Efficiency leader, weak in heat
The Just Solar JST-FCMH-(710-740)W-HD series is designed for maximum energy yield on a large surface area - without compromising on durability and predictable performance. The modules utilize monocrystalline cells in a modern half-cut configuration, which helps to minimize resistive losses and improve stability under partial shading. This translates to higher production in real-world conditions and a reduced risk of performance degradation when the installation is exposed to variable sunlight.
In comparison to the competition, these modules stand out due to their combination of a high-efficiency module with a reasonable temperature coefficient, which makes it easier to maintain good performance in the summer. The tempered glass with anti-reflective coating supports light absorption and mechanical strength, while the high IP rating of the junction box increases safety in harsh external conditions. An additional advantage is the long warranty, which is important for investors who are concerned about the total cost of energy over the lifetime of the installation.
This is a good choice for PV farms, roof-mounted systems, and commercial projects where power density, stability, and ease of KPI management are important.
Ranking
Signals from the data
Utility-scale, commercial, shaded-installations and hot-climate.
Hot climates.
Top 2% of the HJT 700-750 W segment, against a median of 23.02%. Ranked 418th in the whole database.
Top 4% of the HJT 700-750 W segment, against a median of 230.2. Ranked 431st in the whole database.
Top 10% of the HJT 700-750 W segment, against a median of 53.6. Ranked 5,125th in the whole database.
Bottom 18% of the HJT 700-750 W segment, against a median of -0.240.
HJT technology achieves a Pmax temperature coefficient of approx. -0.24 to -0.26%/°C, compared to approx. -0.29 to -0.32%/°C for TOPCon (e.g., JA Solar JAM66D46 LB) and -0.34 to -0.38%/°C for PERC. At a typical summer module temperature of 65°C, this translates to a real-world yield advantage of 2–4% over PERC and 0.5–1.5% over TOPCon, a meaningful difference for utility-scale PV farms and industrial rooftops during peak season.
The 740 W variant reaches a module efficiency of 23.82%, matching direct peer comparables: Sharp GSD8K66H (23.82%) and JA Solar JAM66D46 LB (23.8%). High power density reduces BoS costs (cabling, racking, roof area) and simplifies KPI closure on area-constrained commercial projects.
The module is bifacial, delivering a typical bifacial gain of 5–15% in ground-mount installations with bright albedo surfaces (0.2–0.4). Combined with the high front-side efficiency, it achieves among the highest energy yields per square meter in the commercially available 710–740 W module class.
HJT technology exhibits an annual degradation rate of approx. 0.25–0.30%/yr versus ~0.40%/yr declared by JA Solar for TOPCon (JAM66D46 LB series guarantees min. 87.4% after 30 years). The ~0.10–0.15 pp/yr difference compounds over a 30-year asset life to 3–4% more cumulative energy production, directly lowering the project LCOE.
The manufacturer provides a 15-year product warranty (materials and workmanship), while direct peer competitor JA Solar offers 12 years as standard for the JAM66D46 LB series. The longer coverage reduces project risk and may simplify project financing without requiring additional performance insurance riders.
Just Solar does not appear on BNEF Tier-1 module manufacturer lists (Q1 2026 or earlier), whereas direct peer competitor JA Solar holds Tier-1 status and offers equivalent efficiency (23.8%) and power output (up to 740 W) in the JAM66D46 LB series. The absence of bankability certification is a real barrier on projects financed by commercial banks, which routinely require Tier-1 modules, potentially necessitating additional performance bonds or disqualifying the product from competitive tenders.
HJT manufacturing requires more expensive processes (PECVD deposition, silver paste loading 25–35% higher than TOPCon, CAPEX approx. 50% higher per GW of capacity). This results in a price premium: 2025–2026 FOB prices are approx. $0.100/W for HJT versus approx. $0.087/W for comparable-efficiency TOPCon — a 12–18% gap. On bulk purchases of 1 MWp and above, the additional cost of approx. $13,000/MWp can negatively impact project LCOE if the efficiency and temperature coefficient premium is not fully captured (e.g., installations in temperate climates without sustained high ambient temperatures).
- At 23.8% efficiency, this panel is 0.8pp above typical HJT 700-750W modules (median: 23.0%)
- 238.2 W/m² power density - 8.0 W/m² more than HJT 700-750W median (230.2 W/m²), more power per roof area
- At -0.26%/°C, loses 0.02pp more power per degree than HJT 700-750W median (-0.24%/°C)
- Bifaciality factor of 85% can add 4-13% extra yield with reflective mounting surface
- In the top 3% for efficiency among all HJT panels
Specifications
Datasheet charts
Measured curves published by Just Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 740 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
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