Sizes, Dimensions & Wattages

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Last Updated on 6th April 2024

Solar Panel Sizes, Dimensions & Wattages

Deciding on the right solar panel size, dimensions, and wattage for your home or business can feel a bit daunting, can't it? Residential solar panels in the UK typically range from 250W to 400W, whereas commercial ones might go up to 500W or more. The dimensions, which will impact the panel's efficiency and fit.

In this article, we are offering a rundown of common solar panel sizes, dimensions, and wattages.

See our top picks by our solar experts:

Panel MakeModelWattage(W)Dimensions
PerlightPerlight NTA415 - 4301686 x 1002 x 35mm
JinkoTiger Neo4201698 x 1002 x 30mm
JA SolarPERC5551776 x 1052 x 35mm

sizes and types of solar panels available in the UK

Understanding Solar Panel Sizes and Types

Before we delve into the various sizes and power capacities of solar panels, it's pivotal to understand that these aspects can greatly differ depending on the kind of solar panel in question. The requirements for a comfortable residential use can be quite distinct to those of an extensive commercial undertaking. Indeed, there is much to dissect here.

Standard Solar Panel Dimensions

There's quite a variety in the world of solar panels, isn't there? Typically, when we refer to the 'norm', our minds drift towards panels engineered specifically for domestic use. These are commonly dubbed as 60-cell solar panels and they undoubtedly form the backbone of solar installations in residences. Evidently, larger corporations tend to go for the 72-cell versions, because, let's face it, when it comes to energy provision for an entire office building or warehouse, size genuinely plays a significant part.

Standard Solar Panel Wattages

Wattage is like the horsepower of solar panels. More watts, more power. It's as simple as that. Residential panels typically have wattages ranging from a modest 250W to a super powered 400W. You'll want to think about how much juice you need for your home.

  • Smaller panels:  - Ideal for off-grid living or smaller energy needs.   - Power output can be as modest as 50W for those teeny weeny ones you might use on a boat.   
  • Larger panels:  - They’re the ones you rely on for the heavy lifting, especially in larger installations.   - You could see these bad boys providing over 400W each.

Remember, the majority of solar panels in circulation today, whether monocrystalline or polycrystalline, are of the crystalline variety. Monocrystalline panels are notably high in efficiency, elegantly designed, and correspondingly priced. Polycrystalline panels, by way of contrast, might be likened to their more economical relative - while they may lack the finesse of their counterparts, they are surely no less capable.

Panel Type      Avg. Length (mm)Avg. Width (mm)Thickness (mm)Avg. Wattage
Residential    ~1650            ~992            35-40          250-400W      
Commercial      ~1968            ~992            ~50            Up to 500W+  
Portable/Off-gridVariable        Variable        Variable      <50-200W      

Best 300W Solar Panels

glow green experts pick the perlight deltsa as the best 300w solar panel

Contemplating a transition to solar energy? It's natural you want to ensure your investment reaps fruitful financial benefits in the long run, right? Let's delve into the finest examples of 300W solar panels you can bank on. 

Switch your attention to the Perlight Delta to commence your journey. This formidable solar unit not only furnishes extraordinary power, slightly surpassing 300W, but also commands regard with an impressive efficiency rating of 21.4%. The icing on the cake? A robust 30-year warranty covering both product and performance aspects. Hard to find a flaw, wouldn't you agree? 

On the list, LG Neon R Prime could command your interest as well. Commencing at 350W and peaking in the high 300s, this particular model's efficiency and warranty are epitomes of value for money. An efficient performer at 21.5%, supported by an impressive 25-year warranty, this panel can be equated with a reliable ally - consistently dependable. 

However, don't rely solely on my analysis. Do explore the SunPower Maxeon 3 for yourself. This small yet powerful model scores high with its efficiency reaching the heights of 22.7%. In premium price territory? Undoubtedly, but factor in the game-changing 40-year warranty and it morphs into a wise long-term investment. 

What sets these particular panels apart? It's more than just their wattage. It’s the excellent combination of efficiency, dependability, and comprehensive warranties that endow these models with a standout status. For a clearer picture, why not take a look at this comparison chart I've put together to analyse how they fare when pitted against each other: 

Model          Power Range  EfficiencyProduct WarrantyPerformance WarrantyPrice Bracket
Perlight Delta405W - 425W  21.4%      30 years        30 years            £180 - £200  
LG Neon R Prime350W - 370W  21.5%      25 years        25 years            £350 - £500  
SunPower Maxeon 3415W - 430W22.7%      40 years        40 years            £350          

The ball's in your court. Driven by cost? Eager for efficiency? Troubled about warranty? There's the perfect panel out there for you.

Best 350W Solar Panels

glow green experts pick the perlight deltsa as the best 350w solar panel

Searching for top-tier solar panels is much like rummaging through a technology enthusiast's treasure trove, wouldn't you agree? You're after the pinnacle of performance, power efficiency, and most importantly, value for money. Keep a keen eye out for those exceptional panels which offer around 350W, these are the ones that afford astounding efficiency paired with robust warranties. 

But let's cut to the chase, shall we? 

The LG Neon R Prime stands out as a first-rate choice. This hardy panel delivers you around 350W to 370W of power, an admirable contender in terms of efficiency with a considerable 21.5%, and a commendable dual warranty on both the product and performance encompassing 25 long years. While the price tag of £350 to £500 might be a tad steep, many would argue it's worth every penny. 

If your pocket is yearning for something more cost-effective, you might fancy the Jinko's Tiger Neo 420W. Yes, it offers slightly higher than your 350W target, but considering the power range of about 400W to 420W and that similar alluring 21.5% efficiency, who's complaining? Toss in a price point of £170 and a 25-year warranty, you'll feel reaping the sunlight has stolen from the stars, and rightly so!

Now, here's the lowdown in one handy table you can reference anytime:

Model              Power Range (W)EfficiencyPrice RangeProduct WarrantyPerformance Warranty
LG Neon R Prime  350 - 370      21.5%      £350 - £50025 years        25 years            
Jinko Tiger Neo 420W400 - 420    21.5%      £170        25 years        30 years            

Best 400W Solar Panels

glow green experts pick the perlight deltsa as the best 400w solar panel

If you're in the market for high-performing 400W solar panels, you're spoilt for choice. These power-packed panels are ideal for those among us who wish to optimise energy yield without demanding an inordinate amount of roof space. Shall we delve into some of the premium choices available? 

First up, we have the Perlight NTA. This is a power behemoth, boasting an output peaking at 430W. As for efficiency? An unparalleled 22.28%. Talk about value for money, the Perlight NTA comes with a robust 30-year warranty covering both the product and its performance. 

Moving to the Trina Solar Vertex S, it's a crowd favourite with consistently high ratings. It promises a power range stretching up to 435W whilst maintaining an impressive efficiency of 21.8%. Also, its 25-year product warranty is not to be undermined. 

How about the SunPower Maxeon 3? It's among the elite, flaunting efficiency ratings reaching up to 22.7%. If durability is your thing, its 40-year warranty breaks all existing records. 

Lastly, the Jinko Tiger Neo 420W strikes an excellent balance between cost-effectiveness and premium performance. With an efficiency of 21.5%, it's an economical choice backed by a 30-year performance warranty for peace of mind. 

In the realm of solar panels, efficiency reigns supreme. And an extended warranty? That's merely the cherry on top. 

With a unique set of advantages for each panel, choosing can be tricky. To help your decision-making process, here's a detailed comparison:

Model            Power OutputEfficiencyPrice RangeProduct WarrantyPerformance Warranty
Perlight NTA    415W - 430W  22.28%    £175 - £22530 years        30 years            
Trina Solar Vertex S405W - 435W21.8%      £150 - £22525 years        30 years            
SunPower Maxeon 3415W - 430W22.7%      £350        40 years        40 years            
Jinko Tiger Neo 420W400W - 420W21.5%      £170        25 years        30 years            

Best 450W Solar Panels

glow green experts pick the perlight deltsa as the best 450w solar panel

LG NeON H BiFacial: How about more value for your money? These panels offer excellence in design and performance alike. Boasting an output that ranges from 430W to 455W, they sit right in the bullseye of power requirements. 

Efficiency? At 19.8%, it's certainly quite commendable, right? 

They bring along a generous warranty of 25 years for both product and performance. This quality does come at a slightly higher price, specifically in the £350 to £500 range. 

Are you still seeking more? Let's take a look: 

JA Solar 555W PERC: This panel is a true powerhouse – 550W! Now, remember, we are specifically seeking a 450W option, correct? However, knowing that a larger capacity is available is potentially a future consideration. 

These panels pursue power with gusto, achieving an impressive 21.5% efficiency and a solid 12-year warranty. 

The price you can anticipate is around £350. 

Model              Power OutputEfficiencyProduct WarrantyPerformance WarrantyPrice      
LG NeON H BiFacial430W - 455W  19.8%      25 years        25 years            £350 - £500
JA Solar 555W PERCUp to 550W  21.5%      12 years        N/A                  £350      

Wattage and Power Output

In essence, the wattage of a solar panel provides a glimpse into its capacity to produce power under perfect circumstances. 

For residential systems, this wattage tends to float between the range of 250W and 400W. However, in the realm of larger commercial panels, we could potentially see a substantial increase, with wattages potentially exceeding 500W. 

The energy output, or as some might call it, the power output of your solar panel is intrinsically linked with the wattage. To put it simply, the higher the wattage, the greater the power output.

Quick fact: The more wattage your solar panel has, the more energy it can produce in a given time.

Power Output (Wattage)Residential Solar Panel SizesCommercial Solar Panel Sizes
250W - 400W            Standard for home systems    500W+                        
                                                    Often used in larger setups  

Efficiency Metrics

When we discuss efficiency in the context of solar energy, we are essentially referring to the aptitude of your photovoltaic cells to transform sunlight into usable electricity. This is a cardinal measure because, truth be told, not all sunlight bestowed upon your panels will ultimately undergo this alchemical process. 

However, the development of solar panels has been nothing short of a technical odyssey, with their efficiency witnessing considerable enhancements. Indeed, the figures suggest that the run-of-the-mill cell efficiency oscillates between 15% and 22%. 

Efficiency RangeMeaning                              
15% - 18%        Standard efficiency for most panels  
19% - 22%        High-efficiency solar panels          

Solar Panel Installation Considerations

When considering a solar panel system for your home, the two key areas to focus on are roof requirements and choosing the right installer. Get these right, and you're halfway to a greener home.

Roof Requirements

  • Space: The area available on the roof is crucial. A substantial surface area is necessary for the placement of a considerable number of panels.
  • Structural Integrity: Capable of bearing the weight of the solar Photovoltaic (PV) system? Reinforcements might be essential for aged roofs.
  • Direction and Inclination: For those residing in the UK, a roof with a sunny disposition towards the south is perfect. The angle of the roof directly influences exposure to sunlight.
  • Obstructions: Are there architectural giants or towering trees obscuring the sunlight? Shade-casting barriers could significantly hinder your solar ambitions.
AttributeConsideration            Impact on Installation              
Roof SizeLarger roofs accommodate more panelsIncreases potential energy output
Strength  Structural assessment required    May necessitate additional supports
OrientationSouth-facing preferred          Maximises solar energy collection
Tilt AngleUsually between 10° and 60°    Influences efficiency
Shading  Presence of obstructions        Decreases solar panel efficiency

Choosing the Right Installer

Finding a trustworthy solar panel installer is like finding a good mechanic – absolutely vital! Consider this:

  • Certifications: Are they MCS accredited? You want a nod that they know their stuff.
  • Previous Work: Can they show you previous installations? Pictures are good, but a visit’s even better!
  • Reviews: What do others say about them? Scour the internet for the good, the bad, and the ugly.
  • Warranties and Services: What’s the deal if something goes kaput? Make sure you're covered.
Factor      Detail                Significance                  
AccreditationMCS Certificate      Ensures quality and adherence to regulations
Portfolio    Evidence of past installationsDemonstrates experience and skill
Reviews    Customer feedback      Offers insight into reliability and service quality
Aftercare  Warranty and maintenance termsProvides peace of mind post-installation

Remember, getting these steps right could save you a headache and some quid later down the road. So, have a chat with a few installers before putting down any cash.

Sizing Your Solar System

Factor                        Detail                                                    Importance                    
Average Monthly Energy Consumption (kWh)Check past electricity bills to calculate.            Determines the baseline for your needs.
Electricity Usage Pattern    Day vs. night usage, high-consumption appliances.          Influences the timing of energy use.
Solar System Size (kW)        The total output needed to match your usage, taking into account UK sunlight availability.Dictates capacity of the setup.
Home Solar Panel Count & Wattage
 Determined by system size and panel specifications.        Determines the number and type of panels required.

Sizing Your Solar System

Factor                              Detail                                                                            Importance                                    
Average Monthly Energy Consumption  Calculate based on past electricity bills.                                        Establishes your energy needs.                
Electricity Usage Pattern            Consider when you use the most electricity, such as during the day or at night.    Influences energy production and usage timing.
Solar System Size (kW)              Total output needed to meet your energy consumption, considering sunlight availability.Determines system capacity.                  
Home Solar Panel Count & Wattage    Number and wattage of panels required to meet energy needs within available space.Limited by available roof or install area.    
Energy Production vs. Consumption    Aim for solar output to exceed or match energy consumption for efficiency and savings.Directly impacts system effectiveness.        
Available Space for Panels          The physical area available for panel installation, often constrained by roof dimensions.Determines the maximum system size.          


    What's the typical size of a residential solar panel these days?

Residential solar panels in the UK typically measure around 190cm x 100cm x 4cm.

    Could you tell me the dimensions of a solar panel that produces around 1 kW?

A single solar panel producing around 1 kW may not be sufficient. You would likely need multiple panels totaling up to 1 kW.

    How much space would I need on my roof for solar panels that crank out 450 watts?

For solar panels generating 450 watts, you'll need a substantial amount of space on your roof. However, remember that efficiency also plays a significant role, not just wattage.

    What's the average wattage for panels that domestic solar setups usually use?

Domestic solar setups in the UK typically use panels within the range of 250W to 400W.

    Mind boggling ain't it, but how big's a hefty 400W solar panel?

A hefty 400W solar panel will occupy a significant portion of roof space. Remember, while size matters, it's not the only factor to consider.

    In terms of energy efficiency, what size panel would you recommend for a typical UK home?

For a typical UK home, balance panel size with energy needs. Whether it's a 3kW or 4kW system, avoid going overboard if it's unnecessary.