--- title: "Hiwatt Solar HW-P285H 285W Solar Panel - Specs & Review | ComparePV" description: "Hiwatt Solar HW-P285H 285W solar panel. Specs: 17.20% efficiency, Polycrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hiwatt-solar-hw-p285h" updated: 2026-09-11 --- # Hiwatt Solar HW-P285H Solid all-round for its segment 1,394 panels in the 185-385 W band, all technologies ## Identity - **Manufacturer:** Hiwatt Solar - **Model:** HW-P285H - **Series:** HW-P360H(275-295) - **Rated power:** 285 W - **Cell technology:** Polycrystalline ## How it compares Compared against 185-385 W band, all technologies (1394 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 285 W | 335 W | Weak - bottom 22% | | | Module efficiency | 17.20% | 18.90% | Typical | 13,404 | | Power density | 171.9 | 189.0 | Typical | 13,406 | | Temperature coefficient | -0.340 | -0.360 | Typical | 8,778 | | Weight (kg) | 17.8 kg | 20.0 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 17.20% | 18.90% | Typical | 13,404 | | Power density | 171.9 | 189.0 | Typical | 13,406 | | Temperature coefficient | -0.340 | -0.360 | Typical | 8,778 | | Weight per kWp | 62.5 | 61.8 | Typical | 12,769 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 285 W - **Efficiency:** 17.20 % - **Voltage at Pmax (Vmp):** 31.63 V - **Current at Pmax (Imp):** 9.01 A - **Open-circuit voltage (Voc):** 38.86 V - **Short-circuit current (Isc):** 9.55 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Polycrystalline - **Cell count:** 60 ### Physical - **Length:** 1665 mm - **Width:** 996 mm - **Thickness:** 35 mm - **Weight:** 17.8 kg - **Area:** 1.66 m2 - **Power density:** 171.9 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:** 234 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13404 of 14005 | | Power density | 13406 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 12769 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Efficiency well above peer comparables** - The series delivers 16.6–17.8% module efficiency, significantly outperforming direct peers at the same 295 Wp maximum power: Huasun HSN-210R-B64 and 64 Half-cell HJT modules at 14.8%, and Solar-Fabrik Mono S4 Halfcut at 15.11%. The gap of up to +2.7 percentage points translates to a meaningfully smaller roof area required for the same system output. - **N-type half-cut cell technology** - N-type cells exhibit lower Light Induced Degradation (LID) compared to P-type PERC, resulting in higher annual energy yield over the system's lifetime. The half-cut cell architecture reduces resistive losses and improves performance under partial shading — a practical advantage on Polish rooftops with chimneys, dormers, and antennas. - **Enhanced anti-PID resistance** - The manufacturer declares elevated resistance to Potential Induced Degradation, critical in high-voltage string configurations (≥1000 V) and in Poland's climate of variable humidity and temperature swings. This mitigates the risk of permanent power loss across multi-module strings over long-term operation. - **Reduced hot-spot losses** - Optimized electrical design — including half-cut cell layout and independent bypass diodes — lowers the risk of localized overheating, one of the leading causes of mechanical damage and fire in rooftop installations. This results in improved operational safety over the system's lifetime. - **25-year linear power warranty** - Hiwatt Solar backs the series with a 25-year linear power output warranty, meeting European market expectations. For residential prosumers and small ground-mount farms, this provides financial predictability and full output protection throughout the typical financing period. ## Cons - **Series discontinued since 2023** - The HW-P360H(275-295) line ended production in 2023. New module availability is limited to remaining distributor stock, and sourcing additional panels for system expansion will become impossible over time. This represents a genuine risk in the event of panel damage or future capacity additions. - **Manufacturer not on BNEF Tier-1 list** - Hiwatt Solar does not appear on BloombergNEF's bankable Tier-1 module manufacturer list. For projects financed through bank loans or leasing, this can be a hard blocker — many lenders require Tier-1-listed products as collateral security over the full financing term. - **Peak power low by current market standards** - The 295 Wp ceiling was market-standard in 2021 (the release year), but the residential segment has moved to 400–440 Wp as the norm in 2025–2026. Installing these modules today requires approximately 35–40% more panels for the same peak output, increasing BoS costs (cabling, racking, and labor). - **12-year product warranty below current Tier-1 standard** - Leading Tier-1 manufacturers (e.g., LONGi, JA Solar, Jinko Solar) routinely offer 15-year product warranties on modules from the 2023–2025 generation. The HW-P360H's 12-year coverage provides 3 fewer years of full factory defect protection compared to today's competitive benchmark. ## About this series The Hiwatt Solar HW-P360H(275-295) series is designed for stable energy production in real-world operating conditions, rather than just in a laboratory setting. The modules utilize a **half-cell** design, which minimizes internal losses and improves panel performance under partial shading - a significant factor in Poland, where roofs often have chimneys, dormers, or antennas. The use of **N-type** technology helps maintain consistent energy yields over time, while also enhancing resistance to degradation-causing factors. The module's **increased PID resistance** is also noteworthy, as it is important in installations operating at higher system voltages and in environments with fluctuating humidity. The manufacturer also highlights **reduced hot-spot losses** due to an optimized electrical design, which translates to increased safety and a lower risk of localized overheating. This makes it a good choice for rooftop and small-scale installations, where predictability, durability, and lower energy costs over the entire lifespan are key considerations. ## Notable figures - Efficiency of 17.2% is 4.6pp below the \*\*database\*\* median (21.8%) - At 171.9 W/m², this panel generates 46.2 W/m² less per unit area than \*\*database\*\* median (218.1 W/m²) - -0.34%/°C temperature coefficient - 0.04pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - Weight of 17.8 kg (8.7 kg below \*\*database\*\* median of 26.5 kg) allows easier transport and roof mounting - In the top 96% for efficiency among all N-type panels ## Questions ### Is the Hiwatt Solar HW-P360H(275-295) series still available for purchase? The HW-P360H(275-295) series has been discontinued and is no longer available through regular distribution channels. If you need a comparable replacement — a half-cut N-type module with PID resistance — contact your distributor about current Hiwatt Solar alternatives or equivalent panels from another manufacturer with a similar technical specification. ### What warranty does the Hiwatt Solar HW-P360H(275-295) series carry? Hiwatt Solar offered a 12-year product warranty covering manufacturing and material defects, plus a 25-year linear power output warranty. The linear power warranty guarantees the module will maintain at least the manufacturer-specified percentage of rated wattage over 25 years of operation — a standard benchmark for estimating real-world energy yield across the system's full lifetime. ### What does N-type cell technology mean for the HW-P360H and does it matter under Polish conditions? N-type cells degrade more slowly under UV exposure and fluctuating humidity compared to conventional P-type cells. In Poland's climate — characterized by variable irradiance, frost cycles, and periods of high humidity — a lower annual degradation rate directly translates to higher energy yield and a better LCOE across the full 25-year power warranty period. ### Can the HW-P360H(275-295) handle shading from a chimney or dormer window? Yes. The half-cut cell design splits the module into two independent electrical halves, so shade falling on one section does not shut down output from the other. On Polish residential rooftops with chimneys, dormers, or antennas, this significantly reduces energy losses during hours when only part of the module is shaded — which can meaningfully improve annual yield for a typical prosumer system. ### What is the maximum power output of the HW-P360H and how should it factor into inverter sizing? The top-rated module in the series is 295 Wp. When designing string arrays, select an inverter whose MPPT voltage range covers actual string voltages across operating temperatures. The superior temperature coefficient of N-type cells means string voltage on cold winter mornings will be higher — this must be accounted for in calculations to ensure the string voltage does not exceed the inverter's maximum DC input voltage. ### Is Hiwatt Solar a Tier 1 manufacturer and was the HW-P360H series a safe choice? Hiwatt Solar does not appear on Tier 1 manufacturer lists published by independent agencies such as Bloomberg NEF. This does not automatically mean poor module quality — the company holds IEC certifications and uses established cell technologies. However, Tier 1 status can influence financing terms (bank loans, PV leasing products) and risk assessments by insurers. For a standard residential prosumer installation, the practical difference in day-to-day module performance is typically negligible. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HW-P360H-275-295-1da0d55dfb1c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Canadian Solar CS3K-330P](https://comparepv.com/panel/canadian-solar-cs3k-330p) | 330 W | +45 W, hotter, +2.7 pp | | [Canadian Solar CS3K-335MB-AG](https://comparepv.com/panel/canadian-solar-cs3k-335mb-ag) | 335 W | +50 W, +2.7 pp, +5 yr warranty | | [SunLink LNSK-335M](https://comparepv.com/panel/sunlink-lnsk-335m) | 335 W | +50 W, heavier, +2.6 pp | | [Canadian Solar CS3K-325P](https://comparepv.com/panel/canadian-solar-cs3k-325p) | 325 W | +40 W, hotter, +2.4 pp | | [SunLink LNSK-330M](https://comparepv.com/panel/sunlink-lnsk-330m) | 330 W | +45 W, heavier, +2.3 pp | | [Canadian Solar CS3K-320P](https://comparepv.com/panel/canadian-solar-cs3k-320p) | 320 W | +35 W, hotter, +2.1 pp | | [SunLink LNSK-325M](https://comparepv.com/panel/sunlink-lnsk-325m) | 325 W | +40 W, heavier, +2.0 pp | | [Hiwatt Solar HW-P360H-275](https://comparepv.com/panel/hiwatt-solar-hw-p360h-275) | 275 W | -10 W, -0.6 pp | | [Hiwatt Solar HW-P360H-280](https://comparepv.com/panel/hiwatt-solar-hw-p360h-280) | 280 W | -0.3 pp | | [Hiwatt Solar HW-P360H-290](https://comparepv.com/panel/hiwatt-solar-hw-p360h-290) | 290 W | +0.3 pp | | [Hiwatt Solar HW-P360H-295](https://comparepv.com/panel/hiwatt-solar-hw-p360h-295) | 295 W | +10 W, +0.6 pp | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +155 W, cooler, +5.7 pp | | [Jetion JT435SYk(B)](https://comparepv.com/panel/jetion-jt435syk-b) | 435 W | +150 W, cooler, +5.5 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | +115 W, +5.4 pp, +15 yr warranty | | [Jetion JT430SYk(B)](https://comparepv.com/panel/jetion-jt430syk-b) | 430 W | +145 W, cooler, +5.2 pp | | [Lina Energy LEPV 400](https://comparepv.com/panel/lina-energy-lepv-400) | 400 W | +115 W, cooler, +5.1 pp | --- Source: https://comparepv.com/panel/hiwatt-solar-hw-p285h Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.