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Jinko Solar Brand review

JS320M

320 Wp PERC
ComparePV verdict

Strong in heat, no clear weak spot

Rank 13,516 of 14,129
Compare panels Datasheet PDF
Power (Wp)
320
Typical for its class
Efficiency (%)
19.00
Typical · median 19.00%
Density (Wp/m²)
189.6
Typical · median 190.0
Temp (%/°C)
-0.280
Strong · top 1%
Weight (kg)
19.0
Typical · median 19.0 kg
Warranty (yrs)
25
Typical · median 25 yrs

The Jinko Solar JS Solar 120 Series is designed for installations where maximum power density and predictable performance over the years are crucial, even under varying weather conditions. The use of modern cell architecture and a refined laminate construction results in high efficiency in real-world conditions - the panel performs better under partial shading, morning and evening solar dips, and higher temperatures.

This solution is for investors who want to minimize production losses while also simplifying installation design. Stable chain performance makes it easier to select inverters and protection devices, and enhanced mechanical strength helps in installations exposed to wind and snow loads.

The JS Solar 120 Series is suitable for rooftops of homes and businesses, carports, and projects where aesthetics and cable management are important. It stands out from many competing modules due to its balanced approach to performance and durability - without compromising daily operation.

Ranking

291 panels in the segment PERC 300-350 W
Metric This panel Median Position in segment Overall rank
Module efficiency 19.00% 19.00% Typical 13,037
Power density 189.6 190.0 Typical 13,047
Temperature coefficient -0.280 -0.360 Strong · top 1% 1,347
Weight per kWp 59.4 60.3 Typical 12,208
Performance warranty 25 yrs 25 yrs Typical 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 2 caution
Best for

Residential, commercial and shaded-installations.

Strengths
-0.280 %/°C temperature coefficient

Top 1% of the PERC 300-350 W segment, against a median of -0.360. Ranked 1,347th in the whole database.

What owners get
BNEF #1 bankability for a decade

JinkoSolar ranked #1 in the Bloomberg BNEF PV Module Bankability Survey with 100% bankability for 10 consecutive years (including 2024). For project finance scenarios, this is the strongest manufacturer credibility signal available among the listed peer comparables and the broader Tier-1 segment.

Up to 20.7% efficiency - above peer median

The top variant of the series reaches 20.7% module efficiency, outperforming the comparable JA Solar JAM60D10 (20.4%) and significantly surpassing Hiwatt HW-P372H (17.8%). Among listed peers, only YS Solar SM-90 (21%) marginally exceeds the JS Solar 120's top variant. The six-variant power range (320-350 Wp) supports flexible string design across different roof configurations.

120-cell half-cut format - improved shading tolerance

The 120-cell half-cut layout (60×2) halves the current path within each cell, reducing resistive losses and lowering operating cell temperature. Under partial shading, the module loses proportionally less power than a conventional 60-cell design, stabilizing MPPT string behavior and simplifying inverter and BoS selection.

25-year linear power warranty

The BNEF #1 Tier-1 manufacturer backs the series with a 25-year linear power output warranty - matching peer comparable JA Solar. The combination of long warranty terms and Jinko's demonstrated global service infrastructure (manufacturing on three continents) reduces counterparty risk in LCOE calculations.

Trade-offs
PERC technology - higher LID and degradation

P-type PERC cells are susceptible to Light-Induced Degradation (LID): first-year power loss typically reaches 1-3%, and annual degradation runs 0.6-0.8% vs. 0.4-0.5% for N-type TOPCon. Over a 25-year operating life, this translates to approximately 2-4 percentage points of cumulative yield deficit relative to N-type modules. As of 2024, TOPCon accounts for roughly 66% of global manufacturing capacity, surpassing PERC as the leading cell technology.

2019 design - missing modern features

The series launched in 2019 and has not received a generational upgrade to N-type or a bifacial variant in seven years on the market. The absence of bifacial capability forfeits rear-side irradiance gains (typically +5-25% in ground-mounted systems), and the P-type architecture carries a higher temperature coefficient (-0.36 to -0.39%/°C vs. -0.30%/°C for HJT), resulting in measurable summertime yield loss compared to current-generation alternatives.

Notes from the database
  • At 19.0% efficiency, this panel is on par with typical PERC 0-400W modules
  • Power density of 189.6 W/m² is 4.6 W/m² below PERC 0-400W median (194.2 W/m²) - needs more roof space
  • -0.28%/°C temperature coefficient (median: -0.36%/°C) - retains ~3% more power at high temperatures
  • Weight of 19.0 kg (1.5 kg below PERC 0-400W median of 20.5 kg) allows easier transport and roof mounting
  • In the top 92% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 320 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.00 % Typical Segment median 19.00%
Vmpp · Impp 33.40 V · 9.58 A Operating point at max power
Voc · Isc 40.10 V · 10.15 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1684×1002×35 mm · 1.69 m² of roof
Weight 19.0 kg Typical Typical · median 19.0 kg
Cells 120 · PERC Monocrystalline
Coefficient Pmax -0.280 %/°C Strong top 1% of its segment
Coefficient Voc · Isc -0.360 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 80.7 % Equals 246 W guaranteed

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.280 %/°C against a segment median of -0.360
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Jinko Solar JS320M 320 W 19.00% -0.280 19.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg -20 W, lighter, +4.3 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg -20 W, lighter, +4.3 pp
ZEUS 1.2 FullBlack 280W 280 W 23.31% -0.260 14.3 kg Lighter, +4.3 pp, +5 yr warranty
NS-330MH-80 330 W 23.15% -0.290 15.0 kg +10 W, lighter, +4.1 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg +10 W, lighter, +4.1 pp
ZEUS 3.2 285WP FullBlack 285 W 23.14% -0.260 15.6 kg -35 W, +4.1 pp, +5 yr warranty
GKA182M285W 285 W 23.00% - 10.8 kg Lighter, +4.0 pp, +5 yr warranty
GKA182M270W 270 W 23.00% - 10.8 kg -50 W, lighter, +4.0 pp
GKA182M300W 300 W 23.00% - 16.2 kg Lighter, +4.0 pp, +5 yr warranty
JKM325M-60H-V 325 W 19.26% -0.360 19.0 kg Hotter, +0.3 pp
JKM330M-60H-V 330 W 19.56% -0.360 19.0 kg +10 W, hotter, +0.6 pp
JKM335M-60H-V 335 W 19.85% -0.360 19.0 kg +15 W, hotter, +0.9 pp
JKM340M-60H-V 340 W 20.15% -0.360 19.0 kg +20 W, hotter, +1.1 pp
JKM345M-60H-V 345 W 20.45% -0.360 19.0 kg +25 W, hotter, +1.4 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +120 W, +3.9 pp, +5 yr warranty
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +115 W, +3.7 pp, +5 yr warranty

Found 114 panels of the same or similar size to this one, within ±10 mm. See them here Found 224 panels of the same or similar size to this one, within ±25 mm. See them here Found 470 panels of the same or similar size to this one, within ±50 mm. See them here Found 814 panels of the same or similar size to this one, within ±100 mm. See them here

About the JS Solar 120 Series series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the power output warranty for the Jinko Solar JS Solar 120 Series?
The JS Solar 120 Series comes with a 25-year linear power output warranty, meaning the manufacturer guarantees a defined minimum performance level throughout that period. Jinko Solar also provides a standard product warranty covering material and workmanship defects. As a Bloomberg NEF Tier 1 manufacturer, Jinko Solar is considered one of the most financially stable module suppliers, making their long-term warranty commitments credible.
How does the JS Solar 120 Series PERC panel perform in low-light and overcast conditions?
The PERC cell technology in the JS Solar 120 Series improves energy harvesting under diffuse irradiance, resulting in better performance on cloudy days and during morning or evening hours. The rear-surface passivation layer reduces electron recombination and boosts efficiency at low irradiance levels. In climates with frequent overcast conditions, this translates into measurably higher annual energy yield compared to standard P-type modules.
What is the maximum power output of the JS Solar 120 Series and how many panels does a household need?
Modules in the JS Solar 120 Series reach up to 350 Wp under STC conditions. For a typical single-family home with annual consumption of 4,000-5,000 kWh, you generally need 10 to 14 panels (a 3.5-5 kWp system). The exact number depends on usable roof area, orientation, tilt angle, and local solar irradiance. A certified PV installer should size the system based on an actual site assessment.
Are Jinko Solar JS Solar 120 Series panels suitable for a pitched roof with partial shading from a chimney or dormer window?
The JS Solar 120 Series is a solid choice for rooftop installations with layout constraints. PERC cell architecture limits hot-spot formation and reduces mismatch losses under partial shading compared to older polycrystalline technology. For roofs with significant shading, pairing the modules with power optimizers or microinverters is recommended - this isolates underperforming panels and prevents a single shaded module from pulling down the output of the entire string.
Does the JS Solar 120 Series perform well in winter and during high summer temperatures?
PERC panels, including the JS Solar 120 Series, handle cold winters well - lower cell temperatures actually increase efficiency, so bright winter days can be surprisingly productive. In summer, higher temperatures reduce voltage and power output. The temperature coefficient for Jinko Solar PERC modules is typically around -0.35 to -0.40%/°C, which is competitive among P-type technologies and helps limit thermal power losses during peak summer heat.
Is Jinko Solar a reliable manufacturer and where is the JS Solar 120 Series produced?
Jinko Solar is a Chinese manufacturer with a long-standing position on the Bloomberg NEF Tier 1 list, confirming its financial stability and ability to honor warranty obligations for the full 25-year term. The company is among the largest PV module suppliers globally and holds IEC, MCS, and other certifications required by European markets. Chinese origin does not imply lower quality - Jinko Solar undergoes independent third-party audits and consistently ranks among top performers in PV module reliability studies.
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