--- title: "Resun Solar RS9H-M-665 665W Solar Panel - Specs & Review | ComparePV" description: "Resun Solar RS9H-M-665 665W solar panel. Specs: 21.41% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/resun-solar-rs9h-m-665" updated: 2026-09-11 --- # Resun Solar RS9H-M-665 Middle of its segment, weak in heat 4,929 panels in the 565-765 W band, all technologies ## Identity - **Manufacturer:** Resun Solar - **Model:** RS9H-M-665 - **Series:** RS9H-M - **Rated power:** 665 W - **Cell technology:** Monocrystalline ## How it compares Compared against 565-765 W band, all technologies (4929 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 665 W | 620 W | Strong - top 23% | | | Module efficiency | 21.41% | 22.58% | Weak - bottom 15% | 8,280 | | Power density | 214.1 | 225.8 | Weak - bottom 15% | 8,250 | | Temperature coefficient | -0.350 | -0.290 | Weak - bottom 4% | 10,419 | | Weight (kg) | 33.6 kg | 33.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.41% | 22.58% | Weak - bottom 15% | 8,280 | | Power density | 214.1 | 225.8 | Weak - bottom 15% | 8,250 | | Temperature coefficient | -0.350 | -0.290 | Weak - bottom 4% | 10,419 | | Weight per kWp | 50.5 | 53.1 | Typical | 3,892 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.350 %/°C temperature coefficient** - Bottom 4% of the 565-765 W band, against a median of -0.290. Ranked 10,419th in the whole database. - **214.1 watts per square metre** - Bottom 15% of the 565-765 W band, against a median of 225.8. - **21.41% module efficiency** - Bottom 15% of the 565-765 W band, against a median of 22.58%. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Hot climates, roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 665 W - **Efficiency:** 21.41 % - **Voltage at Pmax (Vmp):** 38.00 V - **Current at Pmax (Imp):** 17.50 A - **Open-circuit voltage (Voc):** 45.90 V - **Short-circuit current (Isc):** 18.57 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 132 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 33.6 kg - **Area:** 3.11 m2 - **Power density:** 214.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 562 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8280 of 14005 | | Power density | 8250 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 3892 of 14005 | | Warranty | 21 of 14005 | ## About this series The RS9H-M series from Resun Solar is a commercial and industrial module built on 132 **half-cut cells** of the large-format 210 mm mono-crystalline type, connected in a **multi-busbar 10/12BB** configuration. This approach reduces internal power loss and lowers the risk of failure caused by microcracks or broken busbars, translating into more stable performance throughout the system's service life. Splitting the cells in half further increases resistance to the hot-spot effect caused by partial shading, which matters in PV farms and on industrial rooftops where shading from chimneys or antennas is common. The panel also stands out for its **high PID resistance**, limiting power degradation over time and contributing to a lower levelized cost of energy (LCOE). The 3.2 mm tempered front glass with anti-reflective coating improves energy yield under low-light conditions, while the certified, robust frame construction withstands high wind and snow loads. The module is additionally resistant to salt mist and ammonia, making it a solid choice for coastal and agricultural installations. The RS9H-M series is well suited wherever **reliability, high conversion efficiency**, and long-term investment return are priorities. ## Notable figures - Efficiency of 21.4% matches the \*\*database\*\* median - Power density of 214.1 W/m² is 4.0 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - -0.35%/°C temperature coefficient - 0.05pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - At 33.6 kg, this panel is 7.1 kg heavier than the \*\*database\*\* median (26.5 kg) - more demanding for installation crews - Ranked #8280 out of 14005 panels for efficiency in the database ## Questions ### Is the Resun Solar RS9H-M series still available for purchase? The RS9H-M series has been discontinued from Resun Solar's current production lineup and replaced by newer models. Panels may still be available from some distributors as remaining stock, so it's worth confirming availability and manufacturing date before purchase, especially when expanding an existing installation with identical modules. ### What warranty comes with Resun Solar RS9H-M panels? The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. This level of coverage is typical for modern commercial half-cut panels and gives investors predictable energy yields over a long operational horizon. ### How does half-cut cell technology in the RS9H-M differ from full-size cells? The RS9H-M uses 132 monocrystalline cells in a large 210 mm format, cut in half and connected in a 10/12BB multi-busbar configuration. This reduces the current flowing through each cell, lowering resistive losses and the risk of microcracks. It also improves resistance to partial shading, reducing the hot-spot effect common in large rooftop arrays. ### Are RS9H-M panels suitable for coastal or agricultural installations? Yes, RS9H-M modules are certified resistant to salt mist and ammonia, making them a suitable choice for PV farms near the coast as well as installations on farm buildings, where elevated nitrogen compound levels are common. This is a meaningful advantage over standard panels lacking such certification. ### What is the maximum power output of the RS9H-M and what installations is it suited for? The panels reach up to 670 Wp, placing them in the commercial and industrial segment of high power-density modules. They are well suited for large rooftops of production halls and warehouses, as well as ground-mounted solar farms, where maximizing energy yield from limited mounting area matters most. ### Are RS9H-M panels resistant to PID degradation, and how does that affect the cost of energy? Yes, the RS9H-M series offers high resistance to PID (potential-induced degradation), which in lower-quality panels can reduce power output by double-digit percentages within a few years of operation. Limiting this effect results in more stable energy yield throughout the panel's lifetime and a lower levelized cost of energy (LCOE). ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/RS9H-M-660-670-min-b48a71f740e1.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 | +35 W, cooler, +3.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +30 W, cooler, +3.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.4 pp | | [Resun Solar RS9H-M-660](https://comparepv.com/panel/resun-solar-rs9h-m-660) | 660 W | Very close match | | [Resun Solar RS9H-M-670](https://comparepv.com/panel/resun-solar-rs9h-m-670) | 670 W | Very close match | | [Resun Solar RS9H-M-DG-675](https://comparepv.com/panel/resun-solar-rs9h-m-dg-675) | 675 W | Cooler, heavier, +0.3 pp | | [Resun Solar RS9H-M-DG-680](https://comparepv.com/panel/resun-solar-rs9h-m-dg-680) | 680 W | Cooler, heavier, +0.5 pp | | [Resun Solar RS9H-M-DG-685](https://comparepv.com/panel/resun-solar-rs9h-m-dg-685) | 685 W | Cooler, heavier, +0.6 pp | | [Resun Solar RS9H-M-DG-690](https://comparepv.com/panel/resun-solar-rs9h-m-dg-690) | 690 W | Cooler, heavier, +0.8 pp | | [Resun Solar RS9H-M-DG-695](https://comparepv.com/panel/resun-solar-rs9h-m-dg-695) | 695 W | Cooler, heavier, +1.0 pp | | [Resun Solar RS9H-M-DG](https://comparepv.com/panel/resun-solar-rs9h-m-dg) | 700 W | Cooler, heavier, +1.1 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +140 W, cooler, +3.7 pp | --- Source: https://comparepv.com/panel/resun-solar-rs9h-m-665 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.