--- title: "Mission Solar MST12665HP3G 665W Solar Panel - Specs & Review | ComparePV" description: "Mission Solar MST12665HP3G 665W solar panel. Specs: 21.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/mission-solar-mst12665hp3g" updated: 2026-09-11 --- # Mission Solar MST12665HP3G Middle of its segment, heavy for its output 320 panels in the segment PERC 650-700 W ## Identity - **Manufacturer:** Mission Solar - **Model:** MST12665HP3G - **Series:** PERC Bifacial 132HC - **Rated power:** 665 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 650-700 W (320 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 665 W | 660 W | Typical | | | Module efficiency | 21.40% | 21.25% | Typical | 8,323 | | Power density | 214.1 | 212.5 | Typical | 8,250 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 38.7 kg | 34.5 kg | Weak - bottom 19% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.40% | 21.25% | Typical | 8,323 | | Power density | 214.1 | 212.5 | Typical | 8,250 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 58.2 | 52.3 | Weak - bottom 19% | 11,622 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **58.2 kg per kWp** - Bottom 19% of the PERC 650-700 W segment, against a median of 52.3. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 665 W - **Efficiency:** 21.40 % - **Voltage at Pmax (Vmp):** 38.30 V - **Current at Pmax (Imp):** 17.39 A - **Open-circuit voltage (Voc):** 46.10 V - **Short-circuit current (Isc):** 18.50 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 5.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 38.7 kg - **Area:** 3.11 m2 - **Power density:** 214.1 Wp/m2 ### Warranty and degradation - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 565 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8323 of 14005 | | Power density | 8250 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 11622 of 14005 | | Warranty | 21 of 14005 | ## Pros - **US manufacturing, IRA benefits** - Modules are produced at the San Antonio, TX facility, qualifying for the federal Section 45X production tax credit and supporting the domestic content bonus adder for US commercial and utility-scale projects, while being exempt from AD/CVD tariffs applied to Chinese-origin components. - **30-year power warranty** - The manufacturer offers a 30-year linear power warranty, while most competing bifacial PERC lines on the market still standardly offer 25 years - the longer term simplifies LCOE planning for institutional investors. - **Efficiency on par with segment leaders** - Efficiency of 21.2-21.6% and power up to 670 Wp put the series on par with the best comparable PERC bifacial products - Hiwatt HW-M12/132H (670 Wp, 21.6%), Techwise Summit Series, and Resun RS9H-M (both 670 Wp, 21.57%). - **Glass-glass build resists hail** - Panels passed hail resistance testing at 25 mm diameter at 23 m/s and hold UL 61730 certification, making them a suitable choice for ground-mount PV farms, carports, and other high-exposure installations. - **US-based service support** - Warranty and after-sales support handled locally in the US shortens response times and simplifies claims logistics compared to Asian manufacturers servicing the market remotely. ## Cons - **No bankable Tier 1 status** - The manufacturer does not hold bankable Tier 1 status (BNEF), which can complicate financing for large commercial and utility-scale projects where banks and funds require modules from Tier 1 lists. - **PERC technology, not N-type** - The series is built on older PERC cells, while Mission Solar itself already offers a bifacial N-Type 132HC line rated up to 23.0% efficiency - PERC lags behind N-type in areas such as LID degradation and long-term power stability. - **Limited market track record** - The series launched in 2025, so there is no independent, multi-year field data yet confirming actual power degradation over a timeframe approaching the stated 30-year warranty. ## About this series The Mission Solar PERC Bifacial 132HC series is a range of modules designed to maximize energy yield in situations where every square meter counts. The use of **glass-glass construction** and **bifacial operation** allows for the effective utilization of reflected light from the ground, which significantly increases energy production in ground-mounted, flat-roofed, and carport installations. The **PERC cells in a half-cut configuration** help to minimize losses in partially shaded conditions and improve stability under variable sunlight. This solution is ideal for investors and installers who want to combine high power density with durability in demanding environments, from PV farms to commercial projects. Another key feature is **focus on resistance to external conditions**, which simplifies long-term planning and reduces the risk of downtime. Compared to typical monofacial modules, this series "earns" more from the appropriate albedo and mounting geometry, making it easier to extract more energy from the same surface. ## Notable figures - At 21.4% efficiency, this panel is on par with typical \*\*PERC 650-700W\*\* modules - At 214.1 W/m² power density, roof space requirements are typical for \*\*PERC 650-700W\*\* panels - Temperature coefficient of -0.34%/°C matches the \*\*PERC 650-700W\*\* median - At 38.7 kg (4.2 kg above \*\*PERC 650-700W\*\* median of 34.5 kg), requires checking roof load capacity - #8323 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### What is the maximum power output of Mission Solar PERC Bifacial 132HC panels? Mission Solar PERC Bifacial 132HC panels reach a peak power of up to 670 Wp. The 132 half-cut cell layout reduces resistive losses and improves shade tolerance. The bifacial glass-glass construction additionally harvests energy from light reflected off the ground surface, delivering higher annual energy yield compared to a monofacial module of the same nominal power rating. ### How long is the power output warranty on Mission Solar PERC Bifacial 132HC modules? Mission Solar provides a 30-year linear power warranty for the PERC Bifacial 132HC series — longer than the 25-year standard common across the industry. The product warranty covering manufacturing defects runs for 12 years. The extended linear warranty directly improves LCOE calculations for utility-scale and commercial PV projects planned over the full service life. ### Is Mission Solar a Tier 1 manufacturer, and where are PERC Bifacial 132HC modules made? Mission Solar Energy is not classified as a Tier 1 manufacturer on Bloomberg NEF or similar lists. However, PERC Bifacial 132HC modules are produced at the company's San Antonio, Texas facility with 1 GW of manufacturing capacity. That origin is a meaningful advantage for projects requiring Buy American Act compliance or domestic-content bonuses under the Inflation Reduction Act. ### Are Mission Solar PERC Bifacial 132HC panels suitable for flat roofs or carport structures? Yes, the PERC Bifacial 132HC series is particularly well-matched to flat roofs and carports. In both applications, the surface below — concrete, roofing membrane, or parking pavement — reflects light onto the rear side of the module, activating bifacial energy gain. The glass-glass construction also provides superior moisture resistance and UV stability, which matters for horizontal or low-tilt installations exposed to the elements. ### What advantage does glass-glass construction offer in PERC Bifacial 132HC modules over a standard backsheet design? Replacing the polymer backsheet with a second glass layer improves resistance to moisture ingress, PID (Potential Induced Degradation), and UV-induced degradation, resulting in a lower annual power degradation rate. The practical outcome is better power retention throughout the full 30-year warranty period and reduced risk of downtime caused by backsheet delamination or cracking. ### How much more energy does the bifacial PERC 132HC generate compared to a comparable monofacial module? Bifacial gain depends on ground albedo and mounting geometry. In typical ground-mount installations with light-colored surfaces or carport applications, bifacial PERC modules can generate 5% to 15% more energy than monofacial counterparts of the same nominal power. On dark-colored sloped roofs, the bifacial effect is negligible and should be excluded from energy yield estimates. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/c-mktg-0048-datasheet-for-mst-hp3g-ccdf6082ea9a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +3.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.4 pp | | [Mission Solar MST12660HP3G](https://comparepv.com/panel/mission-solar-mst12660hp3g) | 660 W | Very close match | | [Mission Solar MST12670HP3G](https://comparepv.com/panel/mission-solar-mst12670hp3g) | 670 W | +0.2 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +140 W, cooler, +3.7 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +135 W, cooler, +3.5 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +130 W, cooler, +3.4 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +125 W, cooler, +3.2 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +95 W, cooler, +3.1 pp | | [AIKO AIKO-A785-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a785-grh78dw) | 785 W | +120 W, cooler, +3.0 pp | | [Gokin GK-4-78HGBD-780M](https://comparepv.com/panel/gokin-gk-4-78hgbd-780m) | 780 W | +115 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/mission-solar-mst12665hp3g Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.