Solid all-round for its segment
The JA Solar P2 series is designed for high energy production under real-world conditions, even when the roof is partially shaded and the weather is not ideal. The use of advanced monocrystalline solar cells and a refined electrical architecture helps to minimize losses and maintain stable performance throughout the day. In practice, this means a more cost-effective installation - without the need to "over-size" the system solely to compensate for drops in performance during challenging periods.
Compared to many other competitive solutions, the P2 series emphasizes reliability and long-term stability of performance, which will be appreciated by investors planning installations for many years. The module design is optimized for resistance to micro-cracks and mounting stresses, while also supporting performance under lower sunlight conditions. This makes it a good choice for single-family homes, businesses, and larger roof projects, where low lifetime energy costs and predictable system performance are key.
Ranking
Signals from the data
Residential and commercial.
JA Solar consistently appears on the BNEF Tier 1 bankable manufacturers list (confirmed Q1 2026), demonstrating the ability to supply projects exceeding 10 MW financed by at least six independent commercial banks. This ensures service availability, spare parts supply, and warranty obligations throughout the full 25-year operating lifetime.
Peak module efficiency of 17.1% matches the best result among peer comparables (MY Solar P2: 17.1%) and outperforms both ASM ASM170M and AU Optronics ASM Mono (both at 16.0%). This translates to approximately 7% higher energy yield per unit of roof area compared to weaker competitors in the 150-170 Wp segment.
The manufacturer guarantees linear power degradation over 25 years, enabling precise LCOE calculations and simplifying financial viability analyses. A 25-year horizon is the Tier-1 standard and meets the requirements of most externally financed projects.
The rear-surface passivation layer in PERC cells improves spectral response and efficiency at low irradiance levels (overcast mornings, diffuse light) compared to standard mono cells without PERC. In Poland's climate (approx. 1,000-1,100 kWh/m²/year, with a high proportion of low-irradiance days) this meaningfully increases annual energy yield.
The series covers 5 models across the 150-170 Wp range, enabling precise system sizing to available roof area without over-engineering the system or adding supplemental MPPT inputs to the inverter.
PERC modules degrade at 0.45-0.55%/year, while N-type TOPCon cells show 0.30-0.40%/year (SurgePV 2026 field data; manufacturer warranty baselines: PERC 0.55%/year vs. TOPCon 0.40%/year). Over 25 years, this results in a cumulative energy yield difference of approximately 3-4 percentage points against the P2 series.
The 150-170 Wp range sits far below the current market standard. Modern Tier-1 modules from the same manufacturer (JA Solar DeepBlue 4.0 Pro TOPCon: 580-620 Wp) deliver 3.5-4× higher unit power. A 10 kWp system using the P2 series requires approximately 59-67 modules versus 16-18 for 580 Wp panels - significantly higher BoS costs and installation labor.
The 12-year product warranty falls short of premium manufacturers (Panasonic: 25 years, REC Alpha: 20 years). After year 12, the cost of replacing a defective module rests with the investor, increasing total cost of ownership over the installation's lifetime.
- At 16.1% efficiency, this panel is 3.3pp below the PERC 0-400W median of 19.4%
- 161.4 W/m² power density is 32.8 W/m² below PERC 0-400W median (194.2 W/m²) - requires larger installation area
- Temperature coefficient of -0.37%/°C matches the PERC 0-400W median
- Weight of 11.2 kg (9.3 kg below PERC 0-400W median of 20.5 kg) allows easier transport and roof mounting
- Ranked #13745 out of 14129 panels for efficiency in the database
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
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About the P2 series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.