Bifacial Solar Panels in Ireland
Bifacial solar panels generate electricity from both faces: the front captures direct sunlight as normal, and the rear picks up reflected light (albedo) from the roof, ground, or surrounding surfaces. Depending on the install, this adds 2 to 30% extra output for a 5 to 15% price premium.
Quick Answer
Bifacial solar panels generate electricity from both sides. The front works like a normal panel, while the rear captures reflected light from the roof, ground, or surrounding surfaces. They add 2 to 30% output depending on install (2 to 5% on standard pitched roofs with dark tiles, 8 to 12% on typical ground mounts, 15 to 30% on light reflective surfaces with elevation) for a 5 to 15% price premium. Many Tier 1 panels sold in Ireland (Jinko Tiger Neo, JA DeepBlue 4.0, Trina Vertex S+) are already bifacial by design.
How do bifacial solar panels work?
A standard (monofacial) solar panel has an opaque white or black backsheet that blocks light from reaching the rear of the cell. A bifacial panel replaces that backsheet with a transparent layer (glass or clear polymer), exposing the rear of the cell to any light that reaches it.
The rear face only generates power when light hits it, which happens via the albedo effect: light bouncing off the surface beneath and around the panel. The brighter and more reflective the surface, the more energy the rear side captures.
Albedo by surface type
- Fresh snow: 80 to 90% reflectivity (highest)
- White roof membrane: 60 to 80%
- Light gravel or concrete: 25 to 35%
- Dry grass: 15 to 25%
- Dark asphalt or slate roof: 10 to 15% (lowest)
Source: NREL bifacial gain field data
How much extra output do bifacial panels produce?
The output gain depends entirely on the install. The same panel can deliver 5% extra on one roof and 25% extra on another. Here is what to expect by mounting setup:
| Install type | Typical bifacial gain | Why |
|---|---|---|
| Pitched roof, dark slate or tile | 2 to 5% | Low albedo, panel close to roof surface |
| Pitched roof, light tile or trapezoidal metal | 5 to 10% | Higher albedo, similar geometry |
| Flat roof, white membrane, raised mount | 10 to 20% | High albedo, gap between panel and roof |
| Ground mount, typical (grass, dark gravel) | 8 to 12% | Mid albedo, real-world stable yield |
| Ground mount, light gravel or concrete, 1m elevated | 15 to 30% | High albedo plus elevation gap |
| Carport / canopy over light surface | 20 to 30% | Best-case geometry and albedo |
| Vertical (east-west bifacial) | 10 to 25% | Both faces collect direct light at different times |
Indicative gain vs equivalent monofacial panel under the same irradiance. Real-world results depend on row spacing, tilt angle, soiling, and seasonal albedo.
How much do bifacial solar panels cost in Ireland?
Bifacial panels carry a 5 to 15% premium over equivalent monofacial panels at the panel level. At the system level the premium is smaller (3 to 8%) because mounting, inverter, labour, and grant value are unchanged.
| System | Monofacial cost | Bifacial cost | Cost premium |
|---|---|---|---|
| 3 kWp (8 panels) | €7,200 to €8,500 | €7,400 to €8,900 | 3 to 5% |
| 4 kWp (10 panels) | €8,500 to €10,500 | €8,800 to €11,000 | 3 to 5% |
| 6 kWp (14 panels) | €10,500 to €13,000 | €10,900 to €13,700 | 4 to 6% |
SEAI grants apply equally to bifacial and monofacial panels, and the 0% VAT rate also applies. See the full solar panel cost breakdown for installed pricing by system size.
Indicative supplied-and-installed pricing in Ireland in 2026. Actual quotes vary by installer, panel brand, and roof complexity.
Are bifacial solar panels worth it in Ireland?
Bifacial is worth it when the install can deliver double-digit rear-side gain. On a standard pitched roof with dark tiles, the gain is modest and the payback on the premium is long. On ground mounts, flat roofs, or carports it pays back fast.
Worth it
- Ground-mounted systems on light surfaces. See ground-mounted solar panels.
- Flat roofs with white membrane on raised mounts.
- Carports and canopies over light gravel or concrete.
- Farm and commercial sites with concrete or gravel surrounds.
Not worth the premium
- Standard pitched roofs with dark tile or slate.
- In-roof installs where the panel sits flush against the roof tray.
- Heavily shaded sites where the rear receives little reflected light.
On these installs you may already be getting a bifacial panel without paying extra, since most Tier 1 panels are bifacial by design.
Bifacial solar panel brands available in Ireland
All major Tier 1 manufacturers now ship bifacial variants of their flagship products. Many are bifacial by default. If your installer quotes one of these brands, ask whether the specific SKU is bifacial and whether your mount allows the rear side to capture reflected light.
Jinko Solar Tiger Neo N-type
Bifacial by default in current 440W product. Output gain rated up to 25% on optimal installs.
Read full review →JA Solar DeepBlue 4.0 N-type
Bifacial on flagship 440W. Glass-glass construction, 30-year performance warranty.
Read full review →Trina Vertex S+ N-type
Bifacial 440 to 445W. Strong low-light performance suits Irish climate.
Read full review →Aiko Neostar 2S ABC
ABC back-contact panel, bifacial variant available. Highest residential efficiency.
Read full review →Frequently Asked Questions About Bifacial Solar Panels
What are bifacial solar panels?
Bifacial solar panels generate electricity from both faces. The front captures direct sunlight as a standard panel does, while the rear captures reflected light (albedo) from the roof, ground, or surrounding surfaces. They use a transparent backsheet or glass-glass construction instead of an opaque white backsheet.
How much more do bifacial panels produce?
The bifacial gain ranges from 2 to 30% depending on the install. On standard pitched roofs with dark tiles, expect 2 to 5% (NREL field data). Typical ground mounts on grass or dark gravel see 8 to 12%. Ground mounts on light gravel or concrete with 1m elevation can reach 15 to 30%. Carports over reflective surfaces deliver the highest gains.
Are bifacial solar panels worth it in Ireland?
Yes for ground-mounted systems, flat roofs with white membrane, carports, and farm or commercial sites with reflective ground. Less so for standard pitched roofs with dark tiles, where the gain is modest and the panel sits close to a low-albedo surface.
Do bifacial panels qualify for the SEAI grant?
Yes. The SEAI Solar Electricity Grant applies to all eligible solar PV panels installed by an SEAI-registered contractor, regardless of whether the panel is bifacial or monofacial. The 0% VAT rate also applies.
How much do bifacial solar panels cost in Ireland?
At the panel level, bifacial costs 5 to 15% more than the equivalent monofacial panel. At the system level the premium is smaller, typically 3 to 8%, because mounting, inverter, labour, and grant value are unchanged.
Can bifacial panels be installed on any roof?
Yes, but the rear-side gain depends on what is beneath the panel. On dark slate or tile roofs the gain is small (5 to 8%). For best results, bifacial panels are mounted on light or reflective surfaces with at least a 5 to 10 cm gap between panel and surface.
Is glass-glass the same as bifacial?
Not always, but they often go together. Glass-glass panels have glass on both faces (front and rear) and are usually bifacial. Some bifacial panels use a transparent polymer backsheet instead of rear glass. Glass-glass adds durability and longer warranties (often 30 years performance) at higher weight.
Do bifacial panels last longer than monofacial?
Glass-glass bifacial panels typically carry a 30-year performance warranty vs 25 years for standard monofacial panels, and have lower annual degradation rates. The cells themselves are the same monocrystalline silicon, so lifespan is comparable. The longer warranty reflects better mechanical durability.
Related Guides
Panel Types
Mono, poly, bifacial, TOPCon, HJT, IBC and more compared.
Solar Panel Efficiency
2026 efficiency ratings by cell type and brand, plus what efficiency means in practice.
Panel Brands
Best solar panel brands available in Ireland.
Ground Mounted Solar Panels
Costs, planning permission, pros & cons vs roof-mounted, and space requirements.
Sources
- NREL: Bifacial PV systems performance, nrel.gov
- SEAI: Solar Electricity Grant, seai.ie
- Jinko Solar: Tiger Neo bifacial datasheet, jinkosolar.com
Last updated: May 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.
Get a Quote for Bifacial Solar Panels
Get free quotes from SEAI-registered installers. They will tell you whether bifacial is worth the premium for your specific roof or site.