--- title: "MY Solar MS400N-HJTPB 400W Solar Panel - Specs & Review | ComparePV" description: "MY Solar MS400N-HJTPB 400W solar panel. Specs: 12.88% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/my-solar-ms400n-hjtpb" updated: 2026-09-11 --- # MY Solar MS400N-HJTPB Middle of its segment, modest efficiency 113 panels in the segment HJT 400-450 W ## Identity - **Manufacturer:** MY Solar - **Model:** MS400N-HJTPB - **Series:** HJT BIFACIAL BIPV - **Rated power:** 400 W - **Cell technology:** HJT - **Bifacial:** yes ## How it compares Compared against segment HJT 400-450 W (113 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 4% | | | Module efficiency | 12.88% | 22.20% | Weak - bottom 1% | 13,974 | | Power density | 128.8 | 221.6 | Weak - bottom 1% | 13,958 | | Temperature coefficient | -0.260 | -0.240 | Weak - bottom 23% | 511 | | Weight (kg) | 33.8 kg | 23.0 kg | Weak - bottom 1% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 12.88% | 22.20% | Weak - bottom 1% | 13,974 | | Power density | 128.8 | 221.6 | Weak - bottom 1% | 13,958 | | Temperature coefficient | -0.260 | -0.240 | Weak - bottom 23% | 511 | | Weight per kWp | 84.5 | 52.4 | Weak - bottom 1% | 13,819 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **12.88% module efficiency** - Bottom 1% of the HJT 400-450 W segment, against a median of 22.20%. Ranked 13,974th in the whole database. - **128.8 watts per square metre** - Bottom 1% of the HJT 400-450 W segment, against a median of 221.6. Ranked 13,958th in the whole database. - **84.5 kg per kWp** - Bottom 1% of the HJT 400-450 W segment, against a median of 52.4. Ranked 13,819th in the whole database. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 12.88 % - **Voltage at Pmax (Vmp):** 24.25 V - **Current at Pmax (Imp):** 16.49 A - **Open-circuit voltage (Voc):** 29.46 V - **Short-circuit current (Isc):** 17.21 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT - **Cell count:** 80 - **Bifacial:** yes - **Bifacial gain:** 25.50 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 33.8 kg - **Area:** 3.11 m2 - **Power density:** 128.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 91.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.25 % - **Output after 30 years:** 367 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13974 of 14005 | | Power density | 13958 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 13819 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type HJT technology, no LID degradation** - N-type HJT cells lack boron-oxygen bonds, eliminating light-induced degradation (LID) and limiting annual power degradation to approximately 0.25-0.35%, versus 0.5-0.8% for standard PERC cells. - **Lowest temperature coefficient on the market** - A power temperature coefficient of around -0.24%/°C, typical for HJT, is markedly lower than the -0.35% to -0.40%/°C seen in PERC panels (including peer comparables GCL, RedSolar, Jinko), translating into higher yields on hot days. - **Extremely high bifaciality >90%** - A bifaciality factor above 90% is significantly higher than the typical 70-85% found in standard bifacial modules, meaningfully increasing rear-side energy generation over bright, reflective ground surfaces. - **30-year product and power warranty** - The 30-year product and power warranty exceeds the market-standard 25 years typical of Tier-1 PERC/TOPCon modules, reflecting manufacturer confidence in the durability of the glass-glass HJT construction. ## Cons - **Module efficiency well below peers** - Efficiency of 12.88-13.52% is roughly 37-40% lower than comparable PERC modules (GCL, RedSolar, Jinko Solar) achieving 21.5-21.7% at the same 420 Wp power rating. Matching that output requires up to ~60% more panel area, undermining cost-effectiveness on space-constrained roofs. - **Manufacturer not on Tier-1 list** - Per the manufacturer\_info field, MY Solar does not appear on the Tier-1 Bankable manufacturer list, which may complicate project bank financing or insurance requirements versus comparable offerings from Jinko Solar or GCL. ## About this series The MY Solar HJT BIFACIAL BIPV solar panel series is a technological breakthrough that combines the highest efficiency of heterojunction cells with the aesthetics of building-integrated photovoltaics. Thanks to the use of N-type HJT cells, these modules completely eliminate negative light- and voltage-induced degradation phenomena, guaranteeing stable energy yields for decades. A key distinguishing feature is **extremely high bifaciality** exceeding 90%, which allows for generating additional power from the rear of the module, making it unrivaled in installations on light surfaces. The glass-glass construction provides not only **increased mechanical resistance** and fire safety, but also an elegant, modern appearance, ideal for applications such as building facades, terrace roofs, or carports. This series offers **excellent low-light performance** and the lowest temperature coefficient on the market, allowing the system to produce more energy on hot days compared to standard technologies. This is a product dedicated to investors whose priority is **maximizing profitability from limited surface area** while maintaining the highest architectural standards. By choosing this solution, you gain a unique combination of industrial durability and uncompromising efficiency that sets your installation apart from typical market solutions. It is an **investment in future technology** that redefines reliability standards in the Polish climate. ## Notable figures - Efficiency of 12.9% is 9.3pp below the \*\*HJT 400-450W\*\* median (22.2%) - At 128.8 W/m², this panel generates 92.8 W/m² less per unit area than \*\*HJT 400-450W\*\* median (221.6 W/m²) - -0.26%/°C temperature coefficient - 0.02pp worse than \*\*HJT 400-450W\*\* median (-0.24%/°C), expect higher hot weather losses - At 33.8 kg (10.8 kg above \*\*HJT 400-450W\*\* median of 23.0 kg), requires checking roof load capacity - Bifaciality factor of 95% can add 5-14% extra yield with reflective mounting surface ## Questions ### What warranty does the MY Solar HJT BIFACIAL BIPV series come with and what does it cover? The MY Solar HJT BIFACIAL BIPV series comes with a 30-year product warranty and a 30-year power output warranty. This means the manufacturer guarantees both the physical integrity of the module and the maintenance of its rated performance for three decades. Such an extended warranty is made possible by the durable glass-glass construction and N-type HJT cell technology, which eliminates LID and LETID degradation mechanisms common in conventional PERC modules. ### Are MY Solar HJT BIFACIAL BIPV panels suitable for building facades or carport installations? Yes, the HJT BIFACIAL BIPV series was specifically engineered for building-integrated photovoltaics (BIPV) applications. The glass-glass frameless construction gives the modules a clean, modern aesthetic that integrates well into building facades, terrace canopies, and carport structures. The absence of a plastic backsheet improves fire safety ratings, and the tempered glass layers provide the mechanical strength required for structural applications in architectural projects. ### What does bifaciality above 90% mean for MY Solar HJT BIFACIAL panels and how much extra energy does it actually produce? A bifaciality factor above 90% means the rear side of the module generates over 90% of the power produced by the front side under identical irradiance conditions. In real-world installations over light-colored surfaces — white gravel, pale concrete, or snow — this translates to a 10–25% increase in energy yield compared to a standard monofacial panel. This is among the highest bifaciality ratings available on the market for HJT technology, making it exceptionally competitive in ground-mounted and carport systems. ### Do MY Solar HJT 420 Wp panels perform well during summer when temperatures exceed 35°C? Yes. HJT technology features one of the lowest power temperature coefficients available, typically around -0.24 to -0.26%/°C. By comparison, standard PERC cells have a coefficient of approximately -0.35%/°C. This means that at 35°C an HJT module loses significantly less output than conventional panels, resulting in measurably higher energy yields on hot summer days — an important advantage in the Polish climate where summer heat waves are increasingly common. ### How do MY Solar HJT BIFACIAL BIPV panels compare to popular N-type TOPCon modules and which should I choose? Both technologies use N-type silicon and eliminate LID degradation, but HJT offers a lower temperature coefficient, higher bifaciality (above 90% vs. 70–85% for TOPCon), and better low-light performance. TOPCon modules are generally less expensive and more widely available from established Tier 1 manufacturers. The MY Solar HJT BIFACIAL BIPV series is the better choice for investors who prioritize maximum energy yield per square meter and architectural integration, and for whom LCOE over 30 years outweighs the higher initial cost per watt. ### Is a 420 Wp output from MY Solar HJT BIFACIAL BIPV panels sufficient for a typical residential rooftop installation? A 420 Wp module is a high-output unit well suited for residential pitched roofs. For a typical single-family home with an annual consumption of 4,000–5,000 kWh, approximately 10–14 panels are required depending on roof orientation and tilt angle. The high cell efficiency of HJT technology means this power is achieved in a smaller footprint than equivalent PERC modules, which is a key advantage on roofs with limited usable area or obstructions such as chimneys and roof windows. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/mysolar-gold-hjt-bifacial-agri-210mm-202202-2384x1303x35-288c3c8d685b.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 | +40 W, lighter, +10.2 pp | | [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, lighter, +10.2 pp | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, lighter, +10.2 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, lighter, +10.2 pp | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, lighter, +10.2 pp | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, lighter, +10.2 pp | | [MY Solar MS405N-HJTPB](https://comparepv.com/panel/my-solar-ms405n-hjtpb) | 405 W | Very close match | | [MY Solar MS410N-HJTPB](https://comparepv.com/panel/my-solar-ms410n-hjtpb) | 410 W | +10 W, +0.3 pp | | [MY Solar MS415N-HJTPB](https://comparepv.com/panel/my-solar-ms415n-hjtpb) | 415 W | +15 W, +0.5 pp | | [MY Solar MS420N-HJTPB](https://comparepv.com/panel/my-solar-ms420n-hjtpb) | 420 W | +20 W, +0.6 pp | | [MY Solar MS680N-DHBG](https://comparepv.com/panel/my-solar-ms680n-dhbg) | 680 W | +280 W, heavier, +9.0 pp | | [MY Solar MS685N-DHBG](https://comparepv.com/panel/my-solar-ms685n-dhbg) | 685 W | +285 W, heavier, +9.2 pp | | [MY Solar MS690N-DHBG](https://comparepv.com/panel/my-solar-ms690n-dhbg) | 690 W | +290 W, heavier, +9.3 pp | | [MY Solar MS695N-DHBG](https://comparepv.com/panel/my-solar-ms695n-dhbg) | 695 W | +295 W, heavier, +9.5 pp | | [MY Solar MS700N-DHBG](https://comparepv.com/panel/my-solar-ms700n-dhbg) | 700 W | +300 W, heavier, +9.7 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +405 W, heavier, +12.2 pp | --- Source: https://comparepv.com/panel/my-solar-ms400n-hjtpb 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.