--- title: "JA Solar JAM60D20-370/MB/1500V 370W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM60D20-370/MB/1500V 370W solar panel. Specs: 19.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-370-mb-1500v" image: "https://comparepv.com/og/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-370-mb-1500v.png" updated: 2026-09-11 --- # JA Solar JAM60D20-370/MB/1500V Warranty pick, heavy for its output 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM60D20-370/MB/1500V - **Series:** JAM60D20 360-385/MB/1500V - **Rated power:** 370 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 370 W | 380 W | Typical | | | Module efficiency | 19.80% | 19.90% | Typical | 12,416 | | Power density | 198.3 | 199.0 | Typical | 12,388 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 23.0 kg | 21.4 kg | Weak - bottom 18% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 13% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 19.80% | 19.90% | Typical | 12,416 | | Power density | 198.3 | 199.0 | Typical | 12,388 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 62.2 | 55.8 | Weak - bottom 18% | 12,746 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 13% | 21 | ### Strengths - **30 year performance warranty** - Top 13% of the PERC 350-400 W segment, against a median of 25 yrs. ### Watch out for - **62.2 kg per kWp** - Bottom 18% of the PERC 350-400 W segment, against a median of 55.8. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 370 W - **Efficiency:** 19.80 % - **Voltage at Pmax (Vmp):** 33.98 V - **Current at Pmax (Imp):** 10.89 A - **Open-circuit voltage (Voc):** 41.21 V - **Short-circuit current (Isc):** 11.41 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.272 %/degC - **Temperature coefficient of Isc:** 0.044 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 120 - **Bifacial:** yes ### Physical - **Length:** 1774 mm - **Width:** 1052 mm - **Thickness:** 35 mm - **Weight:** 23.0 kg - **Area:** 1.87 m2 - **Power density:** 198.3 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 314 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12416 of 14005 | | Power density | 12388 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 12746 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Bifacial double-glass construction** - The module generates power from both the front and rear sides, while double-glass encapsulation eliminates backsheet degradation risks (PID, moisture ingress, UV stress). Compared to standard backsheet modules, double-glass construction extends real-world service life — critical under a 30-year linear power warranty. - **Half-cut MBB PERC – shade tolerance** - The 120 half-cut cell layout with multi-busbar interconnection lowers operating current per cell, reducing hot spot risk. Cell halving limits the impact of partial shading on the string, improving yield predictability under real-world irradiance conditions. - **1500 V system compatibility** - A 1500 V maximum system voltage enables longer string configurations and reduces BoS costs (cabling, protection devices, inverters). This is a key advantage for commercial rooftops, industrial halls, and ground-mount PV farms where lower system costs directly improve LCOE. - **30-year linear power warranty** - JA Solar guarantees ≥80% of rated power output after 30 years, backed by a 12-year product warranty. BNEF Tier 1 bankability status (Q2 2026) provides additional assurance of warranty enforceability across the full project lifetime. - **JA Solar – Tier 1 manufacturer (BNEF Q2 2026)** - JA Solar maintains BNEF Tier 1 bankability status with annual production capacity exceeding 100 GWp. This enables project finance access and supply-chain stability for utility-scale and commercial developers globally. ## Cons - **Series discontinued (2022)** - The JAM60D20 was manufactured between 2020 and 2022 and has been officially discontinued. Limited secondary-market availability makes system expansion or single-module replacement difficult. The risk of power-output mismatch during future module substitutions increases over time, even with formal warranty support maintained by JA Solar. - **PERC technology – higher Tcoeff. vs N-type** - The Pmax temperature coefficient is -0.354%/°C, typical for PERC technology. Newer N-type TOPCon modules — including later JA Solar generations — achieve -0.29 to -0.30%/°C. In hot climates or poorly ventilated roof installations this gap translates to measurably higher power losses during summer peak irradiance hours. - **Max efficiency 20.6% – below peer benchmark** - The series tops out at 20.6% efficiency, compared to 20.9% for the KB Solar KBS-MONO-BF and 20.7% for the Solarwatt Panel vision GM 3.0 pure. On a fixed roof area this gap translates to approximately 1–1.5% lower annual yield, relevant for space-constrained installations. ## About this series The JA Solar JAM60D20 360-385/MB/1500V series is designed with long-term, stable operation in mind, even under challenging environmental conditions. These **bifacial** modules, featuring a **double glass** construction, demonstrate superior resilience to humidity, temperature fluctuations, and demanding site conditions compared to typical panels with a rear foil. The application of **PERC technology** combined with a half-cell configuration and **multi busbar** interconnections translates to higher resistance to partial shading losses and reduced risk of localized hotspots, effectively improving the predictability of energy yields during daily operation. This model is an excellent choice when reliable performance on long strings and compatibility with modern system architectures are crucial. The modules are designed for **1500 V systems**, simplifying the design of larger installations. They are suitable for both commercial rooftops and industrial halls, as well as ground-mounted PV farms and ground-based projects, where the additional yield from the rear side of the module can be significant. ## Notable figures - At 19.8% efficiency, this panel is on par with typical \*\*PERC 0-400W\*\* modules - At 198.3 W/m² power density, this panel generates 3.9 W/m² more per unit area than \*\*PERC 0-400W\*\* median (194.4 W/m²) - At -0.35%/°C, hot weather performance is typical for \*\*PERC 0-400W\*\* panels - Weight of 23.0 kg is 2.5 kg above \*\*PERC 0-400W\*\* median (20.5 kg) - verify structural support - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### Is the JA Solar JAM60D20 360-385/MB/1500V series still available for purchase? The JAM60D20 360-385/MB series has been discontinued by JA Solar, meaning new factory shipments are no longer available. Some units may still be found in distributor warehouse stock, but availability is limited and uncertain. For new installations, it is advisable to consider currently produced JA Solar series offering higher wattages and more recent cell technology. ### What warranties come with the JA Solar JAM60D20 385W panels? JA Solar provided two separate warranties for this series: a 12-year product warranty covering manufacturing defects and material failures, and a 30-year linear power output warranty guaranteeing at least 80% of rated power at the end of that period. Both are standard for a Tier 1 manufacturer and allow predictable energy yield modeling across the full operational lifetime of the installation. ### What does bifacial mean in the JAM60D20 series and is it worth the premium? Bifacial means the cells harvest light from both the front glass and the rear glass surface, capturing reflected irradiance from the ground or mounting surface. Under favorable conditions such as light-colored substrates or ground-mount racking, bifacial gain can add several percentage points of extra output above nameplate wattage. On a standard dark rooftop the gain is modest, but the double glass construction still delivers superior moisture resistance and long-term durability regardless. ### Are the JAM60D20 360-385/MB/1500V panels suitable for large-scale and ground-mount installations? Yes, this series was designed with utility-scale and commercial projects in mind. The 1500 V system voltage enables longer strings with fewer inverters and less DC cabling, reducing overall balance-of-system (BoS) costs. The bifacial double glass construction and high mechanical load rating make the modules well suited to open-field PV farms where wind exposure and moisture levels are higher than on rooftops. ### How do the half-cut cell layout and multi busbar design affect shading performance of the JAM60D20? The half-cut cell design splits each cell into two smaller half-cells connected in parallel, reducing resistive losses and lowering the risk of hot-spot formation. The multi busbar interconnection distributes current across more conductive paths, so partial shading on one section of the module has a smaller impact on the total string output than in conventional full-cell panels. Both features together improve energy yield predictability in real-world, non-ideal conditions. ### Do JA Solar JAM60D20 modules perform well in winter and low-irradiance conditions? PERC technology improves the collection of photons under diffuse and low-angle irradiance, which is typical of overcast winter days. The double glass construction prevents moisture ingress and backsheet degradation from freeze-thaw cycles. Silicon PV modules also benefit from a negative temperature coefficient of power, meaning output exceeds nameplate rating on cold clear days, partially compensating for the shorter winter daylight hours. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20210706052925752-a4ec99b872e9.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +3.3 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +3.3 pp | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | -50 W, lighter, +3.2 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -30 W, lighter, +3.2 pp | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | -10 W, lighter, +3.2 pp | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | +10 W, lighter, +3.2 pp | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +30 W, lighter, +3.2 pp | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | +30 W, lighter, +3.2 pp | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | +10 W, lighter, +3.2 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.8 pp, +10 yr warranty | | [JA Solar JAM60D20-360/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-360-mb-1500v) | 360 W | -10 W, -0.5 pp | | [JA Solar JAM60S21-365/MR/1000V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v) | 365 W | Lighter, -5 yr warranty | | [JA Solar JAM60D20-365/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-365-mb-1500v) | 365 W | Very close match | | [JA Solar JAM60S21-370/MR/1000V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60s21-370-mr-1000v) | 370 W | Lighter, -5 yr warranty | | [JA Solar JAM60S20-375/MR](https://comparepv.com/panel/ja-solar-jam60s20-375-mr-1) | 375 W | Lighter, +0.4 pp, -5 yr warranty | | [JA Solar JAM60D20-375/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-375-mb-1500v) | 375 W | +0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +140 W, cooler, +5.2 pp | --- Source: https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-370-mb-1500v Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.