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How Many Solar Panels Am I Allowed On My Roof

Preserve Peace Of Mind

How This Roofing Company Is Taking On Teslas Solar Roof

Rooftop solar panels with battery storage generate electricity and provide a backup power solution. During an outage, Brightbox keeps preferred circuits powered. Our energy storage system enables you to run four 15-20 Amp, 120V circuit breakers for approximately 8 to 12 hoursenough to keep essentials humming until the sun rises.

Solar cant change the weather. But, having electricity during an outage gives you peace of mind and a value beyond money.

What Will A 100w Solar Panel Run

A single 100-Watt Solar Panel can power up several small devices which include cell phones, lamps, fans on ceilings, router of wifi, laptops and other small devices. Bigger appliances such as heaters, TVs, air conditioning systems, and others similar to these require more than one 100-Watt Solar Panel.

How are solar panels attached to the roof of a motorhome?

Also included is an 8 metre cable with the correct connectors already fitted. SunWorks FLEX kits contain semi-flexible solar panels which are attached directly to the roof of your motorhome, with a suitable adhesive. They are very lightweight and can follow the contours of your motorhomes roof.

Which is better ground mounted solar or roof mounted solar?

In many cases, ground-mounted solar panels can be your best option. If your roof isnt at the right angle, doesnt face south, or has obstructions like chimneys or skylights, then your solar array will be less productive. On the other hand, ground-mounted solar panels can be located wherever the conditions are best.

How To Measure Your Roof

The most accurate way to measure your roof entails climbing up there with a tape measure.

This roof estimate tool, which factors in skylights, vents, and dormers, delivers an accurate enough estimate for the cost of a roof replacement.

Once you take your measurements, compare the square footage figures between your roof and your solar system.

Your roof will suffice as long as you have more space than the estimated square footage your solar array will occupy.

If you have enough space, but the numbers seem too close for comfort, look to install high-efficiency solar panels. These panels produce more power per square foot, which means you can fit the system you need in a smaller area.

If you cant make the space room for rooftop solar, consider ground-mount solar panels and community solar programs.

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Energy And Usage Production

You need to determine how much energy the solar panels can produce after ascertaining the roof capacity. You should also arrive at the average power that you may consume. This comes to a point where, with the given roof capacity, the number of solar panels installed, the required energy, and the energy produced by the panels, whether you will end up having excess or deficit energy.

How Much Solar Power Can You Generate Based On Your Roof Size

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Another way to segment solar generation potential is by roof size. Below is a chart comparing solar generation potential based on roof size, assuming all of the same metrics as before: 320-watt solar panels, 17.5 square foot panels, and using every inch of roof space available for solar. The last assumption here is important to call out, because in reality, you cant use every inch of space on your roof for solar. Panels cant go out to the very edge of your roof, and youll more than likely have obstructions like vents or chimneys that take up space as well.

Bear with us here, these numbers are about to get a little bit silly.

How much energy can differently-sized roofs produce?

Roof size

*Assumptions: 17.5 square foot/320-watt solar panels, 5 sun-hours per day

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What Is The Average Number Of Solar Panels In A Uk Home

One of the determining factors in figuring out how many solar panels you need is the number of people in a household. A 6kW solar panel system is recommended for a home with over five people, while a 5kW solar system is typical for a home with four people. A 4kW solar system is one of the most common sizes for domestic solar systems, as it suits homes with 3 to 4 people.

The number of solar panels you need will vary depending on whether your installation is a 3kW or 6kW, and the size of solar panels you will use. For example, if you install a 3kW solar system using 250W panels, then you need 12 solar panels. A 6kW system would need 24 solar panels.

The average number of solar panels will also be determined by whether you would like your solar panels to generate all your electricity needs, or only a percentage.

An average UK home consumes between 3kWh and 6kWh of energy daily, and some UK homeowners use solar energy to power only parts of their energy consumption, which would then reduce the number of solar panels installed.

Also Check: How To Determine Number Of Solar Panels Needed

How Many Solar Panels Can You Fit On Your Roof

On average, solar panels measure about 17.5 square feet in size. To calculate how many panels can fit on your roof, simply divide your open roof space by 17.5 square feet . For example, if you have 1,000 square feet of open, available roof space, that works out to enough space for about 57 solar panels.

Read Also: How Much Should A Flat Roof Cost

What Size Solar Panel Do I Need

The size of PV panels you need depends on several factors. These include how much energy is used by your household throughout the day, where in the UK you live, and how much power your panels can generate.

Instead of spending time trying to figure out the PV panels size you need, you can get an estimate of how many panels you need in a matter of minutes using our free tool! Even better – well give you an accurate estimate of what to expect in terms of savings, cost, and system wattage. Youre also able to choose to see the impact of adding a solar battery or EV charger to your system.

If you choose to proceed, your Guru will discuss how the amount of solar panels you can fit on your roof compares to how many panels would be enough for your energy needs and give you different options to consider. At the remote survey stage, your Guru will also model the exact placement of solar panels on your roof.

Solar Panel Output Per Square Metre

How many solar panels do I need on my RV?

The most popular domestic solar panel system is 4 kW. This has 16 panels, with each one:

  • around 1.6 square metres in size
  • rated to produce roughly 265 watts of power

To work out the output per square metre, use this formula:

Number of panels x Capacity of solar panel system

Capacity ÷ Total size of system


  • 16 panels of 265 W each:
  • 16 x 265 = a capacity of 4,240 kW
  • Total size of the system
  • 4,240 ÷ 6 = 165 W per m2

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How Much Energy Do Solar Panels Produce For Your Home

Key points:

  • Most residential solar panels on todays market are rated to produce between 250 and 400 watts each per hour.
  • Domestic solar panel systems typically have a capacity of between 1 kW and 4 kW.
  • A 4 kW solar panel system on an average-sized house in Yorkshire can produce around 2,850 kWh of electricity in a year .
  • A solar panels output depends on several factors, including its size, capacity, your location, and weather conditions.

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Factors To Consider When Determining How Many Solar Panels You Need

When determining how many solar panels you need, its important to start by thinking about what your goals are and why you want to go solar in the first place. Do you want to maximize your return on investment? Do you want to save as much money as possible? Do you want to reduce your upfront costs? Do you want to have the biggest environmental impact and reduce your carbon footprint as much as possible? Most people want a balance of these goals, and may have other priorities as well, so its helpful to get a clear idea of what your specific end goals are before you start designing a solar power system.

Once you have your goals in mind, then you can determine how many solar panels you need to get there. This calculation is going to depend on how much energy your family uses, how much roof area you have available for solar panels, the location of your home and the angle of your roof, how much sunlight shines in your part of the country, the efficiency of the solar panels youre using, and if your local utility offers net metering. Plus, you also need to consider your budget, because a large solar power system might produce more energy, but its going to cost more for the initial installation as well.

Here are a few things you should think about when determining how many solar panels you need for your roof.

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Advantages Of Solar Energy

1. Renewable

Solar energy is the one of the most effective sources of renewable energy because of the reliable amount of sun the world gets. The ever-advancing technologies that are emerging will continue to harness this source in better, easier and cheaper ways making solar the fastest growing renewable energy source.

2. Clean

The carbon footprint of solar PV panels is already quite small and, as the materials used in them are being increasingly recycled, it continues to shrink.

3. Save money

Your electricity bills could decrease quite a bit because of the power you are generating and using, and not buying from your supplier.

4. No permit required

As solar panels are considered permitted development you usually don’t need a permit to install them on your roof. There are a few limitations you need to bear in mind before installation.

5. Low maintenance

Once installed, solar panels require very little maintenance. They are generally installed at an angle which allows rain to run off freely, washing dirt and dust away. As long as you keep them from becoming blocked by dirt, solar panels could last for over 25 years with little loss in efficiency.

6. Independence

Investing in a solar power system makes you less reliant on the National Grid for your electricity. As an energy generator, you can enjoy cheaper electricity throughout the day. And if you invest in battery storage, you could carry on using solar energy after the sun goes down.

7. Efficient

9. Property value

Should I Consult With A Solar Panel Installer First

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Whether your roof is new or old, it is best to consult with a solar panel installer or a roofing expert to arrange for an inspection to be done on your roof.

The expert will be able to assess if your roof is damaged in any way, and can advise on whether PV panels are appropriate for your roof and if it is stable enough.

A solar panel installer can also give you an estimate for the solar panels required, and advise on what solar panel installation style would suit your roof best.

If your roof is damaged in any way and solar panels are still installed, it will likely cause bigger problems down the line. Including solar panel failure, leaks, and a lack of solar energy which can be avoided by booking an inspection ASAP!

Remember although the cost savings will bring your power bill down, re-roofing your house could wipe out the benefits quickly. If you are the homeowner, we recommend speaking with a professional at the beginning.

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How Big A System

With a 3.5kw system now costing about £6,500 and annual returns of £800 plus, getting solar PV panels installed really is an attractive investment opportunity.

The key to making the numbers work though is maximising the number of panels you can squeeze onto your roof, because regardless of the size of system, you are still going to need things like inverters and cabling to run through the home, so the actual cost of adding an extra panel is not really going to add that much to the final cost of the system.

Most solar panels are 250 watts therefore to get a 3.5kW system you would need 14 panels.

250 watt solar PV panels are all pretty much a standardised size they are around 1.6m x 0.9m and about 5cm thick.

For example the Suntech 250w monocrystalline panel is 1665mm x 991mm x 50mm, whhereas the Sanyo/Panasonic panel is 1610mm x 861mm x 35mm, but broadly speaking they are all in that range. Therefore when sizing your solar PV system we recommend using this to drive your calculations.

With a panel therefore being approximately 1.44m2 in total, to get 14 panels on a roof you need a space of about 20m2. However roof-mounted solar installations must also be more than 30cm away from the external edge of the roof, meaning that actually you will need an even larger space so this needs to be factored in to any roof sizing calculations.

Divide Total Daily Watt

Now its time to work out how many panels you need to generate enough electricity for your requirements. To do this simply divide the total daily watt-hours, calculated in step 3, by the total amount of electricity used, calculated in step 1.

The final formula looks like this:

12 / 1.06 = 11.32

So for our example, we need to install around 12 panels to meet 100% of our electricity requirements.

Note: A higher watt panel can reduce the total number of panels required. For example, if we installed 350-watt panels this would reduce the total number of panels required to 10.

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Battery Storage Increases Energy Freedom

Harness and store the suns abundant energy. Across America, homeowners are installing battery storage systems with their solar panels.

A recent study predicts that by 2023, 90% of residential solar systems will include battery storage.6 Sunrun’s Brightbox battery storage gives you the freedom to choose affordable, reliable power without inflated rates or usage restrictions.8

Disclaimer About This Tool

Why I Didnt Go With Tesla Solar For My Home Solar System

Of course, the methods described in this article for making a rough calculation are just to give you a quick way to figure out how many panels you might be able to fit on your roof. Itâs no substitute for working with a professional solar installer who will include a site layout with your solar quote and explain in detail which sections of your roof are best suited for solar panels.

Theyâll also be able to identify obstructions, shading, and other issues.

When youâre ready to work with a professional contractor for your home solar panel installation, fill out our form to get quotes from up to three qualified solar installers.


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Type Of Solar Panel According To Cell Type

Performance is the ability of the panel to produce electricity when sunlight strikes it. The technology used to manufacture the cells contained in the photovoltaic panel will affect its performance, and there are essentially three types of panels.

Type of solar panel
Amorphous 8 to 12%

Crystalline panels give the best results in performance and are currently used for the installation of photovoltaic panels in homes. Amorphous panels are cheaper but are currently in disuse due to their low performance and shorter useful life.

Solar Energy Information Before You Install

Thinking about solar? Heres what you need to know before you buy.

1. You can live in cloudy Britain and still use solar panels

How solar panels work in the UK is exactly the same as anywhere else. You dont have to live in an area with wall-to-wall sunshine to generate solar energy. Solar panels work even through clouds. However, the more sunshine you get, the more energy youll generate.

2. You need a south-facing roof

Ideally, you need a south-facing or south-west facing roof. With the latest technology most homes could benefit from solar PV. Only north facing roofs are not suitable.

3. You shouldnt need planning permission

Good news most homes dont need planning permission to install solar panels. However, if you have a flat roof or live in a conservation area you might want to check with your local council before going ahead.

4. You can still switch suppliers

Of course, you are still free to switch suppliers if you have solar panels. No matter which energy supplier youre with when you get them fitted, you can still change.

5. You may want to consider a Smart Export Guarantee tariff

After installing solar panels, you may be eligible to sign up to a SEG tariff. SEG allows you to earn money for solar energy you don’t use. You’ll get a set rate for each unit of electricity you export to the grid. It’s worth knowing, with our SEG tariff, you’ll also need a smart or half-hourly electricity meter.

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Are There Warranties On The Solar Panels Youre Installing

Most major solar panel manufacturers do include warranties on their solar panels. When youre speaking to a company about installing solar panels on your home, you should ensure that the panels they install have a performance warranty and if they cover the full life of your new solar panels.

The photovoltaic cell panels that we install at Sun Badger Solar come with a 25-year warranty that we also match with our workmanship warranty. You can rest assured that your solar panels will continue to produce electricity for many years to come!

Explore our solar financing options to find the solar payment solution that is best for you.


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