The JA Solar JAM54D-40-455-LB-TSLC-MC4 is a 455W N-type bifacial solar panel from JA Solar's DeepBlue 4.0 Pro range, built around half-cut, multi-busbar N-type TOPCon cells housed in a double-glass, black-framed module. Rated at up to 22.8% module efficiency, it is designed to squeeze more usable energy out of every roof panel position, whether for a compact domestic array or a larger commercial installation.
Its bifacial construction lets the rear glass surface capture reflected light as well, adding extra yield from light-coloured roofing, gravel, or ground-mounted reflective surfaces without any extra wiring or controls. Combined with N-type cell technology, which brings markedly lower light-induced degradation than older P-type panels, this module is built for strong output that holds up well over a long service life.
30 yrs
Linear Performance Warranty
Please Note: This is the TSLC (Traceable, Low Carbon) variant of the JAM54D40-455/LB platform. JA Solar also sells closely related SKUs on the same 430–455W platform (LB and LB/1500V, TSLC and non-TSLC, black-frame and full-black options) — always check the exact model code and SKU before ordering, as electrical output and frame finish can differ between them.
Key Features
N-Type TOPCon Cells
Uses 108 half-cut, multi-busbar N-type cells for improved carrier passivation, giving lower first-year and annual degradation than standard P-type modules.
Bifacial Double-Glass Design
A glass-glass construction allows the rear face to harvest reflected light, boosting total energy yield on suitable surfaces while adding extra rigidity and long-term weather resistance.
High Module Efficiency
Delivers up to 22.8% efficiency, so more power is generated from the same roof area — useful where available mounting space is limited.
Strong Mechanical Load Ratings
Rated to withstand 2400 Pa front (snow) load and 1600 Pa rear load, suiting installations exposed to UK wind and snow conditions.
Low Temperature Coefficient
A Pmax temperature coefficient of -0.3%/°C means output falls off more slowly as panel temperature rises, helping maintain performance on warm days.
Stäubli MC4-Compatible Connectors
Terminates in Stäubli MC4-EVO2 connectors with 1200 mm cable leads for a secure, weatherproof connection and straightforward first-fix wiring.
Technical Specifications
| Electrical Performance (STC) |
| Model Number |
JAM54D-40-455-LB-TSLC-MC4 |
| Rated Power (Pmax) |
455 W |
| Maximum Power Voltage (Vmpp) |
33 V |
| Maximum Power Current (Impp) |
13.79 A |
| Open Circuit Voltage (Voc) |
39.5 V |
| Short Circuit Current (Isc) |
14.56 A |
| Module Efficiency |
Up to 22.8% |
| Power Tolerance |
0 / +3% (measurement tolerance at STC) |
| Cell & Construction |
| Cell Type |
N-type TOPCon, half-cut, multi-busbar (16BB) |
| Number of Cells |
108 (54 full cells, half-cut) |
| Cell Size |
182 mm |
| Construction |
Bifacial, double glass (glass-glass) |
| Frame Colour |
Black anodised aluminium |
| Fire Safety Class |
Class C |
| Mechanical Data |
| Dimensions (L x W x H) |
1762 x 1134 x 30 mm |
| Weight |
22.5 kg |
| Front / Rear Load Rating |
2400 Pa / 1600 Pa |
| Connector |
Stäubli MC4-EVO2 |
| Cable Length |
1200 mm (+) / 1200 mm (-) |
| Maximum System Voltage |
1500 V DC |
| Temperature Coefficients |
| Temperature Coefficient of Pmax |
-0.3%/°C |
| Operating Temperature Range |
-40°C to +85°C |
| Warranty |
| Product Warranty |
25 years |
| Linear Performance Warranty |
30 years (1% first-year degradation, max 0.4% annually thereafter) |
Power Class Variants — Same JAM54D40 LB Platform
| Model |
Pmax |
Vmpp |
Impp |
Voc |
Isc |
| JAM54D-40-430-LB-TSLC-MC4 |
430 W |
31.2 V |
13.79 A |
37.6 V |
14.56 A |
| JAM54D-40-435-LB-TSLC-MC4 |
435 W |
31.6 V |
13.77 A |
37.9 V |
14.56 A |
| JAM54D-40-440-LB-TSLC-MC4 |
440 W |
32.0 V |
13.75 A |
38.3 V |
14.56 A |
| JAM54D-40-445-LB-TSLC-MC4 |
445 W |
32.4 V |
13.73 A |
38.7 V |
14.56 A |
| JAM54D-40-450-LB-TSLC-MC4 |
450 W |
32.7 V |
13.76 A |
39.1 V |
14.56 A |
| JAM54D-40-455-LB-TSLC-MC4 |
455 W |
33.0 V |
13.79 A |
39.5 V |
14.56 A |
Important: This module must be installed by a qualified MCS-certified solar installer in line with UK wiring regulations and manufacturer installation instructions. Correct string sizing, earthing, and isolation are essential for safe operation.
Frequently Asked Questions
What does N-type bifacial mean for this panel?
N-type refers to the semiconductor doping used in the solar cells, which typically gives lower degradation rates over the panel's life compared with older P-type cells. Bifacial means the rear side of the panel can also generate power from light reflected onto it, adding extra yield depending on the mounting surface and tilt.
Will I get the full benefit of the bifacial rear side on a normal pitched roof?
Bifacial gain is highest on elevated, ground-mounted, or flat-roof installations over light-coloured or reflective surfaces. On a close-fitted pitched roof with little airflow or reflection behind the panel, the bifacial contribution will be smaller, though the panel still performs as a standard high-efficiency front-side module.
What connector type does this panel use?
It is fitted with Stäubli MC4-EVO2 connectors on 1200 mm cable leads, which are compatible with the widely used MC4 connector standard for solar installations.
What warranty applies to this panel?
JA Solar backs this module with a 25-year product warranty and a 30-year linear performance warranty, guaranteeing no more than 1% power degradation in the first year and a maximum of 0.4% per year after that.
Can this panel be used in a 1500V system?
Yes. The module is rated for a maximum system voltage of 1500V DC, making it suitable for both standard 1000V and higher-voltage 1500V string designs subject to inverter and system design compatibility.
