your monthly usage and save money on your energy bill.

Solar insolation and weather

Solar insolation is a measure of the average amount of sunlight a location receives. The higher the solar insolation, the more sunlight that location will receive. Solar insolation can be affected by weather conditions, such as clouds or rain.

Roof characteristics

The orientation and pitch of a roof determine the angle at which solar panels will be effective in gathering solar energy. In order to maximize the amount of sunlight captured, it is important to consider these factors when installing solar panels.

System losses

All solar power systems experience some level of system losses. The amount of loss that a solar system experience is impacted by climate, latitude, and the orientation of the installation site.

Battery storage

Adding battery storage to a home solar power system can have a considerable impact on solar system size. This is because, in order for battery storage to provide backup power during an outage, the battery bank must be sized large enough to support the entire load of the solar array and home or business. The amount of backup power required will determine the impact on system size.

Average system size and power output by location

There are a number of factors that affect the size of a solar system. One of the most important is weather conditions, as they can impact how much power the system can generate. To calculate the average solar system size at a given location, historical data is used. This data takes into account things like average sunlight hours and weather patterns.

Solar system size is also impacted by the number of people living in a home or business. A larger solar array can be installed to support more than one person, but it’s important to consider the energy needs of each person in the home. The average number of people in a household is used to determine how much power each person needs.

Space requirements based on roof solar panel

Generally, every square foot of roof space has the potential to generate about 15 watts of the solar energy system. A solar panel installation on a small home might only need around 200 square feet of roof space, while a larger home can require more than 1,000 square feet of roof space to properly offset electricity usage.

The amount of electricity each person needs depends on the number of appliances used in the home. A basic home solar system can offset a small refrigerator, television, and lights for one or two people. If more appliances are used, a larger solar system is needed.

Homes with more than two people need to have at least 1 kilowatt of solar power installed on the roof. This will offset the electricity used by a refrigerator, television, two lights, and a computer.

A larger solar system can offset the energy needs of a home that uses more appliances. For example, if three people in-home use a computer, television, and lights on a regular basis, at least 3 kilowatts of solar power should be installed.

If the appliances in the home are energy efficient, less solar power is needed. If a home uses energy-efficient appliances, 1 kilowatt of solar power can offset the electricity used by two people in a home. This means that a family of four will need at least 4 kilowatts of solar power. A home with more people or appliances may require even more solar power to offset the electric bill completely.

Solar panels are available in different sizes. A 1-kilowatt solar panel is about the size of a sheet of plywood and can be mounted on an average house roof. A 4-kilowatt solar panel is about the size of a twin bed mattress.

Solar panels are usually sold in kits that include all the equipment needed such as solar inverters to install them and connect them to an electrical grid or battery system. A typical solar panel kit costs between $10,000 and $20,000 for a home with electric bills of about $200 per month. Solar panel kits are available from solar equipment suppliers and some home improvement stores. A roof solar panel kit can also be installed by a solar contractor.

How many solar panels do I need for a 2000 sq ft home?

A solar array that is 4,000 watts is allowed for a 2,000 square foot home. Depending on the type of solar panel you choose, this size system would be between 12 and 18 solar panels. Keep in mind that this calculation for how much power your solar array will produce depends on who provides your electricity. Solar panels needed for a home are generally sized at 4,000 watts.


What does solar system size mean exactly?

The output of a solar system is measured in watts. The peak output of DC electricity that a solar system may generate is known as its size. PVWatts, the SolarReviews calculator (suggested), or asking a local solar firm can be used to determine a solar system’s size.

How do I calculate what size solar system I need?

You need to select the size of your home and then look up how large a solar system that would be. If you are unsure about how to calculate the size of your home, you can always contact a solar installer and ask them for help.

What is the standard solar panel size?

Typical residential solar panel dimensions today are about 65 inches by 39 inches, or 5.4 feet by 3.25 feet, with some variation among manufacturers. Solar panel size is limited by the customary width of a standard-sized home. The panels are mounted on racks that typically occupy about one-third of the roof space, leaving two-thirds available for other uses or to accommodate future expansion.

If you would like to know if we can install solar and put thousands of dollars in your pocket for doing it, use the form below to submit your electric bill for a no cost, no obligation evaluation.