Solar panel types
Not all solar panels are the same. The technology you choose will affect the efficiency, appearance, and cost of your system. There are three main types of solar photovoltaic (PV) panels used in the UK.
1. Monocrystalline panels
These are made from a single, pure crystal of silicon. They are easily recognisable by their dark, uniform colour and rounded edges.
- Best for: Most residential roofs where space is limited.
- Efficiency: Highest (typically 17% to 22%).
- Pros: Most efficient, perform better in lower light conditions, and have a sleek, premium appearance.
- Cons: Most expensive to manufacture and purchase.
2. Polycrystalline panels
Also known as multicrystalline, these are made by melting multiple silicon crystals together. They have a blue, speckled appearance.
- Best for: Large installations or budgets where maximum efficiency isn’t the primary concern.
- Efficiency: Medium (typically 13% to 17%).
- Pros: Cheaper than monocrystalline panels, simpler manufacturing process.
- Cons: Lower efficiency means you need more roof space to generate the same amount of power. Performance drops more in high temperatures.
3. Thin-film panels
These are made by depositing one or more layers of photovoltaic material onto a substrate like glass, plastic, or metal.
- Best for: Curved surfaces, portable applications, or large-scale commercial roofs.
- Efficiency: Lowest (typically 10% to 13%).
- Pros: Lightweight, flexible, and least affected by high temperatures or shading.
- Cons: Require a lot of space due to low efficiency. Generally have a shorter lifespan than crystalline panels.
Comparison at a glance
| Feature | Monocrystalline | Polycrystalline | Thin-film |
|---|---|---|---|
| Efficiency | Highest | Medium | Lowest |
| Cost | Highest | Medium | Lowest |
| Space Required | Least | Medium | Most |
| Appearance | Black/Dark Grey | Blue Speckled | Uniform Black/Grey |
| Durability | High | High | Low/Medium |
Other solar technologies
Solar Tiles (Solar Roof)
Instead of mounting panels on top of your existing roof, solar tiles are the roof. They are designed to look like traditional slate or clay tiles.
- Pros: Aesthetic appeal, perfect for new builds or heritage properties.
- Cons: Very expensive and less efficient than standard panels.
Bifacial Panels
These panels can capture sunlight on both the front and the back.
- Best for: Ground-mounted systems where light can reflect off the ground onto the rear of the panel.
Recommendation: For the vast majority of UK homes, Monocrystalline panels are the best choice as they offer the highest energy yield from the limited roof space available.