--- title: "Rarlon PV Tech RL305HP-120 305W Solar Panel - Specs & Review | ComparePV" description: "Rarlon PV Tech RL305HP-120 305W solar panel. Specs: 18.30% efficiency, Polycrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/rarlon-pv-tech-rl305hp-120" updated: 2026-09-11 --- # Rarlon PV Tech RL305HP-120 Middle of its segment, weak in heat 286 panels in the segment PERC 300-350 W ## Identity - **Manufacturer:** Rarlon PV Tech - **Model:** RL305HP-120 - **Series:** RL290HP-310HP-120 - **Rated power:** 305 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 300-350 W (286 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 305 W | 325 W | Weak - bottom 9% | | | Module efficiency | 18.30% | 19.00% | Typical | 13,161 | | Power density | 180.8 | 190.0 | Typical | 13,188 | | Temperature coefficient | -0.390 | -0.360 | Weak - bottom 15% | 13,579 | | Weight (kg) | 18.5 kg | 19.0 kg | Typical | | | Performance warranty | - | 25 yrs | | | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 18.30% | 19.00% | Typical | 13,161 | | Power density | 180.8 | 190.0 | Typical | 13,188 | | Temperature coefficient | -0.390 | -0.360 | Weak - bottom 15% | 13,579 | | Weight per kWp | 60.7 | 60.0 | Typical | 12,503 | | Performance warranty | - | 25 yrs | | | ### Watch out for - **-0.390 %/°C temperature coefficient** - Bottom 15% of the PERC 300-350 W segment, against a median of -0.360. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 305 W - **Efficiency:** 18.30 % - **Voltage at Pmax (Vmp):** 31.88 V - **Current at Pmax (Imp):** 9.57 A - **Open-circuit voltage (Voc):** 38.95 V - **Short-circuit current (Isc):** 10.03 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.390 %/degC - **Temperature coefficient of Voc:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Polycrystalline - **Cell technology:** PERC - **Cell count:** 120 ### Physical - **Length:** 1684 mm - **Width:** 1002 mm - **Thickness:** 35 mm - **Weight:** 18.5 kg - **Area:** 1.69 m2 - **Power density:** 180.8 Wp/m2 ### Warranty and degradation ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13161 of 14005 | | Power density | 13188 of 14005 | | Temperature coefficient | 13579 of 14005 | | Weight | 12503 of 14005 | | Warranty | 13880 of 14005 | ## Pros - **120-cell layout reduces partial-shading losses** - Splitting the module into 120 cells with corresponding bypass sections manages current flow better under partial shading (chimney, tree, dormer) than classic 60-cell layouts, limiting yield drops in typical residential rooftop installations. - **Positive power tolerance** - The module is rated with a 0/+W power tolerance, meaning actual output should not fall below the nameplate value - this simplifies precise system design and removes the risk of underestimating energy production, unlike series with symmetric tolerance (e.g. ±3%). - **Reinforced mechanical build** - Tempered glass and an anodized aluminum frame provide resistance to snow and wind loads typical of the Polish climate, which is relevant for pitched-roof mounts exposed to heavy winter loading. - **Competitive efficiency vs. part of the segment** - Efficiency of 17.45-18.6% places the series above the Selfa SV120M.3.2 module (17% at the same 310 Wp power), meaning a slightly smaller array footprint than this specific competitor at a comparable price point. - **Established market presence since 2019** - The series has been in production since 2019 and remains active (not discontinued), giving it several years of field track record and lower risk of early design flaws typical of newly launched product lines. ## Cons - **No confirmed BNEF Tier-1 status** - Rarlon PV Tech does not appear on BloombergNEF's Tier-1 list, meaning it lacks confirmed bankability (min. 6 projects financed on a non-recourse basis by 6 different banks within 2 years) - unlike Canadian Solar (KuBlack, BiKu), which regularly appears on that list. This can complicate financing for larger commercial installations. - **Efficiency below top peers at the same power rating** - At the identical 310 Wp power rating, Canadian Solar modules reach 18.4-18.7% efficiency, while this series tops out at 18.6% and its lower-power variants drop to just 17.45% - in practice the weaker variants of this series need more roof area than comparable KuBlack or BiKu modules. - **Older PERC technology, no bifacial option** - The series relies solely on monofacial PERC cells dating to 2019, with no dual-sided variant - Canadian Solar's competing BiKu series offers bifacial technology at the same 310 Wp power, which on light-colored surfaces (e.g. a white membrane roof) can add 5-10% extra yield unavailable in the Rarlon module. ## About this series The Rarlon PV Tech RL290HP-310HP-120 series is designed for stable operation in real-world installation conditions, even in areas where partial shading, dirt, or uneven sunlight exposure occurs. The use of a **120-cell** configuration helps to better manage current flow in the module and reduce losses due to partial shading. This is a practical advantage in rooftop installations for homes, small businesses, and commercial buildings, where shade from chimneys, trees, or skylights is common. Another noteworthy feature is the **positive power tolerance** - the module is guaranteed to deliver at least its specified performance, which simplifies installation design and yield predictions. The construction also supports resistance to external conditions thanks to **tempered glass** and an **anodized aluminum frame**, which ensures durability in windy and snowy conditions. This series is for investors who want a good balance: solid quality, predictable performance, and compatibility with popular mounting solutions - without paying extra for features that don't increase yields in Polish conditions. ## Notable figures - Module efficiency of 18.3% is 1.1pp below average for \*\*PERC 0-400W\*\* panels (median: 19.4%) - 180.8 W/m² power density is 13.7 W/m² below \*\*PERC 0-400W\*\* median (194.4 W/m²) - requires larger installation area - -0.39%/°C temperature coefficient - 0.03pp worse than \*\*PERC 0-400W\*\* median (-0.36%/°C), expect higher hot weather losses - Weight of 18.5 kg (2.0 kg below \*\*PERC 0-400W\*\* median of 20.5 kg) allows easier transport and roof mounting - In the top 94% for efficiency among all PERC panels ## Questions ### Do the Rarlon PV Tech RL290HP-310HP-120 panels handle partial shading from a chimney or nearby trees? Yes, the RL290HP-310HP-120 series was specifically designed for real-world conditions that include partial shading. The 120-cell layout improves current management within the module and significantly reduces losses caused by partial obstruction. This is a key advantage on residential rooftops where chimneys, dormers, or nearby trees cast shade for a significant part of the day throughout the year. ### What is PERC technology in the RL290HP-310HP-120 series, and is it worth paying for? PERC (Passivated Emitter and Rear Cell) adds a passivation layer on the rear of each cell, allowing more photons to be converted into electricity. In the RL290HP-310HP-120 series this enables output up to 310 Wp within a compact 120-cell configuration. For a typical residential system it delivers higher energy yield per square meter compared to older standard BSF cells. PERC is the baseline technology here, not a premium add-on. ### What does the positive power tolerance in the Rarlon RL290HP-310HP-120 series mean in practice? Positive power tolerance means the module delivers at least its rated power — e.g., 310 Wp — and may slightly exceed it. For the system owner this ensures the installation is never underperforming its design specifications. In practice it enables more accurate annual energy yield estimates and means real-world output meets or exceeds the nameplate value rather than falling short of it. ### Are the Rarlon PV Tech RL290HP-310HP-120 panels suitable for a pitched roof on a single-family home? Yes, the RL290HP-310HP-120 series is a natural fit for residential prosumer installations on pitched roofs. The anodized aluminum frame is compatible with standard racking systems — rails and roof clamps — widely available in Poland. The modules withstand wind and snow loads thanks to tempered glass, which is especially important given Poland's climate conditions. ### How well do the Rarlon RL290HP-310HP-120 panels resist wind, snow, and hail? The RL290HP-310HP-120 series features tempered glass and an anodized aluminum frame engineered to handle mechanical loads typical of Polish weather — strong winds and accumulated snow. The tempered glass also provides standard hail impact protection for the underlying PERC cells. Exact allowable mechanical load ratings expressed in kg/m² should be verified in the manufacturer's datasheet. ### Are the Rarlon RL290HP-310HP-120 panels compatible with popular inverters available in Poland? Yes, the RL290HP-310HP-120 series is compatible with standard MPPT inverters widely available in Poland, such as SMA, Fronius, Huawei, and Growatt. When designing the system, verify the inverter's input voltage range against the module's Voc and Isc values from the datasheet and size the strings accordingly. The series does not use bifacial technology or proprietary connectors that would require dedicated hardware. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/290p-9f3ae1d0763c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [SunLink LNSK-340M](https://comparepv.com/panel/sunlink-lnsk-340m) | 340 W | +35 W, cooler, +1.8 pp | | [Canadian Solar CS3K-330P](https://comparepv.com/panel/canadian-solar-cs3k-330p) | 330 W | +25 W, cooler, +1.6 pp | | [Canadian Solar CS3K-335MB-AG](https://comparepv.com/panel/canadian-solar-cs3k-335mb-ag) | 335 W | Cooler, heavier, +1.6 pp | | [SunLink LNSK-335M](https://comparepv.com/panel/sunlink-lnsk-335m) | 335 W | +30 W, cooler, +1.5 pp | | [Canadian Solar CS3K-325P](https://comparepv.com/panel/canadian-solar-cs3k-325p) | 325 W | +20 W, cooler, +1.3 pp | | [SunLink LNSK-330M](https://comparepv.com/panel/sunlink-lnsk-330m) | 330 W | +25 W, cooler, +1.2 pp | | [Canadian Solar CS3K-320P](https://comparepv.com/panel/canadian-solar-cs3k-320p) | 320 W | +15 W, cooler, +1.0 pp | | [Rarlon PV Tech RL290HP-120](https://comparepv.com/panel/rarlon-pv-tech-rl290hp-120) | 290 W | -15 W, -0.9 pp | | [Rarlon PV Tech RL295HP-120](https://comparepv.com/panel/rarlon-pv-tech-rl295hp-120) | 295 W | -10 W, -0.6 pp | | [Rarlon PV Tech RL300HP-120](https://comparepv.com/panel/rarlon-pv-tech-rl300hp-120) | 300 W | -0.2 pp | | [Rarlon PV Tech RL310HP-120](https://comparepv.com/panel/rarlon-pv-tech-rl310hp-120) | 310 W | +0.3 pp | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +135 W, cooler, +4.6 pp | | [Jetion JT435SYk(B)](https://comparepv.com/panel/jetion-jt435syk-b) | 435 W | +130 W, cooler, +4.4 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | +95 W, cooler, +4.3 pp | | [Jetion JT430SYk(B)](https://comparepv.com/panel/jetion-jt430syk-b) | 430 W | +125 W, cooler, +4.1 pp | | [Lina Energy LEPV 400](https://comparepv.com/panel/lina-energy-lepv-400) | 400 W | +95 W, cooler, +4.0 pp | --- Source: https://comparepv.com/panel/rarlon-pv-tech-rl305hp-120 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.