--- title: "KDM Kingdom Solar KD-M440-108-N 440W Solar Panel - Specs & Review | ComparePV" description: "KDM Kingdom Solar KD-M440-108-N 440W solar panel. Specs: 22.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/kingdom-kd-m440-108-n" updated: 2026-09-11 --- # KDM Kingdom Solar KD-M440-108-N Space saver, no clear weak spot 321 panels in the segment N-type 400-450 W ## Identity - **Manufacturer:** KDM Kingdom Solar - **Model:** KD-M440-108-N - **Series:** KDM SERIES - **Rated power:** 440 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 400-450 W (321 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 440 W | 430 W | Strong - top 23% | | | Module efficiency | 22.50% | 21.91% | Strong - top 10% | 4,222 | | Power density | 225.3 | 218.3 | Strong - top 9% | 4,099 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 22.0 kg | 22.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.50% | 21.91% | Strong - top 10% | 4,222 | | Power density | 225.3 | 218.3 | Strong - top 9% | 4,099 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 50.0 | 51.2 | Typical | 3,317 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **225.3 watts per square metre** - Top 9% of the N-type 400-450 W segment, against a median of 218.3. Ranked 4,099th in the whole database. - **22.50% module efficiency** - Top 10% of the N-type 400-450 W segment, against a median of 21.91%. Ranked 4,222nd in the whole database. - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 440 W - **Efficiency:** 22.50 % - **Voltage at Pmax (Vmp):** 32.81 V - **Current at Pmax (Imp):** 13.41 A - **Open-circuit voltage (Voc):** 39.38 V - **Short-circuit current (Isc):** 13.86 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 22.0 kg - **Area:** 1.95 m2 - **Power density:** 225.3 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 86.4 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 380 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 4222 of 14005 | | Power density | 4099 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 3317 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type cell technology** - N-type cells exhibit significantly lower light-induced degradation (LID \<0.5%) compared to standard PERC cells (~2–3% LID), and a better temperature coefficient (typically -0.29/-0.30%/°C) translates into higher annual energy yield, especially during high-temperature summer months. - **30-year linear power warranty** - The manufacturer provides a 30-year linear power output warranty — a benchmark introduced by top N-type producers that exceeds the older 25-year PERC standard. For residential prosumer installations, this reduces investment risk throughout the full payback period. - **Half-cut cells + Multi-Busbar (MBB)** - The combination of half-cut cell design (halved internal resistance, reduced hot-spot risk) and MBB architecture (9–12 busbars) lowers power losses under partial shading conditions and reduces thermal stress responsible for micro-crack formation, extending the module's mechanical service life. - **22.5% efficiency — competitive in segment** - The 22.5% module efficiency places KDM Series on par with Seraphim Nebula (22.53%) and above Lina Energy LEPV 132 Ultra Premium (22.37%) in a direct 440 Wp peer comparison, demonstrating solid power density for a 2021 release. ## Cons - **Discontinued series** - The KDM Series is marked as discontinued (launched 2021). The lack of ongoing production makes it difficult to source identical modules for system expansion or damaged-panel replacement, and availability of original service components (junction boxes, frames) will diminish over time. - **Not BNEF Tier-1 / non-bankable** - Kingdom Solar does not appear on the BloombergNEF Tier-1 module list, which disqualifies or complicates non-recourse project financing used by banks and infrastructure funds. For commercial and utility-scale PV projects above 50 kWp, this can increase the cost of capital or require additional financial collateral. - **Product warranty only 12 years** - The product (materials & workmanship) warranty is 12 years, while comparable Tier-1 series in the same price bracket — such as Luxor Solar ECO LINE N-TYPE and Seraphim Nebula — typically offer 15 years. Any mechanical defect or delamination occurring after year 12 falls entirely on the system owner. - **Lower efficiency than segment leader** - At 22.5%, KDM Series trails the Luxor Solar ECO LINE N-TYPE TOPCON NON-REFLECT (22.86%) by 0.36 percentage points within the same 440 Wp class. For a typical 10 kWp rooftop system (~23 panels) in Polish irradiation conditions (~1,050 kWh/m²/year), this translates to approximately 38–42 kWh of lost annual generation versus the segment leader. ## About this series The KDM Kingdom Solar series features advanced modules based on **Half-Cut cell technology**, which effectively minimize internal power losses and improve efficiency in partial shading conditions. Thanks to the **Multi-Busbar (MBB) system**, these panels offer better current flow and higher resistance to micro-cracks, which directly translates into the longevity of the entire installation. These solutions address the key issue of performance degradation over time, providing users with stable energy yields even at high ambient temperatures. The design of the KDM Series modules stands out for its excellent mechanical resistance to snow and wind loads, making them an ideal choice for the demanding Polish climate. This offer is dedicated to both individual investors and commercial projects, where the priority is an **optimal price-to-quality ratio** and reliability for decades. Compared to standard solutions, this series handles diffused light much better, allowing for the maximization of energy self-consumption in buildings. The use of an **anti-reflective coating** further increases the absorption of sunlight, eliminating losses resulting from light reflection from the glass surface. This is a solid foundation for any modern solar power plant that relies on proven technologies and full investment security. ## Notable figures - 22.5% module efficiency - 0.6pp better than the \*\*N-type 400-450W\*\* median of 21.9% - 225.3 W/m² power density - 7.0 W/m² more than \*\*N-type 400-450W\*\* median (218.3 W/m²), more power per roof area - At -0.29%/°C, hot weather performance is typical for \*\*N-type 400-450W\*\* panels - Ranked #4222 out of 14005 panels for efficiency in the database ## Questions ### What cell technology does the KDM Kingdom Solar series use, and what does it mean in practice? The KDM Kingdom Solar series uses N-type half-cut cells with a Multi-Busbar (MBB) system. N-type cells offer lower light-induced degradation (LID) and better performance at elevated temperatures compared to standard P-type cells. The half-cut design reduces internal resistive losses, while MBB improves current flow and resistance to microcracks, directly extending the service life of the entire PV installation. ### How does the KDM Series handle partial shading on a rooftop? The half-cut cell technology in the KDM Series significantly limits the impact of partial shading on overall module output. Splitting cells in half means that shading one section of the panel does not cause a drastic power drop across the rest of the module. This is especially valuable on rooftops with chimneys, dormers, or nearby trees where some shading is unavoidable. ### What warranties are included with KDM Kingdom Solar series panels? The manufacturer provides a 12-year product warranty and a 30-year linear power warranty for the KDM Series. The 30-year power warranty guarantees the panels will maintain a specified minimum output level throughout that period. Keep in mind that KDM Kingdom Solar is not a Tier 1 manufacturer, which may be relevant when seeking bank financing for larger commercial projects. ### Is the KDM Series still available for purchase? The KDM Series has been discontinued and is no longer in active production. Any remaining availability is limited to existing distributor stock. If you are considering a purchase, check current inventory with your supplier or ask for a recommendation on an actively manufactured equivalent within the KDM Kingdom Solar product lineup. ### How will the KDM Series 440 Wp panel perform in cold-climate winter conditions? The KDM Series 440 Wp module is built to handle demanding weather conditions. Its robust mechanical construction withstands heavy snow loads and strong winds typical of Central European winters. N-type cells maintain better parameters at low temperatures compared to P-type PERC, and the anti-reflective coating improves light absorption under diffuse irradiance on overcast days. ### Is the KDM Series a bifacial module — is it worth installing on a ground-mount system? No, the KDM Series is a monofacial module that harvests energy exclusively from the front surface. It does not benefit from ground-reflected irradiance the way bifacial panels do, so there is no additional energy gain from a ground-mount orientation. For standard rooftop installations this is fully adequate, simpler to engineer, and compatible with conventional BoS mounting systems. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20250731134657_729-13b05149bf38.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +50 W, cooler, +2.0 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +50 W, cooler, +2.0 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +45 W, cooler, +1.8 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +45 W, cooler, +1.8 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +45 W, cooler, +1.8 pp | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | +45 W, cooler, +1.8 pp | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +45 W, cooler, +1.8 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +70 W, cooler, +2.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +55 W, cooler, +2.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +65 W, cooler, +2.2 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +60 W, cooler, +2.0 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +60 W, cooler, +2.0 pp | --- Source: https://comparepv.com/panel/kingdom-kd-m440-108-n Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.