--- title: "JA Solar JAM60S20-375/MR 375W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM60S20-375/MR 375W solar panel. Specs: 20.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam60s20-375-mr-1" image: "https://comparepv.com/og/panel/ja-solar-jam60s20-375-mr-1.png" updated: 2026-09-11 --- # JA Solar JAM60S20-375/MR Solid all-round for its segment 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM60S20-375/MR - **Series:** JAM60S20 370-395/MR Series - **Rated power:** 375 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 375 W | 380 W | Typical | | | Module efficiency | 20.20% | 19.90% | Typical | 11,956 | | Power density | 201.5 | 199.0 | Typical | 12,046 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 20.2 kg | 21.4 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.20% | 19.90% | Typical | 11,956 | | Power density | 201.5 | 199.0 | Typical | 12,046 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 53.9 | 55.8 | Typical | 8,010 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 375 W - **Efficiency:** 20.20 % - **Voltage at Pmax (Vmp):** 34.50 V - **Current at Pmax (Imp):** 10.87 A - **Open-circuit voltage (Voc):** 41.45 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 ### Physical - **Length:** 1769 mm - **Width:** 1052 mm - **Thickness:** 30 mm - **Weight:** 20.2 kg - **Area:** 1.86 m2 - **Power density:** 201.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 308 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11956 of 14005 | | Power density | 12046 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 8010 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-cut cells + Multi-busbar (MBB)** - The 120 half-cut cell layout reduces I²R resistive losses by roughly 50% compared to full-cell modules, lowers hot-spot risk, and improves micro-crack resistance. The bottom half of the module continues generating power when the top half is shaded, delivering higher annual energy yield under real-world partial-shading conditions. - **Module efficiency 19.9–21.2%** - The efficiency range clearly outperforms the directly comparable Waaree EDO PRO (19.83%) and far exceeds the HT-SAAE HT48-18X(ND) TOPCon module (15.4%). The gap to the segment leader Meyer Burger Black (21.5%) is at most 0.3 percentage points, typically at a significantly lower purchase price. - **High mechanical load ratings** - Modules are certified for snow loads up to 5,400 Pa (≈550 kg/m²) and wind loads up to 2,400 Pa, qualifying them for demanding installation environments: flat roofs, alpine zones, and high-snowfall regions. These ratings exceed typical requirements for residential PV installations. - **BNEF Tier-1 bankable manufacturer** - JA Solar (founded 2005) has held BNEF Tier-1 status continuously for years, with annual shipments exceeding 80 GW and manufacturing capacity of 100 GWp. Bankable status facilitates project finance from lending institutions and minimizes counterparty risk — critical for commercial installations with 20–25-year payback horizons. - **Favorable temperature coefficient –0.35%/°C** - The Pmax temperature coefficient of –0.35%/°C outperforms the –0.40%/°C typical of older polycrystalline modules. At a realistic cell temperature of 65°C, the power loss relative to STC is approximately 14%, ensuring stable energy production on hot summer days. ## Cons - **Discontinued series** - The JAM60S20 series, launched in 2020, has been discontinued. Availability of new units at major distributors is limited or zero, making it impossible to expand an existing installation with identical modules. The absence of active OEM technical support for this product line increases operational risk for post-2025 servicing. - **PERC – older-generation cell technology** - P-type PERC cells are susceptible to LID (Light Induced Degradation), which is absent in N-type TOPCon and HJT cells. PERC annual degradation rates typically run 0.50–0.55%/yr versus ~0.40%/yr for TOPCon; over 25 years that translates to roughly 2.5–3.75 pp lower power retention. The market has clearly shifted toward N-type technology. - **12-year product warranty** - The 12-year workmanship warranty matched the minimum industry standard at the time of the 2020 launch. Newer premium series (Meyer Burger Black: 25 years; rising Tier-1 standard: 15 years) provide significantly longer coverage — an important consideration for commercial projects with planned operating lives of 20–25 years. ## About this series JA Solar photovoltaic panels from the JAM60S20 370-395/MR series are an advanced solution based on **PERC-type monocrystalline cells**, which has been optimized for maximum efficiency in real operating conditions. The key distinguishing feature of this series is **half-cut cell technology**, which effectively reduces energy losses resulting from internal resistance and improves the temperature stability of the module. Thanks to the use of **Multi-busbar (MBB)** construction, these panels are characterized by increased resistance to micro-cracks and better current flow, which directly translates into a longer lifespan for the entire installation. This series perfectly solves the problem of partial shading - the split module design means that the lower part can work independently when the upper part remains in the shade. It is a product dedicated to investors looking for a middle ground between high quality and a reasonable price, performing perfectly in both residential micro-installations and on commercial roofs. Compared to the competition, the JAM60S20 stands out with its **high resistance to mechanical loads** and an excellent power temperature coefficient, which guarantees stable energy yields even during hot days. It is a solid foundation for any PV system, focusing on proven technical innovations. ## Notable figures - At 20.2% efficiency, this panel is 0.8pp above typical \*\*PERC 0-400W\*\* modules (median: 19.4%) - Power density of 201.5 W/m² packs 7.1 W/m² more into the same footprint vs \*\*PERC 0-400W\*\* median (194.4 W/m²) - At -0.35%/°C, hot weather performance is typical for \*\*PERC 0-400W\*\* panels - #11956 for efficiency, #10419 for temperature performance out of 14005 panels ## Questions ### Is the JA Solar JAM60S20 370-395/MR series still available for purchase? The JAM60S20 370-395/MR series has been discontinued by JA Solar and is no longer part of the manufacturer's active lineup. It may still be found as leftover stock at select distributors. If current availability is important, consider JA Solar's newer PERC half-cut series, which offer comparable or improved specifications and are actively manufactured. ### What warranty does the JA Solar JAM60S20 370-395/MR come with? The JAM60S20 370-395/MR modules carry a 12-year product warranty covering material and manufacturing defects, along with a 25-year linear power output warranty. After 25 years, JA Solar guarantees at least 84.8% of the module's original rated power, providing solid long-term protection for your investment. ### How does the JAM60S20 395W handle high temperatures in summer? The series has a power temperature coefficient (Pmax) of -0.35%/°C, meaning output drops by only 0.35% for each degree Celsius above 25°C. This is among the better ratings for PERC modules and translates into a more stable energy yield even on the hottest summer days compared to older module technologies. ### Can the JAM60S20 MR panels withstand heavy snow loads and strong winds? Yes. The JAM60S20 MR series is certified for a snow load of up to 5400 Pa (roughly 550 kg/m²) and a wind load of up to 2400 Pa. These ratings make the panels suitable for demanding climates with significant snowfall or strong winds, ensuring reliable structural integrity over the long term. ### What is the half-cut cell technology in the JAM60S20 series and why does it matter for partial shading? Half-cut technology splits each PERC cell in two, reducing operating current and resistive losses within the module. Crucially, the panel is divided into two electrically independent halves: when the upper half is shaded by a chimney or antenna, the lower half continues generating power at full capacity, significantly reducing overall energy losses from partial shading. ### Is the JAM60S20 370-395/MR suitable for a sloped residential roof? Yes, the JAM60S20 MR series is well-suited for sloped residential rooftops. The module measures 1776×1052 mm and weighs only 20.7 kg, making it straightforward to transport up a roof and install on standard rafter structures. The series performs equally well in small residential microinstallations and larger commercial rooftop systems. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JAM60S20-MR-78dad50fbfe2.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, +2.9 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +2.9 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +25 W, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | +25 W, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | Lighter, +2.8 pp, +5 yr warranty | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.4 pp, +15 yr warranty | | [Maxeon SPR-MAX3-425-R](https://comparepv.com/panel/maxeon-spr-max3-425-r) | 425 W | Cooler, +2.2 pp, +15 yr warranty | | [JA Solar JAM60D20-360/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-360-mb-1500v) | 360 W | Heavier, -0.9 pp, +5 yr warranty | | [JA Solar JAM60S21-365/MR/1000V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v) | 365 W | -10 W, lighter, -0.6 pp | | [JA Solar JAM60D20-365/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-365-mb-1500v) | 365 W | Heavier, -0.6 pp, +5 yr warranty | | [JA Solar JAM60D20-370/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-370-mb-1500v) | 370 W | Heavier, -0.4 pp, +5 yr warranty | | [JA Solar JAM60S21-370/MR/1000V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60s21-370-mr-1000v) | 370 W | Lighter, -0.3 pp | | [JA Solar JAM60D20-375/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60d20-375-mb-1500v) | 375 W | Heavier, +5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +135 W, cooler, +4.8 pp | --- Source: https://comparepv.com/panel/ja-solar-jam60s20-375-mr-1 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.