Strong in heat, modest efficiency
The Hiwatt Solar HW-M6/144H(440-460) series is designed as a half-cell N-type monocrystalline module, which allows for stable operation in challenging conditions and maintains high efficiency for a longer period. The use of half-cell splitting results in lower operating currents, which effectively reduces losses in connections and helps minimize the risk of localized overheating, especially in partially shaded or dirty conditions. A key feature of this series is enhanced PID resistance - which is important in installations operating at higher voltages and in varying humidity conditions. From an investor's perspective, good performance at high temperatures is also a significant advantage, leading to better summer performance and more predictable energy production. This is a good choice for rooftop and ground-mounted installations in Poland, where you need high power from a limited area, as well as reliability over many years of operation.
Ranking
Signals from the data
Residential, commercial, shaded-installations and hot-climate.
Tight roof space and roofs where every square metre has to count.
Top 24% of the PERC 400-450 W segment, against a median of -0.350.
Bottom 16% of the PERC 400-450 W segment, against a median of 20.60%.
Bottom 21% of the PERC 400-450 W segment, against a median of 206.2.
Splitting cells in half reduces operating currents by ~50%, lowering resistive losses and improving partial-shading tolerance. Compared to full-cell modules, power loss under row-shading events is several times lower because each half-cell substring operates independently.
The series includes dedicated Potential Induced Degradation protection, critical for systems operating above 1,000 V in variable-humidity conditions — typical of Polish rooftop installs in summer. Effective PID resistance prevents irreversible power loss in the string's outer modules.
The 440–460 Wp power range allows a target system size to be reached with fewer modules, reducing BoS costs (cabling, racking). For a typical 10 kWp residential system, only 22–23 panels are needed versus 28–33 panels with legacy 300–360 Wp modules.
The manufacturer guarantees linear power degradation over 25 years — on par with the mid-tier segment standard. This enables credible LCOE modeling and annual yield forecasts in both bank financing documents and prosumer energy audits.
The maximum 21% module efficiency lags direct peers: Risen RSM96-11-440-460BNDG reaches 23%, SunKean SKT440~460M12-96D4 reaches 23.02%. The ~2 pp gap means peers generate roughly 9–10% more energy from the same roof area, or equivalently save ~0.5 m² per 10 kWp compared to this series.
P-type PERC cells exhibit ~2% first-year LID and ~0.6–0.8%/year ongoing degradation, versus ~1% / ~0.4%/year for the N-type TOPCon used by Risen and SunKean. After 25 years, PERC modules retain approximately 83–85% of rated power, while TOPCon retains over 90% — a gap of roughly 500–700 kWh/year in lost generation for a 10 kWp system in its final decade of operation.
Hiwatt Solar does not appear on BNEF Tier-1 Bankable Manufacturer lists (verified Q1 2025 through Q1 2026). In practice, this blocks or significantly complicates bank financing for commercial and industrial (C&I) projects, where project agreements and insurers typically require modules from BNEF-listed Tier-1 manufacturers.
- Efficiency of 20.1% matches the PERC 400-450W median
- 202.4 W/m² power density is 3.8 W/m² below PERC 400-450W median (206.2 W/m²) - requires larger installation area
- At -0.34%/°C, hot weather performance is typical for PERC 400-450W panels
- At 24.0 kg, this panel is 2.0 kg heavier than the PERC 400-450W median (22.0 kg) - more demanding for installation crews
- #12102 for efficiency, #8778 for temperature performance out of 14005 panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Alternatives
Found 234 panels of the same or similar size to this one, within ±10 mm. See them here Found 325 panels of the same or similar size to this one, within ±25 mm. See them here Found 352 panels of the same or similar size to this one, within ±50 mm. See them here Found 1158 panels of the same or similar size to this one, within ±100 mm. See them here