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Bifacial PV in Ground Mount: Extra Production with Terrasol

24 Jul 2026 Axinar A.E. 2 min read

Bifacial PV panels produce energy from both sides, front from direct sunlight and back from ground reflection. In the right setup, this translates to 10–25% extra annual production without extra space. In the wrong setup, the difference is negligible. What’s critical is HOW they’re installed, not just buying a bifacial panel.

How Bifacial Panels Work

A common monofacial panel has an opaque backsheet. The bifacial has a transparent back surface (glass or polymer) and photovoltaic cells that work on both sides. The front side produces the bulk of energy (~90% of total). The back side adds extra 10–25%, depending on conditions.

Bifacial Gain Factors

1. Ground Reflectivity (Albedo)

Ground Type	Albedo	Bifacial Gain
Fresh snow	0.70–0.90	25–30%
White gravel / granite	0.40–0.60	15–22%
Sand / light ground	0.25–0.40	10–15%
Grass	0.15–0.25	6–10%
Asphalt / dark	0.05–0.15	3–6%

2. Height Above Ground

The greater the height, the more reflection reaches both sides. Ideal height: 0.8–1.5m from ground for ground mount, or above roofs with ballast (~30–50cm).

3. Tilt Angle

A lower tilt (15–25°) allows more reflected radiation to reach the back side. Matches East-West and ground mount systems.

4. No Shading from Structural Elements

Beams, piles and rails must be as far back and thin as possible, so as not to shade the back side.

Ideal Installations for Bifacial

Ground mount (Terrasol): Height from ground, clean bottom side, bifacial gain 10–20%
East-West agri-PV: Low tilt, uniform reflection, bifacial gain 15–25%
Solar Carport: Canopies with bright surface below (concrete, asphalt), bifacial gain 5–10% (AXINAR uses Bifacial PERC panels on Solar Carport)
Roof with ballast: Height from membrane, bright surface, bifacial gain 8–12%

Not Ideal (Bifacial NOT worth it)

Tile roof: Panel is stuck to tiles, zero back reflection. Use plain monofacial.
Dark roofs: Black tiles, dark asphalt, bifacial gain < 3%. Extra cost not justified.
Dense arrangements without height: If back sides shadow each other.

Cost & Payback

Bifacial panels typically cost 5–15% more than same monofacial. In a properly designed ground mount installation with 15% bifacial gain, the extra investment payback happens within 1–2 years. In the remaining 23+ years of operation, the extra 15% is net gain.

AXINAR Terrasol 2V

Ground mount / roof, bifacial compatible

Terrasol 2V is installed at height from the roof, giving space for reflective radiation on the back side of bifacial panels, 8–12% bifacial gain in typical conditions.

Compact 2-rows, maximizes reflective surface
Adjustable angle 10–35°
Galvanized Greek manufacture

See the product →

Request a Static Study & Quote

Send us your project basics, square meters, roof or ground type, zone, PV capacity, and we’ll respond within 24 hours with a recommended mounting system and free static study.

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See optimal tilt angle, or East-West agri-PV where bifacial is fully utilized.