--- title: "Just Solar JST-FCMH-720W-HD 720W Solar Panel - Specs & Review | ComparePV" description: "Just Solar JST-FCMH-720W-HD 720W solar panel. Specs: 23.18% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/just-solar-jst-fcmh-720w-hd" updated: 2026-09-11 --- # Just Solar JST-FCMH-720W-HD Middle of its segment, weak in heat 222 panels in the segment HJT 700-750 W ## Identity - **Manufacturer:** Just Solar - **Model:** JST-FCMH-720W-HD - **Series:** JST-FCMH-(710-740)W-HD - **Rated power:** 720 W - **Cell technology:** HJT - **Bifacial:** yes ## How it compares Compared against segment HJT 700-750 W (222 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 720 W | 715 W | Typical | | | Module efficiency | 23.18% | 23.02% | Typical | 1,424 | | Power density | 231.8 | 230.2 | Typical | 1,347 | | Temperature coefficient | -0.260 | -0.240 | Weak - bottom 18% | 511 | | Weight (kg) | 38.3 kg | 38.3 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.18% | 23.02% | Typical | 1,424 | | Power density | 231.8 | 230.2 | Typical | 1,347 | | Temperature coefficient | -0.260 | -0.240 | Weak - bottom 18% | 511 | | Weight per kWp | 53.2 | 53.6 | Typical | 7,025 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.260 %/°C temperature coefficient** - Bottom 18% of the HJT 700-750 W segment, against a median of -0.240. - **Best for:** Utility-scale, commercial, shaded-installations and hot-climate. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 720 W - **Efficiency:** 23.18 % - **Voltage at Pmax (Vmp):** 43.91 V - **Current at Pmax (Imp):** 16.40 A - **Open-circuit voltage (Voc):** 51.11 V - **Short-circuit current (Isc):** 17.29 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.220 %/degC - **Temperature coefficient of Isc:** 0.047 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.3 kg - **Area:** 3.11 m2 - **Power density:** 231.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 90.3 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.30 % - **Output after 30 years:** 650 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1424 of 14005 | | Power density | 1347 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 7025 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Best-in-class temperature coefficient** - 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. - **Up to 23.82% efficiency – top of segment** - 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. - **Bifacial – additional rear-side energy yield** - 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. - **Low annual degradation rate thanks to HJT** - 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. - **15-year product warranty – above segment standard** - 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. ## Cons - **No BNEF Tier-1 status – limited bankability** - 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. - **Higher purchase cost of HJT vs. TOPCon** - 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). ## About this series 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. ## Notable figures - At 23.2% efficiency, this panel is on par with typical \*\*HJT 700-750W\*\* modules - Power density of 231.8 W/m² matches the \*\*HJT 700-750W\*\* median - Temperature coefficient of -0.26%/°C is 0.02pp worse than \*\*HJT 700-750W\*\* median (-0.24%/°C) - higher losses in summer heat - 85% bifaciality enables rear-side power generation, boosting yield by 4-13% on reflective surfaces - In the top 10% for efficiency among all HJT panels ## Questions ### What is HJT technology in the Just Solar JST-FCMH-(710-740)W-HD series and how does it compare to PERC and TOPCon? HJT (Heterojunction Technology) combines amorphous and monocrystalline silicon layers, achieving a temperature coefficient of approximately -0.26%/°C — significantly better than PERC (-0.34%/°C) or TOPCon (-0.30%/°C). In the JST-FCMH series this translates to lower power losses on hot days and higher annual energy yield. The half-cut cell layout further reduces resistive losses and improves stability under partial shading. ### Are the Just Solar JST-FCMH-(710-740)W-HD panels bifacial, and how much extra energy can the rear side generate? Yes, the JST-FCMH series is bifacial — it absorbs light from both front and rear surfaces. HJT's bifaciality factor of 90–95% allows the rear side to contribute 10–25% additional yield depending on ground albedo (light gravel, concrete, or snow). The gain is most significant in ground-mount installations and flat-roof systems with adequate clearance beneath the modules. ### What warranty does the Just Solar JST-FCMH-(710-740)W-HD come with — product and power? The manufacturer provides a 15-year product warranty covering material and workmanship defects, and a 30-year linear power warranty. Given the typical HJT annual degradation rate of ~0.25%, modules maintain high output throughout the entire power warranty period. This is a key argument when calculating LCOE for commercial projects and utility-scale PV farms. ### How do the JST-FCMH-(710-740)W-HD modules perform in summer when rooftop surface temperatures exceed 60°C? HJT has one of the best temperature coefficients among commercial silicon modules — approximately -0.26%/°C. At 60°C, an HJT module retains several percentage points more power than a comparable PERC module. Over a full year this difference adds up to a measurable yield advantage, especially relevant at peak outputs of up to 740 Wp across large-scale installations. ### What type of installations are the Just Solar JST-FCMH-(710-740)W-HD modules best suited for? The large-format 710–740 Wp modules are optimized for utility-scale PV farms, industrial rooftops, and commercial projects where maximum power density per m² and minimized LCOE over the asset lifecycle are critical. Due to their large footprint, they are generally not the first choice for standard residential pitched-roof installs. ### Is Just Solar a Tier 1 manufacturer and does that matter when buying the JST-FCMH series? Just Solar is not currently listed among Tier 1 manufacturers by Bloomberg NEF. This primarily reflects a limited track record of bankable project financing rather than inferior product quality. Before purchasing, verify warranty card availability and local service support in your region. For bank-financed or insured projects, ask your distributor about additional contractual security arrangements. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/740hjt-1336b31b6ab3.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -40 W, lighter, +2.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -45 W, lighter, +1.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | -20 W, lighter, +1.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -25 W, lighter, +1.7 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | -50 W, lighter, +1.6 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | -50 W, lighter, +1.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | -50 W, lighter, +1.6 pp | | [Just Solar JST-FCMH-710W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-710w-hd) | 710 W | -10 W, -0.3 pp | | [Just Solar JST-FCMH-715W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-715w-hd) | 715 W | Very close match | | [Just Solar JST-FCMH-725W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-725w-hd) | 725 W | Very close match | | [Just Solar JST-FCMH-730W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-730w-hd) | 730 W | +10 W, +0.3 pp | | [Just Solar JST-FCMH-735W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-735w-hd) | 735 W | +15 W, +0.5 pp | | [Just Solar JST-FCMH-740W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-740w-hd) | 740 W | +20 W, +0.6 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +85 W, heavier, +1.9 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +80 W, heavier, +1.7 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +75 W, heavier, +1.6 pp | --- Source: https://comparepv.com/panel/just-solar-jst-fcmh-720w-hd Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.