--- title: "Rarlon PV Tech RL355HM-120 355W Solar Panel - Specs & Review | ComparePV" description: "Rarlon PV Tech RL355HM-120 355W solar panel. Specs: 19.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/rarlon-pv-tech-rl355hm-120" updated: 2026-09-11 --- # Rarlon PV Tech RL355HM-120 Middle of its segment, weak in heat 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** Rarlon PV Tech - **Model:** RL355HM-120 - **Series:** RL350HM-370HM-120 - **Rated power:** 355 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 355 W | 380 W | Weak - bottom 7% | | | Module efficiency | 19.50% | 19.90% | Typical | 12,663 | | Power density | 194.9 | 199.0 | Typical | 12,667 | | Temperature coefficient | -0.390 | -0.350 | Weak - bottom 3% | 13,579 | | Weight (kg) | 19.5 kg | 21.4 kg | Typical | | | Performance warranty | - | 25 yrs | | | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 19.50% | 19.90% | Typical | 12,663 | | Power density | 194.9 | 199.0 | Typical | 12,667 | | Temperature coefficient | -0.390 | -0.350 | Weak - bottom 3% | 13,579 | | Weight per kWp | 54.9 | 55.8 | Typical | 9,311 | | Performance warranty | - | 25 yrs | | | ### Watch out for - **-0.390 %/°C temperature coefficient** - Bottom 3% of the PERC 350-400 W segment, against a median of -0.350. Ranked 13,579th in the whole database. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 355 W - **Efficiency:** 19.50 % - **Voltage at Pmax (Vmp):** 33.50 V - **Current at Pmax (Imp):** 10.60 A - **Open-circuit voltage (Voc):** 40.70 V - **Short-circuit current (Isc):** 11.10 A ### 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:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 120 ### Physical - **Length:** 1755 mm - **Width:** 1038 mm - **Thickness:** 35 mm - **Weight:** 19.5 kg - **Area:** 1.82 m2 - **Power density:** 194.9 Wp/m2 ### Warranty and degradation ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12663 of 14005 | | Power density | 12667 of 14005 | | Temperature coefficient | 13579 of 14005 | | Weight | 9311 of 14005 | | Warranty | 13880 of 14005 | ## Pros - **Half-cut technology reduces power loss** - Splitting cells into halves lowers internal resistance and reduces the hot-spot effect under partial shading, resulting in a more stable energy yield compared to classic full-cell modules in the same PERC class. - **Peak efficiency of 20.3% matches segment leaders** - The top end of the efficiency range (20.3%) matches the best-performing peer, Selfa SV120M.3.2 (20.3%), and exceeds Solitek SOLID Bifacial (19.57%), though the lower bound of 19.2% shows this figure applies only to the highest-power variants in the series. - **Compact 120-cell format** - The 120-cell layout (rather than 144 or 60) offers a favorable power-to-area ratio, making the module easier to install on residential roofs with limited available surface. - **Solid low-irradiance performance** - Monocrystalline PERC cells make more efficient use of diffuse radiation than older polycrystalline technology, which is practically relevant for Poland's autumn-winter conditions with frequent low light intensity. ## Cons - **Model discontinued from production** - According to the ENF Solar Panel Directory, the RL350-370HM-120 series is no longer actively manufactured by Ningbo Rarlon Photovoltaic Technology, implying limited unit availability, potential warranty-service gaps, and lack of replacement parts over the module's long operational life (25-30 years). - **PERC technology, not N-type TOPCon/HJT** - Unlike newer N-type cell generations (TOPCon, HJT) now offered by many Tier-1 manufacturers, PERC exhibits a higher LID degradation coefficient and weaker temperature coefficient, meaning lower annual yield in hot months at comparable nominal power. - **No confirmed BNEF Tier 1 status** - The manufacturer does not appear on BNEF Tier 1 lists for PV module suppliers, unlike the established European brands in the peer set (Solarwatt, Solitek), which may reduce lender and insurer confidence when financing commercial installations. - **No bifacial variant available** - The series is single-sided only (is\_bifacial: false), while the comparable Solitek SOLID Bifacial model at the same maximum power (370 Wp) offers additional rear-side energy gain unavailable in the RL350HM-370HM-120. ## About this series The Rarlon RL350HM-370HM-120 photovoltaic panel series is an advanced solution based on **Half-cut cell technology**, which directly translates into higher installation efficiency in challenging lighting conditions. By dividing the cells into two parts, these modules generate lower energy losses resulting from internal resistance, making them an exceptionally stable power source even under partial shading. The design using **monocrystalline PERC cells** allows for more effective use of low-intensity solar radiation, which is crucial in the Polish climate zone. This solves the problem of power drops during the autumn-winter periods, providing users with a faster return on investment. The use of **120-cell technology** guarantees an optimal balance between dimensions and power output, making installation easier on roofs with limited surface area. These panels stand out from the competition due to their high resistance to potential-induced degradation and excellent mechanical strength against snow and wind loads. It is an ideal choice for prosumers seeking **reliability and durability** at a reasonable price. This series is primarily dedicated to modern residential housing and medium-sized commercial installations, where maximizing yields from every square meter of the roof is of key importance. ## Notable figures - At 19.5% efficiency, this panel is on par with typical \*\*PERC 0-400W\*\* modules - At 194.9 W/m² power density, roof space requirements are typical for \*\*PERC 0-400W\*\* panels - At -0.39%/°C, loses 0.03pp more power per degree than \*\*PERC 0-400W\*\* median (-0.36%/°C) - Weight of 19.5 kg is typical for \*\*PERC 0-400W\*\* panels - #12663 for efficiency, #13579 for temperature performance out of 14005 panels ## Questions ### Do Rarlon RL350HM-370HM-120 panels perform better than standard modules under partial roof shading? Yes, the half-cut cell technology used in this series directly improves system performance under shading conditions. Splitting each cell in half reduces the current in every sub-string, resulting in noticeably lower resistive losses compared to conventional modules. When shade falls on part of the panel surface — from a chimney, dormer, or antenna — the module loses significantly less power than a standard 60-cell module would. ### What warranty does the Rarlon RL350HM-370HM-120 series come with? Manufacturer Ningbo Rarlon Photovoltaic Technology provides a product warranty covering manufacturing defects, along with a long-term linear power output warranty — typically 25 years with at least 80% of rated power retained. The RL350HM-370HM-120 series aligns with this standard for PERC-class modules. Exact warranty terms should be confirmed with the local distributor, as details may vary depending on the commercial agreement. ### Will the RL350HM-370HM-120 series perform well on a Polish rooftop in autumn and winter? Yes. Monocrystalline PERC cells have a favorable temperature coefficient, meaning that on cold, sunny days the modules actually achieve higher efficiency than during hot summer conditions. The half-cut cell design reduces losses in diffuse light, which is prevalent during Polish autumn and winter. Modules in this class are engineered to withstand snow load and high wind pressure, making them a solid choice for Central European climate conditions. ### How many cells does the Rarlon RL350HM-370HM-120 panel have, and does it matter for small roof installations? The series uses 120 half-cut cells — equivalent to 60 full cells split using half-cut technology. This configuration delivers an excellent power-to-size ratio: at a maximum output of 370 W, the module remains compact. That makes it easier to optimize panel placement on roofs with limited or irregular surface area, which is common in Polish single-family residential construction and mid-sized commercial installations. ### Why are the Rarlon RL350HM-370HM-120 panels not bifacial, and is it worth paying extra for a bifacial module? The RL350HM-370HM-120 series is a monofacial module with PERC cells — a proven and cost-effective design. Bifacial panels generate additional yield from light reflected off the ground, but they are most beneficial in ground-mount systems or flat-roof installations with a light-colored surface. On a typical sloped roof covered with roof tiles, the energy production difference between monofacial and bifacial is often marginal, making the RL350HM-370HM-120 a practical, cost-efficient choice. ### Are the Rarlon RL350HM-370HM-120 panels compatible with popular inverters available in Poland? Yes. The electrical parameters of this series — maximum power of 370 W and standard open-circuit voltage and MPPT voltage ranges — are compatible with inverters widely available on the Polish market, such as SMA, Fronius, Huawei SUN2000, and SolarEdge. Before purchasing, it is advisable to verify with your installer that the planned string configuration fits within the input voltage range and MPPT power rating of the selected inverter. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/370m-120-8a0bf5c50a34.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +3.6 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +3.6 pp | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | -35 W, lighter, +3.5 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -15 W, lighter, +3.5 pp | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +3.5 pp | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | +25 W, lighter, +3.5 pp | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +45 W, lighter, +3.5 pp | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | +45 W, lighter, +3.5 pp | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | +25 W, lighter, +3.5 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | +45 W, cooler, +3.1 pp | | [Rarlon PV Tech RL350HM-120](https://comparepv.com/panel/rarlon-pv-tech-rl350hm-120) | 350 W | -0.3 pp | | [Rarlon PV Tech RL360HM-120](https://comparepv.com/panel/rarlon-pv-tech-rl360hm-120) | 360 W | +0.3 pp | | [Rarlon PV Tech RL365HM-120](https://comparepv.com/panel/rarlon-pv-tech-rl365hm-120) | 365 W | +10 W, +0.5 pp | | [Rarlon PV Tech RL370HM-120](https://comparepv.com/panel/rarlon-pv-tech-rl370hm-120) | 370 W | +15 W, +0.8 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +155 W, cooler, +5.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +140 W, cooler, +5.3 pp | --- Source: https://comparepv.com/panel/rarlon-pv-tech-rl355hm-120 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.