--- title: "MWG MWG-400M 400W Solar Panel - Specs & Review | ComparePV" description: "MWG MWG-400M 400W solar panel. Specs: 19.32% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/mwg-mwg-400m" updated: 2026-09-11 --- # MWG MWG-400M Middle of its segment, weak in heat 6,519 panels in the 300-500 W band, all technologies ## Identity - **Manufacturer:** MWG - **Model:** MWG-400M - **Series:** MWG Mono - **Rated power:** 400 W - **Cell technology:** Monocrystalline ## How it compares Compared against 300-500 W band, all technologies (6519 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 24% | | | Module efficiency | 19.32% | 21.30% | Weak - bottom 11% | 12,790 | | Power density | 197.6 | 212.6 | Weak - bottom 16% | 12,443 | | Temperature coefficient | -0.390 | -0.300 | Weak - bottom 2% | 13,579 | | Weight (kg) | 24.0 kg | 22.5 kg | Weak - bottom 15% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 19.32% | 21.30% | Weak - bottom 11% | 12,790 | | Power density | 197.6 | 212.6 | Weak - bottom 16% | 12,443 | | Temperature coefficient | -0.390 | -0.300 | Weak - bottom 2% | 13,579 | | Weight per kWp | 60.0 | 53.2 | Weak - bottom 15% | 12,326 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Watch out for - **-0.390 %/°C temperature coefficient** - Bottom 2% of the 300-500 W band, against a median of -0.300. Ranked 13,579th in the whole database. - **19.32% module efficiency** - Bottom 11% of the 300-500 W band, against a median of 21.30%. - **60.0 kg per kWp** - Bottom 15% of the 300-500 W band, against a median of 53.2. - **Best for:** Off-grid and residential. - **Not ideal for:** Hot climates, tight roof space and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 19.32 % - **Voltage at Pmax (Vmp):** 41.33 V - **Current at Pmax (Imp):** 9.68 A - **Open-circuit voltage (Voc):** 49.97 V - **Short-circuit current (Isc):** 10.25 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.390 %/degC - **Temperature coefficient of Voc:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 47 degC ### Cell and construction - **Cell type:** Monocrystalline ### Physical - **Length:** 2020 mm - **Width:** 1002 mm - **Thickness:** 40 mm - **Weight:** 24.0 kg - **Area:** 2.02 m2 - **Power density:** 197.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 10 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 80.0 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.70 % - **Output after 30 years:** 309 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12790 of 14005 | | Power density | 12443 of 14005 | | Temperature coefficient | 13579 of 14005 | | Weight | 12326 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Robust mechanical build** - Low-iron, UV-resistant tempered glass combined with an anodized aluminum alloy frame delivers strong mechanical durability and limits cell degradation from solar exposure, which matters for installations facing harsh weather conditions. - **Extensive 25-year warranty package** - The 25-year power warranty guaranteeing at least 90% output through the first decade and 80% thereafter is comparable to Tier-1 manufacturer offerings, and is further backed by IEC, TUV, and CE certifications. - **MPPT-friendly installation flexibility** - Full compatibility with MPPT charge controllers plus support for series and parallel wiring makes this series convenient for designing off-grid systems, mini power plants, and electronics power supplies. - **Competitive monocrystalline efficiency** - Efficiency of 19.32-20.12% clearly outperforms the comparable DMEGC GH400M10T-B48HST (15.48%) and sits close to the Heliene 108HC M10 SL All Black (20.5%) at the same 400 Wp maximum power. ## Cons - **Series discontinued** - MWG Mono has been discontinued, meaning limited availability of warranty service, spare parts, and difficulty sourcing matching modules to extend existing installations in the future. - **Not a Tier-1 (BNEF) manufacturer** - MW Green Power does not appear on BloombergNEF's Tier-1 bankable manufacturer list, unlike comparable brands such as Heliene or Meyer Burger, which can complicate bank financing for larger commercial projects. - **Short product warranty on base variant** - Product warranty ranges from 5 to 10 years depending on the variant - the 5-year lower bound is clearly below the current market standard for mono modules, where premium manufacturers typically offer 10-15 years on manufacturing defects. - **Efficiency below premium HJT segment** - Maximum efficiency of 20.12% trails heterojunction-based modules such as the Meyer Burger White (21.7% at the same 400 Wp power), translating to lower energy yield for a comparable installation area. ## About this series The **MWG Mono** series by MW Green Power comprises photovoltaic modules built on a **monocrystalline structure**, distinguished by high long-term stability and robust construction suited for both stationary and off-grid installations. The **low-iron, UV-resistant tempered glass** effectively protects the cells against degradation caused by solar radiation and adverse weather conditions, directly translating into the durability of the entire installation. The modules are covered by an extensive warranty package - **5/10/25-year warranty** - guaranteeing at least 90% power retention during the first decade and 80% over the following years of operation. The frame, made of **anodized aluminum alloy**, facilitates installation and ensures mechanical resistance even under demanding conditions. The series works excellently with MPPT charge controllers, enabling maximum utilization of available solar energy. The ability to connect modules in series and parallel gives installers considerable design flexibility. This solution is aimed primarily at off-grid power systems, mini power plants, and power supply for electronic systems - applications where reliability and proven quality, backed by IEC, TUV, and CE certifications, are essential. ## Notable figures - At 19.3% efficiency, this panel is 2.5pp below the \*\*database\*\* median of 21.8% - 197.6 W/m² power density is 20.5 W/m² below \*\*database\*\* median (218.1 W/m²) - requires larger installation area - At -0.39%/°C, loses 0.09pp more power per degree than \*\*database\*\* median (-0.30%/°C) - At 24.0 kg, this panel is 2.5 kg lighter than \*\*database\*\* median (26.5 kg) - easier handling during installation - In the top 91% for efficiency among all N-type panels ## Questions ### Is the MWG Mono series still available for purchase? The MWG Mono series by MW Green Power has been discontinued and is no longer actively sold through standard distribution channels. If you need to expand an existing installation or are looking for a replacement, we recommend contacting a distributor directly to check remaining stock or to identify a suitable alternative from the manufacturer's current lineup. ### What warranty does the MWG Mono panel come with, and what does it cover? MWG Mono modules carry a 10-year product warranty and a 25-year linear power output warranty. The manufacturer guarantees at least 90% of rated power during the first decade of operation, and no less than 80% in subsequent years. This is a competitive warranty package for monocrystalline modules in this class, backed by IEC, TUV, and CE certifications. ### What systems are MWG Mono 400 Wp panels best suited for? MWG Mono modules are designed primarily for off-grid autonomous power systems, small-scale PV plants, and installations powering electronic equipment or industrial devices. Their compatibility with MPPT charge controllers ensures maximum energy harvest, making them a practical choice wherever grid access is limited or unavailable. ### Do MWG Mono panels feature UV-resistant glass, and does it really affect long-term durability? Yes, MWG Mono modules use low-iron tempered glass with a UV-resistant coating. This construction significantly reduces cell degradation caused by prolonged solar exposure and harsh weather conditions. In practice, it results in a slower efficiency decline and a longer service life compared to modules using standard glass without a UV barrier. ### Can MWG Mono panels be connected in series and parallel configurations when designing an installation? Yes, the MWG Mono series supports both series connections to increase string voltage and parallel connections to increase current. This gives installers considerable design flexibility when building systems of varying power and configuration. Panel count should always be matched to the voltage and current operating range of the MPPT controller or inverter used. ### How do MWG Mono monocrystalline modules differ from polycrystalline panels? The MWG Mono series uses a monocrystalline cell structure, which delivers higher efficiency and better long-term stability compared to polycrystalline cells. Monocrystalline cells produce more power per unit area, which matters when mounting space is limited. Overall build quality is confirmed by IEC, TUV, and CE certifications covering the entire series. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/MWG-400M-spec_PL-R2-52afd1688069.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | Cooler, +3.8 pp, +5 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, cooler, +3.7 pp | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, cooler, +3.7 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, cooler, +3.7 pp | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, cooler, +3.7 pp | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +3.7 pp | | [MY Solar MS480NC-HJTPBFT](https://comparepv.com/panel/my-solar-ms480nc-hjtpbft) | 480 W | +80 W, cooler, +2.8 pp | | [MY Solar MS475NC-HJTPBFT](https://comparepv.com/panel/my-solar-ms475nc-hjtpbft) | 475 W | +75 W, cooler, +2.6 pp | | [Lexron 430W](https://comparepv.com/panel/lexron-430w) | 430 W | Cooler, +2.3 pp, +5 yr warranty | | [MY Solar MS470NC-HJTPBFT](https://comparepv.com/panel/my-solar-ms470nc-hjtpbft) | 470 W | +70 W, cooler, +2.3 pp | | [Longi Solar LR4-72HPH-465M](https://comparepv.com/panel/longi-lr4-72hph-465m) | 465 W | +65 W, cooler, +2.1 pp | | [MY Solar MS465NC-HJTPBFT](https://comparepv.com/panel/my-solar-ms465nc-hjtpbft) | 465 W | +65 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/mwg-mwg-400m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.