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Solar PV Sizing

Calculation for Solar Sizing depending on the Residential Load

1 bed

For small Apartments
1 to 2 bedrooms

Installed capacity power output = 2kWp

Total Annual consumption electricity = 1800kWh

Annual solar generation = 1550kWh

6 solar panels required.

Area required = 22m2

3 bed

For Medium Apartment
3 bedrooms

Installed capacity power output = 3kWp

Total Annual consumption electricity = 3100kWh

Annual solar generation = 2326kWh

10 solar panels required.

Area required = 27m2

4 bed

For Large Apartments
4 bedroom

Installed capacity power output = 4kWp

Total Annual consumption electricity = 4600kWh

Annual solar generation = 3100kWh

16 solar panels required.

Area required = 35m2

Solar Panel Costing!

What PV System Sizing Would You Need for Your House? How Many PV Panels Might Be Enough For Your Need? How would You identify the appropriate Solar PV Sizing for my home?

SEG–Smart Export Guarantee is compensated for the energy sent to the consumers' grid. It is a good replacement for the FiT (Feed-in-Tariff) Scheme, where funds are given for the generated PV power to residential owners to acknowledge the people for getting Solar. If you're considering going solar, you're probably wondering how many panels you'll need to meet your load demand.

Let's explore how to predict the accurate sizing of solar PV systems for your home in this article. This also highlights average UK household electricity consumption and standard PV panel dimension.

If you're curious about how much Solar electricity your place is capable of yielding, engage with Solar Panel Costing and schedule a survey with the best Solar Panels installers. Get quotes for the greatest solar panels.

What's on this page?

01 | What is the PV panel Size?
02 | Average PV panel dimension
03 | What exactly is a solar PV array?
04 | How much power does an average PV panel yield?
05 | The different solar PV systems Sizing
04 | Small solar PV panels
05 | Large solar PV panels
06 | Should you use small or large solar panels?
07 | What Solar PV Sizing would you deploy a photovoltaic system?
08 | Can your rooftop withstand the weight of your chosen PV system Sizing?
09 | How many numbers of Solar PV Panels Are Typically Deployed in a UK Home?
10 | Average monthly yield from solar panels
11 | The average annual yield by the PV panels
12 | How Much have Solar Panels Cost?
13 |What are peak or sunshine hours?
14 | Why 0.85 nominal value?
15 | How much electricity does your house use?
16 | Should you purchase a solar battery?
17 | Which Solar Panels Should I deploy?
18 | Monocrystalline in contrast with Polycrystalline PV panels
19 | How to figure out the appropriate PV array sizing for my home?
20 | How do find out suitable solar array sizing?
21 | How Can You Figure Out the Best Solar Panels Installers?

What is the PV panel size?

Solar panels for homes typically have a rectangular shape and have a surface area of around 2 square meters. They are usually two meters long, one meter wide, and three to five centimeters thick. Some manufacturing companies, however, have acknowledged the necessity of small panels, which are excellent for homes with small roofs. If you're searching for something really small, consider the following brands with small Solar PV panel sizes:

• Sharp’s 258.4W maximum power | NQ-R Series, Pallet size (1.02 m × 1.35 m × 1.52 m) measures 1.29 square meters
• The Panasonic 300W maximum power | N300 measures 1.54 square meters.
• The SunPower 370W maximum power | X-Series X22, which measures 1.63 square meters.

Also, you can deploy high-efficient solar panels on your roof as these high-graded panels are particularly effective at converting sunlight (photons) into electricity, with conversion rates ranging between 20 and 22 percent (the industry standard is closer to 18 percent).

Average PV panel dimension

There are several manufacturing brands of solar panels, each with a somewhat varied Solar PV panel size. However, one conventional PV panel dimension will be approximately 1.63 -2 square meters.


What exactly is a solar PV array?

A solar panel is fabricated from some solar photovoltaic cells. You've got a solar array when you combine many solar panels and link them in series or parallel connections to your home. Solar panels with 60 of these cells are used in the majority of household systems.

How much power does an average PV panel yield?

Residential PV Panels use normally have a power of 300W, although if you want a large solar system, you may want to get solar panels with maximum output powers of more than 400W. As a result, if you seek to expand a 1.2kWp solar array capacity, The maximum power of the solar panels would be 1200 Watt (since 4 x 300 Watt = 1,200 Watt). The same would apply to eight solar panels with a maximum power of 300W each, which would result in 2.4 peak kilowatt of power.

The different solar PV systems Sizing

Keep in mind that certain panel brands have a higher capacity and so may cover a smaller area of roof space. Please consider that the statistics for 'annual electricity production' are only approximations, as the output of your solar PV system will vary greatly based on a variety of environmental circumstances. Similarly, the expenses are estimates. However, if your roof contains a window or flue, the amount of area available for a solar panel system may be cut. Check out our solar panel costing guide to discover more about how much you can expect to pay for a new solar array.

pv sizing

pv sizing

You will be more economical if you install additional PV panels.

Small solar PV panels

There are numerous small solar panels available for use in powering a variety of off-grid battery-powered systems. For homes, they are not often considered because of reasonable-sized arrays. Instead of the standard two square meters, these are typically four times smaller, at 0.5 square meters - though the output is, of course, also smaller. Small solar PV panels are special because they can be adjusted to fit a variety of situations. You may use their various outputs and PV panel sizes to acquire just what you want for your battery. To store solar energy during off-peak hours, you'll need a solar battery.

Large solar PV panels

Domestic solar panels as large as 3.1 ㎡ are already available. Companies such as Risen Energy manufacture panels of this Solar PV panel size that can generate up to 670W - about twice as much as a regular panel - which makes sense given their size. Larger panels aren't inherently more efficient, and fitting them around obstructions on your roof might be difficult, but they can appear nicer and more consistent. Even if you have a huge roof facility to power, you don't have to acquire massive solar panels - although it occasionally makes more financial sense to go big for your house. However, they are made for industrial purposes.

Is it better to use small solar panels or large ones?

Small or large panels are equally effective. Deploying PV panels on your rooftop, providing you with optimal power, and doing so considering reasonable financing is important. PV panels of large or medium PV panel sizes would not fulfill the requirements for small off-grid homes. However, without considering how big or small the panels are, when it comes to typical standard rooftops, it's about making sure that your solar panels suit your budget, roof size, and load demands.

What Solar PV Sizing would you deploy a photovoltaic system?

It depends on the apartment sizing and how much power you consume yearly to forecast how big and how effective your solar array should be. Ultimately, how much power you expect from solar panels determines how many you need. It is common for household systems to range from 1 kW to 4 kW in power capacity. To provide 2,900 kWh of power annually for standard three-bedroom house size, a PV system sizing of about maximum power of 3.5 kW is needed. This would involve the solar panel installations of 10 solar panels of 350 kW maximum power, covering about 20 ㎡ on a regular roof - but your home isn't conventional.

Can your rooftop withstand the weight of your chosen PV system Sizing?

The weight of only one panel varies with the brand, but conventional 60-cell solar arrays used in most household systems weigh about 18 - 20 kg. Most homes have roofs that can easily sustain this weight; however, professional Solar panels installers would assess this as part of their first inspection. If you're looking for PV panels building, consider flexible PV panels, which are lightweight, weighing between 0.8 - 3.0 kilogram on average.

How many numbers of Solar PV Panels Are Typically Deployed in a UK Home?

For houses with more than 5 occupants, a 6kW solar panel PV system is better, whereas a 5kW solar panel system is typical for homes with 4 inhabitants. Because it is suited for residences with three to four occupants, among the most common PV panel sizes of household PV systems, a 4 kilowatt PV system is common. The quantity of solar PV panels required is determined by the solar PV sizing uses, whether it is 3 kW, 5 kW, or 6 kW. Twelve panels are required to build a 3kW solar PV system with a maximum power of 250W panels. A 6kW system would need the deployment of 24 solar panels. The normal quantity of solar panels will also be determined by whether you want your solar PV panels to produce all or a portion of your electricity. The average UK residential power utilizes each day is between 3kWh - 6kWh.

Average monthly yield from solar panels

Monthly energy bills can give information on how much energy you spend every day and, as a result, how much energy panels need to generate per day. If your monthly use in January is 124 kWh of maximum power, your daily consumption is 4 kWh on estimates, your solar PV system should yield 4 kWh each day on average.

The average annual yield by the PV panels

A peak kilowatt panel (1 kWp) capacity of PV system panel capacity will yield around 850 kWh, but a 4-kilowatt peak Power panel capacity will yield up to 3800-kilowatt peak Power panel capacity yearly. Hence, The bigger the PV panel sizing, the greater its annual electricity output. But what does the electric Jorgen "kilowatt hour” define? It is the total measure of energy that one kilowatt-rated load-driven appliance would require if it was energized for one hour. To be energized a Fifty-Watt bulb would utilize 1-kilowatt hour of power in twenty hours. A 2 Kilowatt microwave oven, on the other extreme, would use 1kWh of power in just 30 minutes. To quantify the electrical production of a solar panel kWh is used.

How Much have Solar Panels Cost?

Costing is an essential element in calculating how many PV panels you require. The cost of PV panels is determined by variant factors, including the Solar PV panel size and manufacturing types. PV panel systems with peak Power capacities between 3-12 kilowatt energy cost between 5,000 - 13,000 pounds. Other considerations that may influence the price of PV panels cover your location, price of panel manufacturing brand, location’s labor expenses, and Site difficulties that may need additional labor hours. The tabular below depicts of Solar panel costs per PV Panel sizing:

Solar PV Panel Size Number of Panels Payback years
2kW 6 6 to 7 years
3kW 10 5 to 7 years
4kW 16 6 to 7 years

*These values are based on solar panel installations with a 325-Watt maximum power of panels. These nominal values are designed to provide recommendations rather than precise costing. We always recommend receiving a price that is specific to your home.

What are peak or sunshine hours?

The quantity of electricity yielded by PV panels is influenced depending on the sunshine hours you get, the azimuth of panels facing solar irradiance, and their efficiency and effectiveness. During these peak hours, the sun is normally highest in the sky, and its rays fall at their most straight angle, hitting a specific geographical area. The seasons will also influence how many sunshine hours there are, with summer having the most and winter having the fewest. With an average of four hours of sun irradiance every day in the UK, you may undoubtedly profit from having a solar panel system installed. It is crucial to note that the solar shine hours per day vary geographically in the United Kingdom: England has 4.1, Scotland has 3.7, Northern Ireland has 3.2, and Wales has 3.3, and As a result, you should seek advice from your local Solar Panels installers. The average Sun irradiance in the UK for 2021 per month, is shown below.

The month of 2021 Average number of daily peak sun hours
January 1.9
February 3.0
March 4.2
April 6.3
May 6.7
June 6.4
July 6.4
August 5.5
September 4.9
October 3.0
November 2.1
December 1.48

Once you've determined how many peak sun hours you can forecast, for each solar panel, calculate the amount of power it will produce each day using the following calculation:
Daily sunshine hours x regulated specific PV output power of the system (kWp) x 0.85

Why 0.85 nominal value?

When maximum sun rays fall in each part of a square meter (㎡) area with the intensity of 1,000 Watts, solar panels can absorb more than roughly 85 percent of the energy and around 15 percent may reflect depending upon their manufacturing type and Solar panel cleaning. In the UK, a three-kilowatt peak power panel capacity (kWp) PV system anticipates electricity output in July 2021: The daily energy consumption for July is 8.7 x 3 x 0.85 = 22.2kWh. Meanwhile, its productivity would be substantially reduced in the middle of winter: In December, 1.4 × 3 x 0.85 = 3.6kWh per day. The seasons will influence the number of sunshine hours. A residency in southern England, will geographically plus point to getting more sun irradiation than one in Scotland.

Should you purchase a solar battery?

Solar energy generated in excess is returned to the grid if it is not consumed at the time it was generated. A solar battery, on the other extreme, offers benefits covering the ability to store surplus energy generated by your solar panels that are not utilized, as well as being less dependent on grid power and more ecologically conscientious. Even at non-sunshine hours, you may utilize solar energy to energize all of your load appliances. However, consumers' power is costly after the evening due to peak tariff rates. When the peak tariff rate is high, you may be able to use solar electricity. Households with battery storage use around eighty percent of the energy generated, whereas households that do not install solar panels with battery storage use forty percent of the power yielded. It is entirely up to you whether to include solar battery storage with your solar panels. Integrating solar panels with solar battery storage is the greatest option for reducing energy costs and decreasing your reliance on grid electricity. Deploying PV panels without a battery storage system may be an option if you want to cut your energy bills. Additional batteries will be required if you want to store power. A solar expert can advise you on several options and prices.

Which Solar Panels Should I deploy?

The type of solar panel used can be determined by efficiency, cost, and available space. Some varieties of solar panels are more efficient than others, affecting the number of panels required.
Monocrystalline panels, for example, require less area to install than thin-film and polycrystalline solar panels.
Solar panels of various varieties can be put on your roof, however, the most popular panels are monocrystalline or polycrystalline solar panels.

Monocrystalline in contrast with Polycrystalline PV panels Merit

Up to a twenty percent effectiveness rate over monocrystalline, however, polycrystalline solar panels have a 13-17 percent efficiency rate and polycrystalline is less expensive. The monocrystalline requires less solar panel installations space. When compared to other possibilities, monocrystalline panels are less impacted by weather vs polycrystalline has more temperature resistance.


Monocrystalline panels have the most costly form of solar panels and lower performance as temperature rises. On the other extreme, When compared to monocrystalline, the efficiency rate of polycrystalline is lower and it is more susceptible to high temperatures.

How to figure out the appropriate PV array Sizing for my home?

To explore the PV system sizing, you must first determine how much electricity you use from your solar system daily. The solar hours in your place and your roof space are other essential considerations. To figure this one out, ask yourself questions:

1) How much electricity does your home consume?
2) What is the size of your roof?
3) The sun hours in your area

The typical energy consumption - or projected usage - is the most significant criterion for estimating the number of solar panels you require. The total Kilowatt hours you use or intend to consume in your home are considered here.

The electricity yielded by PV panels is related to the sunshine hours, which is location-dependent. The number of PV panels that can be covered on the rooftop, the amount of electricity yielded, and the cost is all determined by the rooftop sizing. It is also required to consider the compliance of your rooftop, including whether it can handle the weight of PV panels and how the panels will be adjusted.

The following tabular nominal values present the PV panel dimension in square meters for PV panels to drive an appliance.

Size of the roof on expected PV panel size

Size of PV panels Number of 300-Watt PV panels Estimated surface area
2kW 6 22m(square)
3kW 10 27m(square)
4kW 16 35m(square)

* Table based on a 325 Wp Panel with surface area in a square meter of 1.6m x 1 m = 1.6m(square)

How Can You Figure Out the Best Solar Panels Installer?

It is essential to locate the proper solar panel installations that can advise you on the best system and carry out the process effectively. When seeking solar panel installers, get many quotes to verify you are getting a reasonable price.

It is also a good idea to search the background of Solar PV panel installers assuring that they have the proper certifications and a track record of happy customers. Engage with Solar Panel Costing and schedule a survey. Get quotes for the greatest solar panels and one of our knowledgeable Solar Panels installers will call you.