--- title: "Phono Solar PS420M8GF-18/VH Solar Panel: Specs & Datasheet | ComparePV" description: "Phono Solar PS420M8GF-18/VH solar panel. Specs: 21.51% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/phono-solar-ps420m8gf-18-vh" image: "https://comparepv.com/og/panel/phono-solar-ps420m8gf-18-vh.png" updated: 2026-09-11 --- # Phono Solar PS420M8GF-18/VH Efficiency leader, no clear weak spot 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Phono Solar - **Model:** PS420M8GF-18/VH - **Series:** Bifacial Twinplus / HIGH EFFICIENCY MONO-PERC BM6-10B-G (400–420W) - **Rated power:** 420 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 410 W | Typical | | | Module efficiency | 21.51% | 20.60% | Strong - top 3% | 7,958 | | Power density | 215.1 | 206.2 | Strong - top 3% | 7,946 | | Temperature coefficient | -0.330 | -0.350 | Strong - top 10% | 8,613 | | Weight (kg) | 21.0 kg | 22.0 kg | Strong - top 17% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.51% | 20.60% | Strong - top 3% | 7,958 | | Power density | 215.1 | 206.2 | Strong - top 3% | 7,946 | | Temperature coefficient | -0.330 | -0.350 | Strong - top 10% | 8,613 | | Weight per kWp | 50.0 | 53.0 | Strong - top 17% | 3,329 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Strengths - **21.51% module efficiency** - Top 3% of the PERC 400-450 W segment, against a median of 20.60%. Ranked 7,958th in the whole database. - **215.1 watts per square metre** - Top 3% of the PERC 400-450 W segment, against a median of 206.2. Ranked 7,946th in the whole database. - **-0.330 %/°C temperature coefficient** - Top 10% of the PERC 400-450 W segment, against a median of -0.350. - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.51 % - **Voltage at Pmax (Vmp):** 31.37 V - **Current at Pmax (Imp):** 13.39 A - **Open-circuit voltage (Voc):** 37.54 V - **Short-circuit current (Isc):** 14.12 A ### Temperature - **Temperature coefficient of Pmax:** -0.330 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.042 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 108 - **Bifacial:** yes ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.0 kg - **Area:** 1.95 m2 - **Power density:** 215.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 357 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7958 of 14129 | | Power density | 7946 of 14129 | | Temperature coefficient | 8613 of 14129 | | Weight | 3329 of 14129 | | Warranty | 21 of 14129 | ## Pros - **Bifacial design with dual-glass build** - Bifacial PERC cells in a dual-glass housing capture reflected albedo light, delivering a real yield gain over monofacial modules on light-colored roofs, membranes, or ground-mount systems. The dual-glass construction also improves mechanical rigidity and long-term degradation resistance. - **Half-cut PERC reduces losses** - Half-cut cell technology combined with mono PERC lowers resistive losses and improves shading tolerance, which matters on roofs with obstructions such as chimneys or vents and in installations with irregular geometry. - **Tier-1 BNEF status and PVEL top ranking** - Phono Solar has held Tier 1 status on the Bloomberg NEF list continuously since 2014, and in 2025 its modules were named a Top Performer in Kiwa PVEL's PV Module Reliability Scorecard. The manufacturer is backed by the Sumec/Sinomach group, a Fortune Global 500 company, supporting strong project bankability. - **30-year linear power warranty** - The linear power warranty covers 30 years, exceeding the typical 25-year industry standard for PERC modules. This extra 5-year horizon gives investors longer certainty on energy yield without added cost. - **Efficiency at the top of the PERC segment** - Efficiency up to 21.51% is on par with competing mono PERC series such as GCL-M10/54H (21.5%) and RedSolar P series M10-PERC Ultralight (21.52%), placing the series among the leaders of this cell generation. ## Cons - **Production discontinued (2025)** - The series launched in 2021 and was discontinued in 2025. This limits the availability of replacement units for damaged panels within an installation and may complicate servicing over the 30-year power warranty period. - **PERC trails newer N-type cells** - Efficiency up to 21.51% is lower than the competing Jinko JS-PERC SERIES (21.7%) and noticeably behind next-generation TOPCon/HJT modules reaching 22-23%+. PERC technology is approaching its physical efficiency ceiling, making this series a less future-proof choice where roof area is constrained. ## About this series The Phono Solar Bifacial Twinplus / HIGH EFFICIENCY MONO-PERC BM6-10B-G (400-420W) series was designed with the goal of maximizing energy gains anywhere square meterage matters. Its key advantage is the **bifacial construction**, which allows utilizing reflected light from the ground-truly supporting higher energy production compared to traditional monofacial panels, especially on light-colored roofs, ground, membranes, and east-west installations. The application of **mono PERC cells** combined with **half-cut technology** helps minimize module losses and improves performance under partial shading. This is an excellent choice for rooftops with obstructions (chimneys, vents) and for installations operating under variable lighting conditions. Against many competitive solutions, the series also stands out for its **PID resistance** and **dual glass**, translating to stable parameters and greater operational certainty in the long term. Ideal for homes, businesses, and commercial projects where high energy output from the same surface area is a priority. ## Notable figures - At 21.5% efficiency, this panel is 0.9pp above typical \*\*PERC 400-450W\*\* modules (median: 20.6%) - At 215.1 W/m² power density, this panel generates 8.9 W/m² more per unit area than \*\*PERC 400-450W\*\* median (206.2 W/m²) - At -0.33%/°C, hot weather performance is typical for \*\*PERC 400-450W\*\* panels - At 21.0 kg, weight matches the \*\*PERC 400-450W\*\* median - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### Is the Phono Solar Bifacial Twinplus BM6-10B-G series still available for purchase? The BM6-10B-G series has been discontinued and is no longer actively offered by Phono Solar. The manufacturer has transitioned to updated TwinPlus lines such as the TwinPlus X. Some distributors may still carry stock, but for new installations a currently produced replacement model is generally recommended. ### What warranty does Phono Solar offer on the BM6-10B-G panels? Phono Solar provides a 12-year product warranty covering manufacturing defects and mechanical damage, plus a 30-year linear power warranty. After 30 years, the module is guaranteed to retain at least approximately 84.95% of its rated output. This is one of the longer power warranty periods available for PERC-based modules. ### What real-world benefit does bifacial technology provide in the BM6-10B-G series? Bifacial modules harvest light on both the front and rear surfaces, capturing albedo - radiation reflected from the ground or roof substrate. On bright surfaces such as white TPO membranes, gravel, or light-colored concrete, the rear-side energy gain typically ranges from a few percent to over 20%. The effect is maximized with adequate clearance beneath the modules and a highly reflective background. ### Are Phono Solar BM6-10B-G panels suitable for roofs with chimneys or vents? Yes. The half-cut cell layout (108 cells) splits the module into two independent electrical circuits, so partial shading from a chimney or vent causes a smaller power drop than in a standard 60-cell panel. Mono PERC cell technology also improves performance under diffuse light conditions, which are common on partially shaded rooftops or overcast days. ### Why does the BM6-10B-G series use dual glass instead of a standard backsheet? The glass-glass construction offers superior resistance to moisture ingress, UV exposure, and mechanical stress compared to conventional polymer backsheets. Dual-glass modules also exhibit lower LID and PID-related degradation, resulting in more stable output over the full system lifetime. They are particularly well-suited for ground-mount systems, commercial installations, and high-humidity climates. ### What is the actual efficiency of the Phono Solar BM6-10B-G modules and how much energy can I expect? The BM6-10B-G series is rated at 400 to 420 W under Standard Test Conditions (STC). The 420 W variant typically delivers module efficiency in the 20-21% range, which is above average for PERC modules of this generation. Real-world output depends on tilt angle, azimuth orientation, shading, and module operating temperature. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/gl-en-bifacial-twinplus-182-108-10bb-f9a7d3dea72e.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, +2.3 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.3 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | Cooler, +2.2 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.1 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, +2.1 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.1 pp | | [Phono Solar PS400M8GF-18/VH](https://comparepv.com/panel/phono-solar-ps400m8gf-18-vh) | 400 W | -20 W, -1.0 pp | | [Phono Solar PS405M8GF-18/VH](https://comparepv.com/panel/phono-solar-ps405m8gf-18-vh) | 405 W | -15 W, -0.8 pp | | [Phono Solar PS410M8GF-18/VH](https://comparepv.com/panel/phono-solar-ps410m8gf-18-vh) | 410 W | -10 W, -0.5 pp | | [Phono Solar PS415M8GF-18/VH](https://comparepv.com/panel/phono-solar-ps415m8gf-18-vh) | 415 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.2 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, cooler, +3.0 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +80 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/phono-solar-ps420m8gf-18-vh Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.