--- title: "Sunpro Power SPDG660-N120M12 660W Solar Panel - Specs & Review | ComparePV" description: "Sunpro Power SPDG660-N120M12 660W solar panel. Specs: 23.32% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/sunpro-spdg660-n120m12" updated: 2026-09-11 --- # Sunpro Power SPDG660-N120M12 Solid all-round for its segment 249 panels in the segment TOPCon 650-700 W ## Identity - **Manufacturer:** Sunpro Power - **Model:** SPDG660-N120M12 - **Series:** TOPCon 210 BIFACIAL (SPDG 645-660W)-N120M12 - **Rated power:** 660 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 650-700 W (249 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 665 W | Typical | | | Module efficiency | 23.32% | 22.40% | Typical | 973 | | Power density | 233.2 | 223.7 | Typical | 1,089 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 34.2 kg | 34.6 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.32% | 22.40% | Typical | 973 | | Power density | 233.2 | 223.7 | Typical | 1,089 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 51.8 | 53.2 | Typical | 5,211 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 23.32 % - **Voltage at Pmax (Vmp):** 37.70 V - **Current at Pmax (Imp):** 17.51 A - **Open-circuit voltage (Voc):** 44.75 V - **Short-circuit current (Isc):** 18.54 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/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:** TOPCon - **Cell count:** 120 - **Bifacial:** yes - **Bifacial gain:** 15.00 ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 34.2 kg - **Area:** 2.83 m2 - **Power density:** 233.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 577 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 973 of 14005 | | Power density | 1089 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 5211 of 14005 | | Warranty | 21 of 14005 | ## About this series The Sunpro TOPCon 210 BIFACIAL (SPDG 645-660W)-N120M12 series is designed for maximum energy yield from the same surface area - without compromising durability. The use of **TOPCon** cells ensures stable operation in real-world conditions and better light utilization even with less-than-ideal sunlight, which is important in the Polish climate. A key advantage is the **bifacial** design, which allows for the recovery of additional energy from reflections off the ground - particularly on roofs with light-colored membranes, carport structures, and ground-mounted systems with sufficient clearance. Modules in a 210 mm format are a good choice where high power output and faster assembly of larger systems are important. In practice, this series solves the problem of limited space, helping to increase yield without adding additional rows. With **double glass**, you gain higher resistance to weather conditions and greater safety in commercial and farm installations. This is a proposal for investors seeking predictable production and a long lifespan for their installations. ## Notable figures - 23.3% module efficiency - 0.9pp better than the \*\*TOPCon 650-700W\*\* median of 22.4% - Power density of 233.2 W/m² packs 9.5 W/m² more into the same footprint vs \*\*TOPCon 650-700W\*\* median (223.7 W/m²) - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 650-700W\*\* panels - In the top 7% for efficiency among all TOPCon panels ## Questions ### Is the Sunpro TOPCon 210 BIFACIAL (SPDG 645-660W)-N120M12 series still available for purchase? No, this series has been discontinued by Sunpro Power and is no longer in production. Some units may still be available as remaining stock through distributors, but availability is limited. Anyone planning a new installation or expansion using these panels should check current stock with a local distributor or consider the manufacturer's current equivalent models. ### How much extra power does bifacial technology actually add on Sunpro N120M12 panels? The additional rear-side yield of a bifacial module depends on the installation environment. On roofs with a light-colored membrane, white gravel, or ground-mount systems with sufficient clearance, gains of a few up to around ten percent over an equivalent monofacial 660 Wp panel are possible. On dark sloped roofs the effect is minimal, which is why bifacial panels are best suited for solar farms and carports. ### How does TOPCon cell technology in Sunpro panels differ from classic PERC cells? The TOPCon cells used in this series have an additional passivating layer on the rear side of the silicon, which reduces current losses and increases efficiency compared to older PERC cells. In practice this results in higher single-panel power output (up to 660 Wp), better performance under diffuse light, and a smaller efficiency drop at high temperatures, which matters during Polish summers. ### What is the warranty on Sunpro TOPCon 210 BIFACIAL N120M12 panels? Sunpro Power provides a 25-year product warranty and a 30-year power output warranty. This means that even after three decades of operation, the panel should still generate the guaranteed percentage of its initial rated power as specified in the datasheet, which is standard practice for Tier 1 manufacturers. ### Are double-glass N120M12 panels suitable for a sloped residential roof? The double-glass construction performs well on sloped roofs, offering higher resistance to hail, moisture, and mechanical damage than panels with a rear backsheet. However, these modules are heavier than standard backsheet panels, so roof load capacity should be verified beforehand and an appropriate mounting system selected. ### Is Sunpro Power a Tier 1 manufacturer, and is it worth buying panels made in China? Yes, Sunpro Power is classified as Tier 1, indicating stable financials and confirmed production scale, which lowers the risk of future warranty claim issues. The company is headquartered in China, which is standard for most global PV manufacturers, including many brands considered market leaders. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/topcon-spdgxxx-n120m12-645-660w-35mm-cfea9db901e5.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +40 W, cooler, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +35 W, cooler, +1.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +1.5 pp | | [Sunpro Power SPDG645-N120M12](https://comparepv.com/panel/sunpro-spdg645-n120m12) | 645 W | -15 W, -0.5 pp | | [Sunpro Power SPDG650-N120M12](https://comparepv.com/panel/sunpro-spdg650-n120m12) | 650 W | -10 W, -0.4 pp | | [Sunpro Power SPDG655-N120M12](https://comparepv.com/panel/sunpro-spdg655-n120m12) | 655 W | Very close match | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | Hotter, lighter, +0.7 pp | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | Hotter, lighter, +0.5 pp | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | Cooler, heavier, +0.4 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | Hotter, lighter, +0.4 pp | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | Cooler, heavier | | [Gamko New Energy GKA210N120-665](https://comparepv.com/panel/gamko-new-energy-gka210n120-665) | 665 W | Hotter, lighter | --- Source: https://comparepv.com/panel/sunpro-spdg660-n120m12 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.