--- title: "Sunpro Power SPDG645-BC132R12 645W Solar Panel - Specs & Review | ComparePV" description: "Sunpro Power SPDG645-BC132R12 645W solar panel. Specs: 23.88% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/sunpro-spdg645-bc132r12" updated: 2026-09-11 --- # Sunpro Power SPDG645-BC132R12 Solid all-round for its segment 72 panels in the segment Back Contact 600-650 W ## Identity - **Manufacturer:** Sunpro Power - **Model:** SPDG645-BC132R12 - **Series:** SPDG(640/665)-BC132R12 - **Rated power:** 645 W - **Cell technology:** Back Contact - **Bifacial:** yes ## How it compares Compared against segment Back Contact 600-650 W (72 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 645 W | 635 W | Strong - top 11% | | | Module efficiency | 23.88% | 23.70% | Typical | 394 | | Power density | 238.8 | 236.9 | Typical | 356 | | Temperature coefficient | -0.260 | -0.260 | Typical | 511 | | Weight (kg) | 33.5 kg | 32.3 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.88% | 23.70% | Typical | 394 | | Power density | 238.8 | 236.9 | Typical | 356 | | Temperature coefficient | -0.260 | -0.260 | Typical | 511 | | Weight per kWp | 51.9 | 50.4 | Typical | 5,361 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 23.88 % - **Voltage at Pmax (Vmp):** 40.88 V - **Current at Pmax (Imp):** 15.78 A - **Open-circuit voltage (Voc):** 49.62 V - **Short-circuit current (Isc):** 16.46 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.200 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** Back Contact - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.5 kg - **Area:** 2.70 m2 - **Power density:** 238.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 573 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 394 of 14005 | | Power density | 356 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 5361 of 14005 | | Warranty | 21 of 14005 | ## About this series The Sunpro SPDG(640/665)-BC132R12 series is a breakthrough **bifacial glass-glass** solution that combines powerful rated power with exceptional durability in harsh environmental conditions. The use of advanced large-format cell technology allows for generating significant energy yields while optimizing the structural costs of the entire installation. A key differentiator of this series is its **bifacial module activity**, enabling energy harvesting from light reflected off the ground, which directly translates into higher investment profitability compared to standard single-sided panels. The double-glass construction guarantees **maximum resistance to PID degradation** and micro-cracks, effectively eliminating typical system longevity issues in the demanding Polish climate. These panels are designed for professional photovoltaic farms and modern industrial facilities, where the key factor is maximizing yield from the available area. Thanks to **low temperature coefficients**, the devices maintain very high efficiency even during intense sunlight and summer heat. Choosing this series is a guarantee of stable energy production for decades, clearly distinguishing it from less durable solutions available on the market. It is an ideal proposition for investors focusing on **high-performance N-type technology** and long-term capital security. ## Notable figures - Efficiency of 23.9% matches the \*\*Back Contact 600-650W\*\* median - At 238.8 W/m² power density, roof space requirements are typical for \*\*Back Contact 600-650W\*\* panels - At -0.26%/°C, hot weather performance is typical for \*\*Back Contact 600-650W\*\* panels - Weight of 33.5 kg is 1.2 kg above \*\*Back Contact 600-650W\*\* median (32.3 kg) - verify structural support - In the top 3% for efficiency among all Back Contact panels ## Questions ### Is the Sunpro SPDG(640/665)-BC132R12 panel series still available for purchase? No, the SPDG(640/665)-BC132R12 series has been discontinued. Remaining warehouse stock may still be available through distributors, but Sunpro Power has replaced this line with newer models. When planning to expand an existing installation, check availability with local suppliers quickly, as remaining stock is limited and may sell out fast. ### How does Back Contact technology in this series differ from classic PERC or TOPCon panels? In Back Contact technology, all connecting elements, including busbars, are located on the rear side of the cell, leaving the front surface fully exposed to light. This eliminates shading losses caused by metallization grid lines, resulting in higher efficiency and a cleaner appearance compared to standard PERC or TOPCon panels. ### What warranty comes with the Sunpro SPDG(640/665)-BC132R12 panels? The manufacturer offers a 25-year product warranty and a 30-year power output warranty. This means that even after three decades of operation, the panel should retain a guaranteed percentage of its original rated power, a result above average for standard monocrystalline panels on the market. ### How much extra energy can you realistically gain from the bifacial design of these panels? Thanks to the glass-glass construction and bifacial cell design, the module can generate an additional 5-25% of energy from the rear side, depending on ground albedo, mounting height, and tilt angle. Best results occur over bright gravel, white roofing membrane, or snow, making this series particularly attractive for ground-mounted PV farms. ### Will the BC132R12 series perform well in hot summer climates? Yes, thanks to a low temperature coefficient, the panels' power output drops more slowly than typical modules during heat waves. This matters in summer when cell temperatures can exceed 60 degrees Celsius, causing panels with worse thermal parameters to lose as much as several percent of their output. ### Is it worth buying 665 Wp panels despite the series being discontinued? If the price is attractive and enough units are available to complete or expand an existing installation, it can still be a good decision, especially since the 665 Wp power rating and N-type Back Contact technology remain among the market's top-tier specs. However, confirm that the seller provides full warranty support despite the series no longer being in active production. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/bc-spdgxxx-bc132r12-640-665w-silver-frame-30mm-4-a6b8d20f1103.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Lighter, +1.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +35 W, lighter, +1.3 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +30 W, lighter, +1.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Lighter, +1.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, heavier, +1.0 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +25 W, lighter, +0.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +25 W, lighter, +0.9 pp | | [Sunpro Power SP600W-210R-132DS](https://comparepv.com/panel/sunpro-sp600w-210r-132ds) | 600 W | -45 W, cooler, -1.7 pp | | [Sunpro Power SP610W-210R-132DS](https://comparepv.com/panel/sunpro-sp610w-210r-132ds) | 610 W | -35 W, cooler, -1.3 pp | | [Sunpro Power SPDG620-N132R12](https://comparepv.com/panel/sunpro-spdg620-n132r12) | 620 W | -25 W, hotter, -0.9 pp | | [Sunpro Power SPDG625-N132R12](https://comparepv.com/panel/sunpro-spdg625-n132r12) | 625 W | -20 W, hotter, -0.7 pp | | [Sunpro Power SPDG630-N132R12](https://comparepv.com/panel/sunpro-spdg630-n132r12) | 630 W | -15 W, hotter, -0.6 pp | | [Sunpro Power SPDG635-N132R12](https://comparepv.com/panel/sunpro-spdg635-n132r12) | 635 W | Hotter, lighter, -0.4 pp | | [Sunpro Power SPDG640-BC132R12](https://comparepv.com/panel/sunpro-spdg640-bc132r12) | 640 W | Very close match | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +55 W, heavier, +1.1 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +25 W, lighter, +0.9 pp | --- Source: https://comparepv.com/panel/sunpro-spdg645-bc132r12 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.