Flexible Solar Panels: Costs, Types & Are They Worth It?
Flexible solar panels are thin, lightweight, and bendable — making them ideal for curved roofs, campervans, boats, and structures that cannot support the weight of traditional rigid panels. But are they the right choice for you?
Quick Answer
Flexible solar panels are ultra-thin photovoltaic panels (typically 2–3mm thick) that can bend to fit curved surfaces. They cost £100–£300 per panel (£1–£2 per watt) in 2026 and are best suited to campervans, boats, sheds, and curved or lightweight roofs. They are less efficient (10–22%) and shorter-lived (5–15 years) than rigid panels (25–30 years), so they are not a like-for-like replacement for a standard rooftop system — but for the right application, they are the only practical option.
What are flexible solar panels?
Flexible solar panels are photovoltaic panels built on a thin, bendable substrate instead of the rigid glass-and-aluminium frame used in standard rooftop panels. They are typically just 2–3mm thick, weigh 1.5–3kg (compared to 18–22kg for a rigid panel), and can flex to follow curved surfaces with a bend radius as tight as 30° on some models.
The solar cells are usually encapsulated in a durable polymer (ETFE or PET) rather than tempered glass. This makes them significantly lighter but also less protected against the elements, which is why their lifespan is shorter than rigid panels.
Flexible panels have been used for decades in marine and military applications. More recently, falling costs and improved cell efficiency have made them popular with campervan and motorhome owners, boat enthusiasts, and homeowners with non-standard roofs — such as curved barrel roofs, flat rubber (EPDM) roofs, and lightweight outbuildings that cannot bear the weight of rigid panels.
Most flexible panels available in the UK today use either monocrystalline silicon cells (the same technology as rigid panels, just thinner) or thin-film technologies such as CIGS and amorphous silicon. Power output ranges from 50W for small portable panels up to 400W+ for larger rooftop-grade flexible panels.
Flexible vs rigid solar panels
Flexible panels are not a direct replacement for rigid panels — they serve different purposes. Here's how they compare:
| Factor | Flexible Panels | Rigid Panels |
|---|---|---|
| Weight | 1.5–3kg per panel | 18–22kg per panel |
| Thickness | 2–3mm | 35–40mm |
| Efficiency | 10–22% (varies by type) | 20–24% (monocrystalline) |
| Lifespan | 5–15 years | 25–30 years |
| Durability | Moderate — no glass, more susceptible to UV degradation | Excellent — tempered glass, aluminium frame |
| Installation | Adhesive, Velcro, or bolt-on — no racking needed | Requires mounting rails and brackets |
| Cost per watt | £1–£2/W | £0.50–£1/W (panel only) |
| Curved surfaces | Yes — can bend up to 30° | No — flat or angled surfaces only |
| Best for | Campervans, boats, curved roofs, lightweight structures | Standard rooftop systems, ground mounts |
For a standard home rooftop installation, rigid panels remain the better choice due to higher efficiency, longer warranties, and lower cost per watt. Flexible panels excel where weight, profile, or surface shape rules out rigid alternatives.
Types of flexible solar panels
Not all flexible panels use the same cell technology. The type you choose affects efficiency, cost, and lifespan.
Flexible Monocrystalline
Best all-round performance
These use the same monocrystalline silicon cells found in rigid panels, but sliced thinner and laminated onto a flexible backing. They offer the highest efficiency of any flexible panel (18–22%) and are the most popular choice for campervans and boats in the UK. Brands like Sunman and BougeRV use this technology.
Pros
- Highest efficiency (18–22%)
- Good power output per m²
- Widely available in the UK
Cons
- More expensive than thin-film
- Micro-cracks possible if over-flexed
- Slightly heavier than thin-film
CIGS (Copper Indium Gallium Selenide)
True flexibility and lightweight
CIGS panels use a thin semiconductor layer deposited on a flexible substrate. They are extremely thin and lightweight — some weigh under 1kg. Efficiency is lower (12–16%) but they perform better in partial shade and low light than monocrystalline. MiaSolé is a well-known CIGS manufacturer.
Pros
- Ultra-lightweight
- Better shade tolerance
- Truly flexible — can conform to tight curves
Cons
- Lower efficiency (12–16%)
- Less widely available
- Higher cost per watt
Amorphous Silicon (a-Si)
Budget option
Amorphous silicon is the oldest thin-film technology. The silicon is deposited in a very thin non-crystalline layer. These panels are cheap and flexible but have the lowest efficiency (6–10%). They degrade faster than other types and need more surface area to generate the same power.
Pros
- Cheapest flexible option
- Works well in diffuse light
- Very thin and light
Cons
- Low efficiency (6–10%)
- Needs much more surface area
- Faster degradation over time
CdTe (Cadmium Telluride)
Commercial thin-film applications
CdTe panels are primarily used in large-scale commercial solar farms (First Solar is the biggest manufacturer). While some flexible CdTe products exist, they are not widely available for residential or portable use in the UK. Efficiency is around 11–15%.
Pros
- Low manufacturing cost
- Reasonable efficiency (11–15%)
- Established technology
Cons
- Contains cadmium (toxic heavy metal)
- Rarely available in flexible format for consumers
- Primarily commercial-scale
Our recommendation: For most UK buyers, flexible monocrystalline panels offer the best balance of efficiency, availability, and price. Choose CIGS if you need maximum flexibility and minimum weight.
How much do flexible solar panels cost?
Flexible solar panels cost more per watt than rigid panels, but the total project cost can be lower because installation is simpler — no mounting rails, no scaffolding, and often a DIY job. Here are typical UK prices for 2026:
| Panel Size | Typical Cost | Cost per Watt | Best For |
|---|---|---|---|
| 50W | £40–£80 | £0.80–£1.60/W | Phone/laptop charging, small 12V systems |
| 100W | £70–£150 | £0.70–£1.50/W | Campervans, caravans, sheds |
| 200W | £130–£250 | £0.65–£1.25/W | Larger campervans, boats, garden offices |
| 300W | £200–£350 | £0.65–£1.15/W | Narrowboats, small rooftop systems |
| 400W+ | £280–£500 | £0.70–£1.25/W | Residential curved roofs, flat roofs on outbuildings |
Prices are for the panel only. VAT on domestic solar panels is 0% until March 2027. You will also need a charge controller, inverter (if connecting to mains), cabling, and potentially a battery — add £200–£800 depending on setup.
Campervan setup cost
A typical campervan solar setup with 200–400W of flexible panels, MPPT charge controller, 100Ah lithium battery, and wiring costs £500–£1,200 as a DIY project.
Boat setup cost
A narrowboat or yacht solar system with 300–600W of flexible panels, marine-grade controller, and installation typically costs £800–£2,000.
Curved roof installation
A professional installation of flexible panels on a curved or barrel roof can cost £3,000–£6,000 for a 2–4kW system, including inverter and connection to your consumer unit.
Best uses for flexible solar panels
Flexible panels are not intended to replace a standard rooftop installation. They shine in situations where rigid panels simply will not work:
Campervans & motorhomes
The most popular use in the UK. Flexible panels sit flush on the roof, adding virtually no height (important for ferries and car parks with height barriers). A 200–400W setup powers lights, a fridge, phone charging, and a water pump.
Boats & narrowboats
Lightweight panels that conform to a curved cabin top are ideal for boats. They resist wind uplift (no frame to catch the wind) and can handle the occasional splash. Marine-grade flexible panels have reinforced connectors for salt-water environments.
Curved & barrel roofs
Barrel-vault roofs, Quonset huts, and curved agricultural buildings cannot use rigid panels. Flexible panels glue directly to the curved surface, following the contour of the roof.
Sheds & outbuildings
Many sheds and outbuildings have roofs too weak for rigid panels. A 100–200W flexible panel weighing under 3kg can power LED lighting, a security camera, or charge power tools without reinforcing the roof structure.
Flat rubber (EPDM) roofs
Extensions and garages with EPDM rubber roofs are tricky for rigid panels because drilling mounting holes risks leaks. Flexible panels bond directly to the membrane using adhesive, avoiding any roof penetrations.
Portable & temporary setups
Festivals, camping trips, and emergency power. Lightweight flexible panels roll up or fold flat, making them easy to transport. Pair with a portable power station for off-grid electricity.
Pros and cons of flexible solar panels
Pros
- Ultra-lightweight — 1.5–3kg vs 18–22kg for rigid panels; no structural reinforcement needed
- Thin & low-profile — 2–3mm thick; sit almost flush with the mounting surface
- Bendable — conform to curved surfaces up to 30° arc
- Easy DIY installation — glue, Velcro, or bolt on; no racking or scaffolding
- No roof penetrations — adhesive mounting avoids drilling holes and risking leaks
- Low wind resistance — flat profile reduces wind uplift risk
- Portable — easy to remove, reposition, or take with you when you move
Cons
- Lower efficiency — 10–22% vs 20–24% for rigid monocrystalline panels
- Shorter lifespan — 5–15 years vs 25–30 years for rigid panels
- Faster degradation — polymer encapsulation degrades faster than tempered glass
- Heat build-up — panels bonded flat to a surface have no airflow underneath, which raises temperature and reduces output by 10–25%
- More expensive per watt — £1–£2/W vs £0.50–£1/W for rigid panels
- Shorter warranties — typically 5–10 years vs 25 years for rigid panels
- Not MCS-certified — most flexible panels are not MCS-listed, so you cannot claim Smart Export Guarantee payments
Heat build-up warning
When flexible panels are glued flat to a surface (e.g. a campervan roof or flat roof), there is no air gap underneath for cooling. On hot days, panel temperature can reach 70–80°C, reducing output by 10–25%. Where possible, use standoff mounts to create a small air gap — even 10–20mm helps significantly.
How long do flexible solar panels last?
This is the biggest drawback of flexible solar panels. While rigid panels routinely last 25–30 years with minimal degradation (losing roughly 0.3–0.5% output per year), flexible panels have a much shorter useful life:
| Panel Type | Expected Lifespan | Annual Degradation | Typical Warranty |
|---|---|---|---|
| Flexible monocrystalline | 10–15 years | 1–3% per year | 5–10 years |
| CIGS thin-film | 10–15 years | 1–2% per year | 5–10 years |
| Amorphous silicon | 5–10 years | 2–4% per year | 2–5 years |
| Rigid monocrystalline (for comparison) | 25–30 years | 0.3–0.5% per year | 25 years |
The main reasons flexible panels degrade faster are:
- UV degradation of the polymer encapsulant — ETFE and PET films break down faster than tempered glass under UV exposure
- No rigid frame for protection — flexible panels are more prone to micro-cracks from handling, thermal cycling, and wind vibration
- Moisture ingress — polymer layers are less effective moisture barriers than glass, leading to cell corrosion over time
- Higher operating temperatures — without an air gap, panels run hotter, accelerating degradation
For a campervan or boat where panels may only be needed for 5–10 years, this lifespan is perfectly adequate. For a permanent home installation, the shorter lifespan and need for replacement make rigid panels a far better long-term investment unless your roof physically cannot support them.
Frequently Asked Questions About Flexible Solar Panels
Are flexible solar panels any good?
Yes, for the right application. Flexible solar panels are excellent for campervans, boats, curved roofs, and lightweight structures where rigid panels cannot be used. They are less efficient and shorter-lived than rigid panels, so they are not ideal for a standard home rooftop system. For their intended use cases, they are a proven and reliable technology.
How much do flexible solar panels cost in the UK?
Flexible solar panels cost £100–£300 per panel in 2026, or roughly £1–£2 per watt. A 100W panel typically costs £70–£150, a 200W panel £130–£250, and a 300W+ panel £200–£350. VAT on domestic solar panels is currently 0%. You will also need a charge controller, cabling, and potentially a battery and inverter.
Can I use flexible solar panels on my house?
You can, but in most cases rigid panels are the better choice for a home. Flexible panels make sense for houses with curved roofs, lightweight structures (e.g. conservatory roofs), or EPDM flat roofs where drilling mounting holes is not advisable. Be aware that most flexible panels are not MCS-certified, which means you will not be eligible for the Smart Export Guarantee.
How long do flexible solar panels last?
Flexible solar panels typically last 5–15 years, depending on the technology and conditions. Flexible monocrystalline and CIGS panels last 10–15 years, while cheaper amorphous silicon panels may only last 5–10 years. This compares to 25–30 years for rigid panels. Degradation is faster due to UV exposure, heat build-up, and moisture ingress through the polymer encapsulation.
Can I walk on flexible solar panels?
Some flexible panels are marketed as 'walkable' and can tolerate occasional foot traffic — this is common on boat decks. However, walking on panels regularly will cause micro-cracks in the cells, reducing output over time. Avoid walking on them if possible, and never step on the junction box or cable connections.
Do flexible solar panels work in the UK climate?
Yes. Flexible solar panels work in exactly the same way as rigid panels — they generate electricity from light, not heat. UK solar irradiance is sufficient to make them worthwhile, especially for off-grid applications. In fact, flexible panels with thin-film cells (CIGS, amorphous silicon) can perform slightly better in overcast, diffuse-light conditions compared to crystalline panels.
Can I connect flexible solar panels to the grid?
Technically yes, with a grid-tie inverter. However, most flexible panels are not MCS-certified, so you will not receive MCS certification for the installation. This means you cannot register for the Smart Export Guarantee to be paid for exported electricity. For grid-connected systems, rigid panels are almost always the better option.
What is the best flexible solar panel for a campervan?
For a UK campervan, we recommend flexible monocrystalline panels in the 100–200W range. Popular brands include Renogy, BougeRV, and Eco-Worthy. Look for ETFE coating (more durable than PET), bypass diodes for shade tolerance, and an efficiency rating above 20%. A 200W panel paired with an MPPT charge controller and a 100Ah lithium battery is a solid starting point for most campervan builds.
Related Guides
Solar Panel Types
Monocrystalline, polycrystalline, thin film, bifacial, and IBC panels compared.
Portable Solar Panels
Portable solar for camping, campervans, and caravans: types, sizing, and top picks.
Best Solar Panels
Top 5 solar panel systems ranked for UK homes.
Solar Panel Costs
Full cost breakdown and payback periods.
Sources
- Energy Saving Trust — Solar Panels — energysavingtrust.org.uk
- MCS — Find a Certified Installer — mcscertified.com
- Ofgem — Smart Export Guarantee — ofgem.gov.uk
- NREL — Thin-Film Solar Cell Technologies — nrel.gov
Last updated: April 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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