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15000 Watt solar system. 15000 watt solar system

15000 Watt solar system. 15000 watt solar system

    What Do Solar Panels Cost and Are They Worth It?

    Consider solar panels for your home if you have a high utility bill, live in a prime location and qualify for tax breaks or other savings.

    Lauren Schwahn is a writer at NerdWallet who covers debt, budgeting and money-saving strategies. She contributes to the Millennial Money column for The Associated Press. Her work has also been featured by USA Today, MarketWatch and more. Lauren has a bachelor’s degree in history from the University of California, Santa Cruz. She is based in San Francisco.

    Tommy Tindall Lead Writer | Consumer debt, saving money, gig economy

    Tommy Tindall is a personal finance writer who joined NerdWallet in 2021, covering consumer debt, practical ways to save money and the gig economy. Before NerdWallet, he worked on the marketing and communications team at Fannie Mae. Today, Tommy strives to make the topic of money approachable for all. His work has appeared in The Washington Post, The Associated Press and on MarketWatch. Tommy is based in Bel Air, Maryland.

    Courtney Neidel is an assigning editor for the core personal finance team at NerdWallet. She joined NerdWallet in 2014 and spent six years writing about shopping, budgeting and money-saving strategies before being promoted to editor. Courtney has been interviewed as a retail authority by Good Morning America, Cheddar and CBSN. Her prior experience includes freelance writing for California newspapers.

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    The rising cost of electricity from traditional sources and government incentives to go green make the idea of installing solar panels more attractive for many homeowners.

    But the true cost of solar panels, and whether they’ll help you save money. depends on a few key factors.

    How much do solar panels cost for homes?

    On average, solar panel installation and the system together can run from 15,000 to 25,000, according to the latest information from the Center for Sustainable Energy. Home services booking site Angi bumps that up, putting the normal range for solar panel installation in the U.S. from around 18,000 to 35,000 based on its database of completed projects.

    Before you make the leap, learn how your electric bill. location and incentives can impact your wallet over time. Here are five steps to take to determine whether you’ll save more than you spend on solar panels.

    Review your electric bill

    Solar panels generate their own power and can therefore greatly offset your monthly electricity bill. if not eliminate it. The higher your bill, the more likely you’ll benefit from switching. But be aware that electricity rates and usage — the main charges on your statement — are volatile.

    If a utility’s electricity fluctuate, so could the amount of savings, says Garrett Nilsen, deputy director for the U.S. Department of Energy’s solar energy technologies office. Similarly, if energy consumption changes, the amount of savings can also vary.

    Electricity rates vary by location. The national average is about 15 cents per kilowatt-hour, according to year-to-date 2022 data from the U.S. Energy Information Administration [0]

    Visit the EIA website to view the most recent per state.

    Evaluate your sunlight exposure

    sun means more energy produced and a greater potential to save with solar. Certain states, like Arizona and California, average more sunlight hours per day.

    Your home’s orientation toward the sun, the amount of shade it gets, and its roof type also affect a solar system’s output. You can estimate the efficiency of panels on your home using this solar panel cost and savings calculator from SolarReviews.

    Estimate and compare the cost of solar panels for homes

    The brunt of the expense with solar panels is in installation and the purchase of the actual panels.

    Minimal long-term costs can make up for the upfront costs. “Most systems don’t require much maintenance and are designed to last for 20 years or more with little change to the amount of electricity produced,” Nilsen says.

    When calculating the total price, consider how much energy you regularly consume — your usage is listed on your monthly utility bill — and what size system will generate the amount needed. Some tools, like the SolarReviews calculator, estimate the system size for you.

    With installation, an average residential 5-kW system costs from 3 to 5 per watt, according to the CSE, which results in the 15,000 to 25,000 range. That cost is before any tax credits or incentives.

    If you know your current energy usage, you can calculate how much you’ll need to pay for solar panels.

    Then comparison shop for solar panels as you would other big-ticket items, such as a car or TV, says Vikram Aggarwal, CEO of the solar marketplace EnergySage. Some companies reduce installation costs through rebates and other programs.

    Aggarwal recommends getting quotes from three to five contractors. EnergySage compiles solar companies’ customer reviews, certifications, Better Business Bureau profiles and other information to help you find reputable providers.

    Take advantage of government incentives

    A federal law passed in 2022 incentivizes consumers to make clean energy enhancements, like installing rooftop solar. A substantial update to an existing energy-related tax break that was set to expire at the end of 2023, the Residential Clean Energy Credit allows taxpayers who have solar (and other approved clean energy equipment) installed to recoup 30% of the cost in the form of a federal tax credit.

    What that means: A solar setup that costs 15,000 would yield a 4,500 credit (30% of 15,000) that you can take advantage of come tax time to reduce any federal taxes owed. The credit isn’t refundable though, meaning any money left over after your full tax bill is covered won’t be paid out to you. But you may be able to apply the remainder of the credit toward taxes owed in subsequent tax years.

    The credit applies to eligible equipment installed after Dec. 31, 2021, and remains in effect at the 30% rate through 2032. It decreases incrementally after that.

    Depending on your state, you may receive extra incentives like cash back, property tax exemption, waived fees and expedited permits. In some states, homeowners with solar panels can sell excess power to their local utility companies. Look up credits available in your state by reviewing the database of state incentives for renewables and efficiency.

    Keep an eye on trade policy

    Changes in government trade policy also impact prices. There have been varying tariffs on imported solar cells and panels over the last decade affecting costs and supply. For example, tariffs resulted in a 16-cent-per-watt increase for the average consumer in 2018, which translated to an overall increase of 960 for a 6-kW system, according to EnergySage.

    President Biden placed a two-year pause on new tariffs on the solar industry in June 2022.

    Is solar panel installation right for your home?

    If you live in an area with high energy rates and a suitable solar rating, and if you can afford the initial investment, it’s worth installing solar panels on your home while the 30% tax break is in place — for the good of the environment and your wallet. But don’t expect to eliminate your power bill overnight.

    If you decide to purchase solar panels, shop around and search for incentives. Consider financing with a solar loan if you’d rather spread out the cost over time. Keep in mind that you don’t have to buy solar panels — you can lease them, too. Leasing offers a lower upfront cost, though since you don’t own the panels, they won’t raise the value of your home, and you may not be eligible for incentives.

    Going solar isn’t the only potential way to save money. Learn more about what you can do to lower your bills.

    000 watt solar system

    Customer Testimonials

    “Having solar panels has given me reassurance that my bills will stay manageable.”

    — Kerrie Lane, Egg Harbor City, NJ

    With Sunrun, you can take control of your own electricity, and not be left at the whims of your utility company with the next inevitable rate hike. Join the more than a quarter of a million American households who have gone solar with Sunrun.

    Whenever you’re ready, our solar advisors are here to help. We can provide you with a free quote. Feel free to try our Cost of Solar Calculator.

    A single solar panel costs between 2.67 and 3.43 to buy and install. 4 The price of the whole system is based on its capacity, measured in watts. How big a system you need will be based on how much energy you use, your roof’s sunlight exposure and panel efficiency.

    The amount you save will rely on several factors, including: 18

    • Region’s sunlight exposure
    • Cost of solar system (including battery, where available)
    • Cost of electricity
    • Energy use
    • Local rebates and incentives

    The average payback period for a residential solar system is between six to nine years, depending on the cost of your system, incentives and savings from your energy bill. 19

    Here’s a closer look at some of the things that determine your system costs.

    Here’s a breakdown of installation costs, based on findings from the National Renewable Energy Laboratory: 10

    Category Cost Breakdown
    Labor 0.30 per watt
    Panels 0.47/Wdc
    Inverter 0.12/Wdc. 0.39/Wdc
    Permit/Inspection 0.06/Wdc
    Structural BOS 0.10/Wdc
    Electrical BOS 0.19–0.27/Wdc (Varies by inverter option)
    Sales tax Sales tax varies by location; weighted national average: 6.9%
    Electrician 19.74–38.96 per hour (Varies by location and inverter option)
    Laborer 12.88–25.57 per hour (Varies by location and inverter option)
    Burden rates (% of direct labor) Total nationwide average: 31.8%

    Figures based on the average 6.2 kilowatt residential solar system.

    These figures are based on the average 6.2 kilowatt solar system. The cost of each system will vary based on panel manufacturer, inverter option, location and equipment.

    Maintenance of solar panels ranges from routine cleaning to major repairs. On average, households pay 150 for one solar panel cleaning. 11 Companies charge between 3 to 10 per panel based on roof slant, home height and system size. 11 Some firms charge a flat rate fee for a system cleaning. If you clean your system twice a year, as recommended, you can expect an annual bill of about 300.

    If your system is damaged, you may incur additional expenses. Repairs to your system will include the of equipment and labor. Labor is typically priced at 100 per hour. Materials for solar repairs could be as little as 180 but may also be greater than 1,000. Your combined, total bill may range from 200 to 3,000. 11

    The four most common types of damage to a home solar system and the costs of repairs area: 11

    Category Cost Breakdown
    Broken glass panel 20 – 350, plus labor
    Cracked panel 100 – 400
    Loose connection 100
    Replacement inverter 100 – 2,500

    Like cleaning costs, the amount you pay for repairs is affected by things like roof steepness, system type and system size. And if your panels have extensive damage, it may be cheaper to replace them. 11

    When you own your system, you are responsible for the cost of maintenance and repairs. Your warranty should cover specific system failures; contact your installer before you begin repairs. A Sunrun solar lease, lets you save thousands of dollars in maintenance and repairs. You simply pay for the power, and we take care of the rest. Our comprehensive service package features the Sunrun Guarantee, which includes best-in-class monitoring, free equipment replacement, and system repairs including parts and labor, and routine maintenance.

    If you’re set on buying your own home solar system, you can also purchase our full-service package, Protection Plus. While the system is yours, we’ll give you the same comprehensive support that comes with our Sunrun Guarantee.

    Panel manufacturer

    The price of your panels will depend on the manufacturer. Sunrun partners with LG, a world leader in solar technology and panels. Striking the right balance between quality, efficiency and affordability, LG offers some of the best solar panels on the market today. 14

    For a given manufacturer, higher efficiency panels cost more. 5 The good news is that the highest efficiency panels aren’t always needed, especially if your roof gets plenty of sun.

    Your state

    Another factor in determining your total home solar system cost is where you live. Here are the states with the lowest and highest average solar system costs:

    Least expensive solar install Most expensive solar install
    Florida: 9,198 – 11,970 Rhode Island: 13,104 – 15,792
    Arizona: 10,332 – 12,096 New York: 12,264 – 16,044
    Maryland: 10,332 – 12,768

    after 30% federal solar tax credit 5

    Just because a residential solar system costs more in a given state doesn’t mean it’s any less cost effective. 5 Local incentives can make a huge dent in solar installation costs even in the most expensive states.

    The three most common kinds of solar panels are monocrystalline, polycrystalline and thin film. 6 Here are the essential features of each:

    Solar panel type Description
    Monocrystalline Monocrystalline are the most efficient on the market today, which means you need less panels to fulfill your energy needs. Monocrystalline solar cells are single-crystal silicon, giving electrons greater freedom to move and create electricity. 7 These panels are typically black, giving your roof a sleeker aesthetic. Monocrystalline panels also maintain their efficiency for longer and usually come with a 20 to 25 year guarantee. 6
    Polycrystalline Polycrystalline panels are made with many fragments of silicon. 7 While this makes them less efficient, it creates less waste in production and are more affordable. 6 They also tend to have a blue tint, likely the most recognizable feature of solar panels today.
    Thin-film Unlike monocrystalline and polycrystalline panels, thin-film isn’t made of silicon. Instead, it’s layered with photovoltaic materials on metal or glass. 8 While the least expensive option, thin-film isn’t as efficient and likely won’t cover the average household’s energy needs without taking up lots of space. 6

    ​The type of solar panel you choose will factor into the price of the system. But remember that if you decide to lease, you’ll be paying for the power rather than the panels. The cost of solar will come down to the amount of solar power you’re projected to use under your lease agreement.

    Solar panel mount types

    While solar panels are the main component of a solar system, how you mount the panels will also affect the cost. There are three mount types: 6

    Mount type Cost Description
    Fix-mount 10–15 per mount Fixed-mount are stationary and can’t be moved to capture more sunlight, making them less efficient than other mounts. However, they’re also the least expensive. In addition, states with consistent sunlight such as Arizona and California are the least affected by this.
    Adjustable-mount 50 per mount Adjustable-mounts can be tilted to maximize solar energy production. This mount type can also lay your panels flat during a storm to avoid wind damage. While they’re more expensive than fixed mounts, adjustable-mounts might make the most sense for regions with more seasonal climates and less space to maximize energy production.
    Tracking-mount 500–3,000 per mount Tracking-mount follows the sun’s arch for maximum energy production. Even though they’re the most expensive, track-mounting could add 45% in energy production and might be worth considering based on your location. However, track mounting also requires more attention and will be much more costly to maintain.

    kW Solar System UK: Price, How Much Does It Produce, How Big, and

    An 15 kw solar system for the right home or business should save around £81800 over the course of its expected 25 year lifetime. That’s based on grid electric costing £0.34/ kWh (last updated October 2022). That’s roughly £3274 per year in savings, without taking into account inflation or rising electric (which both add to your savings if you invest in solar soon).

    Rising Electric Costs

    The cost of electricity in the UK has consistently ‘outperformed’ inflation. You can see the last few seasons of price rises in this chart of Ofgem’s price cap rises:

    The amount that electricity costs continue to rise will have a large impact on whether you decide if solar is worth it for you in the UK.

    Smart Export Guarantee

    The Smart Export Guarantee replaces the older Feed in Tariff scheme. It allows you to get paid for excess energy that your 15 kw solar system produces but you don’t directly use yourself, for example if you’re out during the day when it’s sunny.

    Currently you can expect to get up to 15p per kWh of electricity you ‘export’, so for a 15 Kw solar system, with typical usage patterns, you could expect to receive around £1147 per year in payments under this scheme. This rate is available at the time of writing from Octopus Energy.

    Electricity Savings

    One of the main reasons to consider getting an 15 kW solar system is to save money by directly using the electricity it produces during the day, instead of paying the utility company. The more of your own ‘self generated’ electricity you use instead of buying it or paying for petrol if you’re also buying an electric car, the higher your savings.

    With a properly sized 15 kW solar system, you can expect to save around £2127 per year by using your own solar energy.

    watt, solar, system

    kW Solar Panel System Price

    An 15 kW solar system (without a battery) typically costs around £19000 in the UK. That’s including installation and VAT.

    You can get a free quote from Honest Quotes to get an exact price. They offer a Zero Upfront Cost option for those that qualify.

    Get a quote for solar and or battery installation across the UK from our partners Honest Quotes.

    How Many Solar Panels Do I Need to Power My House? (2023 Solar Guide)

    This guide has helped many homeowners determine the optimal solar system size for their home. Let’s get started!

    Each product and or company featured here has been independently selected by the writer. You can learn more about our review methodology here. If you make a purchase using the links included, we may earn commission.

    Written by Leonardo David

    Leonardo David is an electromechanical engineer, MBA, energy consultant and technical writer. His energy-efficiency and solar consulting experience covers sectors including banking, textile manufacturing, plastics processing, pharmaceutics, education, food processing, fast food, real estate and retail. He has also been writing articles about energy and engineering topics since 2015. Learn About This Person

    watt, solar, system

    Reviewed by Melissa Smith

    Melissa is an avid writer, scuba diver, backpacker and all-around outdoor enthusiast. She graduated from the University of Florida with degrees in journalism and sustainability studies. Before joining EcoWatch, Melissa worked as the managing editor of Scuba Diving magazine and the communications manager of The Ocean Agency, a nonprofit that’s featured in the Emmy award-winning documentary Chasing Coral. Learn About This Person

    Why You Can Trust EcoWatch

    We work with a panel of solar experts to create unbiased reviews that empower you to make the right choice for your home. No other site has covered renewables as long as us, which means we have more data and insider information than other sites.

    Jump to Section:

    Find the best price from solar installers in your area.

    Solar panel popularity has been on the rise but many still wonder if solar panels are affordable. Like many other products, with solar you do need to purchase a set amount of panels that will generate energy sufficient enough to cover the amount of electricity used in your home. The question at hand that we see the most from consumers to installers is how much will going solar cost and how many solar panels will we need.

    The truth is that the exact amount will vary person by person and based on a variety of different factors. No one solar situation is the same and with the different customizable preferences that exist such as types of panels, using solar shingles vs solar panels, and what part of the country you live in can impact how effective your panels are and thus how many you need to cover your basic energy output.

    With that said, the best way to discover how many panels your home will need is by speaking with a solar professional that will calculate solar panel outputs based on those factors and more. But for a rough estimate we’ve put together the same equation that professionals use to give you a better idea of what you might need.

    Again, solar panel systems are highly individualized, so your solar provider will help you customize your solar panel system to meet your needs and preferences and advice on panel wattage and system size.

    What Factors Affect How Many Solar Panels You Need?

    The size of your home and available roof space, the amount of direct sunlight your home receives, the type and efficiency rating of your solar panels, and how much energy your household use are all factors that affect how many solar panels you need. For example, if there are two identical homes powered by solar energy in California and New York, with exactly the same energy usage, the California home will need fewer solar panels because the state gets more sunshine. But two homes in the same neighborhood might not even need the same number of solar panels. It all comes down to the individualized needs of each household.

    SunPower

    SunPower designs and installs industry-leading residential solar and storage solutions across all 50 states. With a storied history of innovation dating back to 1985, no other company on this list can match SunPower’s experience and expertise.

    SunPower earns its position as the top national installer on our list for a handful of reasons: It installs the most efficient solar technology on the residential market, offers the most expansive service area and backs its installations with a warranty well above the industry standard. All the while, SunPower pioneers sustainability efforts within the industry.

    If that weren’t enough, SunPower systems come packaged with products all manufactured in-house by its sister company, Maxeon. This means that your panels, solar cells, inverters, battery and EV chargers are designed to work together and are all covered under the same warranty.

    SunPower’s biggest downside? Its high-efficiency panels are considerably more expensive than most of its competitors’ products. However, its powerful panels are workhorses that make up for the initial cost with more backend production (think about this like spending more money for a car that gets more miles per gallon).

    Facts and Figures: SunPower

    EcoWatch Rating Better Business Bureau (BBB) Rating Year Founded Average Cost (-) Solar Services Brands of Solar Equipment Offered Warranty Coverage
    5
    A
    1985
    Solar Panels, Solar Batteries, EV Chargers, System Monitoring
    SunPower Panels
    25-year all-inclusive warranty

    Blue Raven Solar

    We like Blue Raven Solar because it understands that, for most homeowners, the cost of solar presents the biggest barrier to entry.

    For that reason, Blue Raven Solar developed an innovative solar financing plan that offers in-house, flexible, zero-money-down options. The results speak for themselves, as Blue Raven Solar is now one of the fastest-growing solar companies in the nation and was recently acquired by SunPower. Its BluePower Plus plan (exclusive to Blue Raven) mimics the flexible structure of a lease while still providing the greatest benefits of owning your system.

    Eligible homeowners enjoy 18 months of solar power before having to pay their first bill. When coupled with the federal solar investment tax credit (ITC), the initial energy savings can offset more than a third of the overall cost of a system before requiring a dollar down.

    watt, solar, system

    In contrast, other installers can only offer similar financing through solar leases, PPAs or third-party providers (such as Mosaic or Sunlight). Third-party loan providers can complicate the process, while opting for a loan or PPA will disqualify you from some of solar’s biggest benefits (additional property value, federal solar tax credit and local solar incentives).

    Facts and Figures: Blue Raven Solar

    EcoWatch Rating Better Business Bureau (BBB) Rating Year Founded Average Cost (-) Solar Services Brands of Solar Equipment Offered Warranty Coverage
    4.5
    A
    2014
    Solar Panels, System Monitoring
    Trina Solar, Canadian Solar, SolarEdge, Silfab, SunPower
    25-year manufacturer warranty; 10-year workmanship warranty, 2-year production guarantee

    ADT Solar

    ADT Solar sets the industry standard for warranty coverage by including a multifaceted guarantee, making it one of the top installers for homeowners who want added peace of mind.

    Its warranty coverage includes all of the following for 25 years:

    • Power Production Guarantee: Also known as a performance guarantee, this ensures your solar system will produce the amount of electricity that’s outlined in your proposal, or ADT will write you a check for the difference.
    • Labor Guarantee: This covers any issues with the installation of your system and is also known as a workmanship warranty.
    • Panel Module Performance Guarantee: This is what ADT Solar refers to the manufacturer warranty as, and it ensures that any manufacturing defects are repaired or your ineffective panels replaced.
    • Enphase Microinverters Guarantee: This backs the performance of your inverters.

    Though in recent years other solar companies have started to offer similar guarantees, ADT Solar has been at it since 2008, performing over 30,000 installations across the country.

    Facts and Figures: ADT Solar

    EcoWatch Rating Better Business Bureau (BBB) Rating Year Founded Average Cost (-) Solar Services Brands of Solar Equipment Offered Warranty Coverage
    4
    A-
    2008
    Solar Panels, Solar Batteries, EV Chargers, Energy-Efficiency Upgrades
    Silfab, Panasonic and others depending on location
    25-year all-inclusive warranty

    The following are some of the most important factors to consider when figuring out many solar panels your house needs:

    The Size of Your Home and Available Roof Space

    Larger homes tend to consume more electricity, and they generally need more solar panels. However, they also have the extra roof space necessary for larger solar panel installations.

    There may be exceptions to this rule — for example, a 2,000-square-foot home with new Energy Star appliances may consume less power than a 1,200-square-foot home with older, less-efficient devices. When it comes to installation, solar panels can be placed on many types of surfaces.

    However, your roof conditions may limit the number of solar panels your home can handle. For example, if you have a chimney, rooftop air conditioning unit or skylight, you’ll have to place panels around these fixtures. Similarly, roof areas that are covered by shadows are not suitable for panels.

    Also, most top solar companies will not work on asbestos roofs due to the potential health risks for installers.

    The Amount of Direct Sunlight in Your Area

    Where there is more sunlight available, there is more energy that can be converted into electricity. The yearly output of each solar panel is higher in states like Arizona or New Mexico, which get a larger amount of sunlight than less sunny regions like New England.

    The World Bank has created solar radiation maps for over 200 countries and regions, including the U.S. The map below can give you an idea of the sunshine available in your geographic location. Keep in mind that homes in sunnier regions will generally need fewer solar panels.

    © 2020 The World Bank, Source: Global Solar Atlas 2.0, Solar resource data: Solargis.

    Number of Residents and Amount of Energy You Use

    Households with more members normally use a higher amount of electricity, and this also means they need more solar panels to increase energy production.

    Electricity usage is a very important factor, as it determines how much power must be generated by your solar panel system. If your home uses 12,000 kilowatt-hours (kWh) per year and you want to go 100% solar, your system must be capable of generating that amount of power.

    Types of Solar Panels and Efficiency Rating Used

    High-efficiency panels can deliver more watts per square foot, which means you need to purchase fewer of them to reach your electricity generation target. There are three main types of solar panels: monocrystalline, polycrystalline and thin-film.

    In general, monocrystalline panels are the most efficient residential solar panels, followed closely by polycrystalline panels. Thin-film panels are the least efficient.

    If you want to know for sure how many panels you need, you can click below to connect with an EcoWatch-vetted installer and get a free estimate.

    How Can You Estimate the Number of Solar Panels You Need to Power Your Home?

    So, based on these factors, how many solar panels power a home?

    To roughly determine how many solar panels you need without a professional assessment, you’ll need to figure out two basic things: what is your energy use and how much energy your panels will produce. We dive into these in more detail below, but here are the general steps:

    • Calculate how much energy your home uses
    • Assess your roof space and the amount of sunlight your home receives
    • Figure out the specific yield of solar panels in your area to estimate system size
    • Check the wattage of the specific panels you intend to purchase
    • Divide the wattage of your system by the solar panel wattage

    Determine Your Home’s Electricity Needs

    According to the latest data from the U.S. Energy Information Administration (EIA), the average American home uses 10,649 kWh of energy per year. However, this varies depending on the state. For example:

    • Louisiana homes have the highest average consumption, at 14,787 kWh per year.
    • Hawaii homes have the lowest average consumption, at 6,298 kWh per year.

    To more closely estimate how much energy you use annually, add up the kWh reported on your last 12 monthly electric bills. These numbers will fluctuate based on factors like the size of your home, the number of residents, your electricity consumption habits and the energy efficiency rating of your home devices.

    Electricity Needs for Common Household Appliances

    The size of your home is a major indicator of how many solar panels you need, but you also have to take into account your daily energy use. For instance, a household with common appliances — such as a refrigerator, dishwasher, stove, etc — will consume less electricity than a home that has an added heated pool, central air conditioner, hot tub and electric vehicle.

    These additional appliances and systems will dramatically increase your daily energy use, which means you will need more solar panels to offset your total energy consumption. As you plan your home solar system, make a list of all your appliances and systems so that all are accounted for in your final design.

    Product Average Annual Energy Use Number of Solar Panels Needed
    Television 100 kW/year 1
    Dishwasher 360 kW/year 2
    Oven 410 kW/year 2
    Dryer 470 kW/year 2
    Energy Star Refrigerator 615 kW/year 2
    Electric Vehicle 4,000 kW/year 12
    Electric Water Heater 4,500 kW/year 16

    assuming 350-watt solar panels are installed and average sun hours

    Solar Panel Specific Yield

    After you determine how many kWh of electricity your home uses annually, you’ll want to figure out how many kWh are produced by each of your solar panels during a year. This will depend on the specific type of solar panel, roof conditions and local peak hours of sunlight.

    In the solar power industry, a common metric used to estimate system capacity is “specific yield” or “specific production.” This can be defined as the annual kWh of energy produced for each kilowatt of solar capacity installed. Specific yield has much to do with the amount of sunlight available in your location.

    You can get a better idea of the specific yield that can be achieved in your location by checking reliable sources like the World Bank solar maps or the solar radiation database from the National Renewable Energy Laboratory. To estimate how many kW are needed to run a house, you can divide your annual kWh consumption by the specific yield per kilowatt of solar capacity.

    For example, if your home’s energy needs are 15,000 kWh per year, and solar panels have a specific yield of 1,500 kWh/kWp in your location, you will need a system size of around 10 kilowatts. Paradise Energy Solutions has also come up with a general formula to roughly ballpark the solar power system size you need.

    You can simply divide your annual kWh by 1,200 and you will get the kilowatts of solar capacity needed. So, if the energy consumption reported on your last 12 utility bills adds up to 24,000 kWh, you’ll need a 20 kW system (24,000 / 1,200 = 20).

    You can also visit this resource to get an idea of how solar panels may perform at your house.

    Watch below for more info on how your solar panels may be producing less electricity (watts) than what their power rating claims.

    How Much Roof Space Does Your Solar Panel System Need?

    On average, a solar system requires between 280 square feet and 350 square feet of roof space. Considering the average square footage of residential home roofs in the United States is 1,700 square feet, most people will not have any issues with solar panel installation.

    But if you have a smaller roof, it’s best to invest in higher efficiency panels because you will need fewer panels to cover your energy costs. To help estimate the required square footage for your home solar, we’ve created a table that estimates how much space you’ll need for the most common solar system sizes:

    System Size Estimated Monthly Energy Production Number of 350-Watt Solar Panels Minimum Required Roof Square Footage
    3 kW 200 – 520 kWh 9 160 sq. ft.
    5 kW 300 – 860 kWh 15 265 sq. ft.
    7 kW 430 – 1,210 kWh 20 355 sq. ft.
    9 kW 555 – 1,550 kWh 26 460 sq. ft.
    11 kW 678 – 1900 kWh 32 565 sq. ft.
    15 kW 924 – 2500 kWh 43 760 sq. ft.

    based on the installation of 350-watt panels and average sun hours

    The above estimates are based on the installation of 350-watt solar panels. If you decide to go with panels rated for more or less wattage, the required roof space will differ. For instance, you will need more roof space for panels with less wattage and less roof space for panels rated for a higher wattage.

    It’s fairly simple to determine how much roof space you need, just multiply the number of solar panels you need by their size. The industry average square footage of a solar panel is 17.55 square feet, but this number will vary depending on your panels.

    Below we’ve provided estimates for the amount of roof space you’ll need if you install a 9 kW solar system but choose panels with a wattage other than 350-watts:

    • 300-watt panels: 30 solar panels = 530 square feet
    • 325-watt panels: 28 solar panels = 500 square feet
    • 375-watt panels: 24 solar panels = 425 square feet
    • 400-watt panels: 23 solar panels = 400 square feet

    Conclusion: How Many Solar Panels Do You Need?

    Once you know how much electricity you use and the system size you need, you can check your panel wattage to figure how many panels to purchase for your solar array. Multiply your system size by 1,000 to obtain watts, then divide this by the individual wattage of each solar panel.

    Most of the best solar panels on the market have an energy output of around 330W to 360W each. The output of less efficient panels can be as low as 250W. So, if you need a 10-kW solar installation and you’re buying solar panels that have an output of 340W, you’ll need 30 panels. Your formula will look like this: 10,000W / 340W = 29.4 panels.

    If you use lower-efficiency 250-watt solar panels, you’ll need 40 of them (10,000W / 250W = 40) panels. Keep in mind that, although the cost of solar panels is lower if you choose a lower-efficiency model over a pricier high-efficiency one, the total amount you pay for your solar energy system may come out to be the same or higher because you’ll have to buy more panels.

    If you want to know for sure how many panels you need, you can click below to connect with an EcoWatch-vetted installer and get a free estimate.

    SOL-ARK 15K HYBRID SOLAR BATTERY SYSTEM

    The SOL-ARK 15K hybrid solar battery system combines the versatility of a standalone solar battery array with the convenience and flexibility of a home power grid. This intuitively designed system allows you to set your own electricity consumption levels while allowing you to monitor the status and performance of your battery efficiently through Wi-Fi. It’s also crucial that your battery saves sufficient power output to both recharge your home appliances and supply backup power when grid support is disrupted.

    This powerful battery inverter is capable of powering up to 17000 Watts of solar power. It also comes with a 10-year warranty.

    Sol-Ark 12K Hybrid Inverter Features:

    SOL-ARK 15K USER MANUAL SOL-ARK 15K SPECS SHEET SOL-ARK 15K BROCHURE

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