It also produces with its back, from the light reflected by the ground: 590 Wp on the front, 80% bifaciality and 22.84% efficiency, in a double-glass construction.
Ulica UL-590M-144ADGN is a bifacial panel, that is one that produces electricity not only with its face towards the sun, but also with its back, from the light reflected off the ground. Instead of the usual backsheet, it has a second sheet of glass, transparent, which lets the reflected light reach the cells. The gain appears where the surface under the panel is light coloured - white roof membrane, light gravel, snow - and is small or non-existent if the panel sits flat against a dark coloured roof.
On the front, the module gives 590 Wp at standard test, on a surface of 2.58 m2, at an efficiency of 22.84%. The bifaciality factor is 80%, that is the rear face can produce, in good reflection conditions, up to 80% of what the main face produces; in practice, the real gain depends on how light the surface underneath is and on how high the panel is raised. It weighs 30.6 kg and measures 2278 x 1134 x 30 mm, so it is mounted by two people and requires an appropriately dimensioned structure. The construction of two sheets of glass in an aluminium frame stands up well to moisture and to mechanical stress, and the warranty is 15 years on the product and 30 years linear on power, with 0.40% degradation per year, that is about 87.4% of the power at 30 years.
At STC (main face): Pmax 590 Wp, Vmp 44.35 V, Imp 13.30 A, Voc 52.82 V, Isc 14.02 A, efficiency 22.84% on 2.58 m2. Bifacial N-type TOPCon cells, 144 half-cells, double-glass construction with an aluminium frame, bifaciality 80%, NOCT 43 °C. Maximum system voltage 1500 V DC, which allows long strings. Temperature coefficients: -0.29 %/°C (Pmax), -0.25 %/°C (Voc), +0.046 %/°C (Isc); when dimensioning the inverter the additional current generated by the rear face is taken into account. Footprint 2278 x 1134 x 30 mm, 30.6 kg.
Suitable for ground installations, carports or flat roofs with a reflective membrane, where there is space under the panel and a light coloured surface for the rear face to have something to capture; on pitched roofs, mounted flat against the tiles, the bifacial advantage is lost.
| Rated power (STC, front) | 590 Wp |
|---|---|
| Module efficiency | 22,84% |
| Vmp / Imp | 44,35 V / 13,30 A |
| Voc / Isc | 52,82 V / 14,02 A |
| Cell technology | N-type TOPCon bifacial, 144 semi-celule |
| Construction | dublu-sticla (double glass), cadru de aluminiu |
| Bifaciality | 80% |
| Dimensions | 2278 x 1134 x 30 mm |
| Weight | 30,6 kg |
| Maximum system voltage | 1500 V DC |
| Pmax temperature coefficient | -0,29 %/grad C |
| Voc temperature coefficient | -0,25 %/grad C |
| Isc temperature coefficient | +0,046 %/grad C |
| NOCT | 43 grade C |
15 years product warranty and 30 years linear power warranty; degradation 0.40%/year, about 87.4% at 30 years
Series-level specifications — valid for the product family
UL-590M-144ADGN is a double-glass bifacial module from the Ulica Solar 580-595 W series, built on N-type TOPCon cells cut in half and arranged in 144 half-cells. The ADGN suffix indicates the N-type version with double glass, which allows diffuse and reflected light to be captured on the rear face as well.
At STC the module delivers 590 Wp on the front, with Vmp 44.35 V, Imp 13.30 A, Voc 52.82 V and Isc 14.02 A, at an efficiency of 22.84% on 2.58 m2. The bifaciality factor is 80%, so in favourable albedo conditions (white roof, light gravel, snow) the total output increases significantly compared with an equivalent monofacial module. The temperature coefficients are -0.29 %/degree C for Pmax, -0.25 %/degree C for Voc and +0.046 %/degree C for Isc, and the NOCT is 43 degrees C.
The double-glass structure in an aluminium frame offers good resistance to humidity, to PID and to mechanical stress, and the maximum system voltage of 1500 V allows long strings. The format of 2278 x 1134 x 30 mm and the weight of 30.6 kg place it in the class of modules for commercial and utility projects, where it is mounted by two operators.
More energy from the same roof area: 600 W from a single module, at 23.2% efficiency, with the contacts moved to the back for a fully active front face.
Fewer parts and faster installation for the same power: 615 W per module, at 23.8% efficiency, in a panel of 27 kg and 2278x1134x30 mm.
455 W and 22.8% efficiency in a 21.5 kg panel, with cells without metal contacts on the front and low losses in heat.
The front of the panel has no metal stripes: 450 W, 22,6% efficiency and only 21,5 kg, with good behaviour under partial shading.
