--- title: "Resun Solar RS6I-420M 420W Solar Panel - Specs & Review | ComparePV" description: "Resun Solar RS6I-420M 420W solar panel. Specs: 20.87% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/resun-solar-rs6i-420m" updated: 2026-09-11 --- # Resun Solar RS6I-420M Solid all-round for its segment 6,930 panels in the 320-520 W band, all technologies ## Identity - **Manufacturer:** Resun Solar - **Model:** RS6I-420M - **Series:** RS6I-M - **Rated power:** 420 W - **Cell technology:** Monocrystalline ## How it compares Compared against 320-520 W band, all technologies (6930 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 440 W | Typical | | | Module efficiency | 20.87% | 21.50% | Typical | 10,332 | | Power density | 208.7 | 215.0 | Typical | 10,282 | | Temperature coefficient | -0.340 | -0.300 | Typical | 8,778 | | Weight (kg) | 22.5 kg | 23.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.87% | 21.50% | Typical | 10,332 | | Power density | 208.7 | 215.0 | Typical | 10,282 | | Temperature coefficient | -0.340 | -0.300 | Typical | 8,778 | | Weight per kWp | 53.6 | 53.0 | Typical | 7,586 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 20.87 % - **Voltage at Pmax (Vmp):** 40.90 V - **Current at Pmax (Imp):** 10.27 A - **Open-circuit voltage (Voc):** 50.20 V - **Short-circuit current (Isc):** 10.61 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.320 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 144 ### Physical - **Length:** 2008 mm - **Width:** 1002 mm - **Thickness:** 35 mm - **Weight:** 22.5 kg - **Area:** 2.01 m2 - **Power density:** 208.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 355 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10332 of 14005 | | Power density | 10282 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 7586 of 14005 | | Warranty | 21 of 14005 | ## About this series The RS6I-M series from Resun Solar consists of monocrystalline modules built on **half-cut** cell technology paired with a 9-busbar metallization grid, addressing one of the most common issues in PV installations: power loss caused by cell microcracks and partial shading. Splitting the cells in half and increasing the busbar count reduces internal current losses within the module and minimizes the risk of hot-spot formation, resulting in higher and more stable energy output under real-world operating conditions. The panels stand out for their **high resistance to PID**, which limits power degradation over time and keeps the levelized cost of energy (LCOE) lower throughout the module's service life. The use of tempered glass with high light transmittance delivers solid **low-light performance**, while certified resistance to salt mist and ammonia makes the series suitable for both rooftop installations and large-scale PV farms in harsh environmental conditions. An additional advantage is the **high mechanical strength** of the frame against wind and snow loads, improving installation safety. The RS6I-M series is a good fit for investors looking for proven, reliable technology at a reasonable budget, without having to reach for premium TOPCon or HJT solutions. ## Notable figures - Efficiency of 20.9% is 1.0pp below the \*\*database\*\* median (21.8%) - 208.8 W/m² power density is 9.3 W/m² below \*\*database\*\* median (218.1 W/m²) - requires larger installation area - Temperature coefficient of -0.34%/°C is 0.04pp worse than \*\*database\*\* median (-0.30%/°C) - higher losses in summer heat - Weight of 22.5 kg (4.0 kg below \*\*database\*\* median of 26.5 kg) allows easier transport and roof mounting - Ranked #10332 out of 14005 panels for efficiency in the database ## Questions ### Is the Resun Solar RS6I-M series still available for purchase? The RS6I-M series has been discontinued by Resun Solar and replaced by newer models. It can currently be purchased only from remaining distributor stock, while supplies last. It's worth checking current availability with a seller, since once existing batches sell out, no further units will be produced. ### What warranty comes with Resun Solar RS6I-M panels? The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the module should retain a guaranteed minimum generation level even after many years of use, giving installers and owners a predictable return on investment. ### How does half-cut technology in the RS6I-M differ from standard full-size cells? Half-cut technology splits cells in half, reducing internal current losses and resistance within the module. This helps the RS6I-M handle partial shading better - covering half a cell string doesn't knock out the entire row from production, unlike older full-cell designs. The 9-busbar metallization grid further reduces microcrack risk and improves long-term power stability. ### Are RS6I-M panels suitable for harsh environments, such as coastal installations? Yes, the RS6I-M series is certified for resistance to salt mist and ammonia corrosion, making it suitable for coastal installations and agricultural sites exposed to nitrogen compounds. High PID resistance further limits power degradation caused by leakage current, which is common in humid and salty environments. ### What is the maximum power output of the RS6I-M, and is that competitive for a monocrystalline panel? RS6I-M modules reach up to 420 Wp of maximum power. This is a solid result within the standard monocrystalline PERC half-cut segment, though lower than the latest TOPCon or HJT modules. For a typical rooftop installation, this offers a good power-to-area ratio at a reasonable purchase price. ### Is it worth choosing RS6I-M over more expensive TOPCon or HJT panels? RS6I-M is a proven, budget-conscious choice for investors who want reliability without paying premium prices - its high PID resistance and solid power warranty ensure stable performance over the years. TOPCon or HJT panels offer higher efficiency and better high-temperature performance, but at a higher cost. RS6I-M is a good fit where investment cost matters more than maximum output per square meter. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/RS6I-M-390-420W-min-61c83940f2b6.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, cooler, +2.9 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.9 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | Cooler, +2.8 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.7 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, cooler, +2.7 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.7 pp | | [Resun Solar RS6I-390M](https://comparepv.com/panel/resun-solar-rs6i-390m) | 390 W | -30 W, -1.5 pp | | [Resun Solar RS6I-395M](https://comparepv.com/panel/resun-solar-rs6i-395m) | 395 W | -25 W, -1.2 pp | | [Resun Solar RS6I-400M](https://comparepv.com/panel/resun-solar-rs6i-400m) | 400 W | -20 W, -1.0 pp | | [Resun Solar RS6I-405M](https://comparepv.com/panel/resun-solar-rs6i-405m) | 405 W | -15 W, -0.7 pp | | [Resun Solar RS6I-410M](https://comparepv.com/panel/resun-solar-rs6i-410m) | 410 W | -10 W, -0.5 pp | | [Resun Solar RS6I-415M](https://comparepv.com/panel/resun-solar-rs6i-415m) | 415 W | -0.2 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | Cooler, +3.1 pp, +10 yr warranty | | [Maxeon SPR-MAX7-465](https://comparepv.com/panel/maxeon-spr-max7-465) | 465 W | Cooler, +2.6 pp, +10 yr warranty | | [MY Solar MS480NC-HJTPBFT](https://comparepv.com/panel/my-solar-ms480nc-hjtpbft) | 480 W | +60 W, cooler, +1.2 pp | | [LG LG440QAC-A6](https://comparepv.com/panel/lg-lg440qac-a6) | 440 W | Cooler, +1.2 pp, -5 yr warranty | --- Source: https://comparepv.com/panel/resun-solar-rs6i-420m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.