There are four main types of solar panels: rigid (the most efficient and durable, best for permanent installations), flexible (thin and lightweight, suited to curved surfaces), rollable (ultra-portable and compact), and portable folding panels (ideal for camping and off-grid use). The right choice depends on where and how you plan to mount them.
Choosing a solar panel is not simply a matter of picking the highest wattage. The physical format of a panel determines where it can be mounted, how durable it will be, and how convenient it is to use. Here is a clear breakdown of each type.
Rigid Solar Panels
Rigid panels are the traditional format: a glass-fronted aluminium-framed module, typically monocrystalline. They are the most widely available format and, watt-for-watt, the most affordable.
Best for
- Fixed roof installations (van roofs, cabins, boat decks, garden structures)
- Ground-mounted arrays
- Any situation where weight and profile are not a constraint
Efficiency and durability
Modern monocrystalline rigid panels achieve 20-23% efficiency. The tempered glass surface is highly resistant to hail, UV, and general weathering. A quality rigid panel should last 25 years or more.
Limitations
They cannot flex, so they require a flat or near-flat mounting surface. They are also heavier, typically 8-12kg for a 200W panel, which can be a concern for lightweight van builds or weight-restricted rooftops.
Flexible Solar Panels
Flexible panels use thin-film or monocrystalline cells bonded to a flexible backing material rather than glass. They can bend up to around 30 degrees, which opens up curved and irregular mounting surfaces.
Best for
- Curved caravan or motorhome roofs
- Boat hulls and coach roofs
- Situations where a low-profile, lightweight panel is needed
Efficiency and durability
Flexible panels are slightly less efficient than their rigid counterparts, typically 18-20%. They are also more susceptible to delamination and heat-related degradation if mounted flush to a surface with no airflow underneath. Expect a shorter lifespan of 10-15 years compared to rigid panels.
Limitations
Do not bend them beyond their rated flex radius, and avoid mounting them directly on hot metal surfaces without some form of ventilation or standoff.
Rollable Solar Panels
Rollable panels are a relatively new category. They use ultra-thin, lightweight cells that can be rolled up like a mat for storage and transport. EcoFlow's 400W Rollable Solar Panel is a good example of the category.
Best for
- Overlanding and expedition use where storage space is limited
- Supplementing a fixed panel array when extra power is needed temporarily
- Users who need a high-wattage portable option
Efficiency and durability
Efficiency is competitive with rigid panels in some designs, particularly those using monocrystalline cells. However, they are generally more expensive per watt than rigid equivalents.
Portable Folding Solar Panels
Folding panels consist of two or more rigid or semi-rigid panels connected by hinges, folding down to a compact suitcase-style form factor. They usually include integrated stands and MC4 or proprietary connectors.
Best for
- Camping and festivals
- Charging portable power stations
- Any situation where the panel needs to be set up and packed away daily
What to look for
Check the output connector type: some folding panels use MC4 connectors, others use proprietary plugs that only work with specific power stations. EcoFlow's folding panels integrate directly with their DELTA and RIVER series via a matching connector and include MPPT optimisation.
Also check the open-circuit voltage (Voc) against the maximum solar input voltage of your power station or charge controller. Connecting a panel with too high a Voc will damage the charge controller.
Which Type Should You Buy?
For a permanent van or cabin installation, rigid panels deliver the best value and longevity. For a curved surface, flexible panels are the practical choice. For camping or day trips, folding portable panels are hard to beat for convenience. Rollable panels suit those who need high wattage in a compact stored form.
In most cases, you will get the best results pairing any of these panel types with a quality MPPT charge controller and a correctly sized battery bank.
