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Resun Solar Brand review

RS9H-M-660

660 Wp Monocrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 3,086 of 14,005
Compare panels Datasheet PDF
Power (Wp)
660
Strong · top 25%
Efficiency (%)
21.25
Weak · bottom 11%
Density (Wp/m²)
212.5
Weak · bottom 11%
Temp (%/°C)
-0.350
Weak · bottom 5%
Weight (kg)
33.6
Typical · median 32.7 kg
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

5,083 panels in the 560-760 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.25% 22.54% Weak · bottom 11% 8,904
Power density 212.5 225.4 Weak · bottom 11% 8,959
Temperature coefficient -0.350 -0.290 Weak · bottom 5% 10,419
Weight per kWp 50.9 53.1 Typical 4,268
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
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.

Watch-outs
-0.350 %/°C temperature coefficient

Bottom 5% of the 560-760 W band, against a median of -0.290. Ranked 10,419th in the whole database.

212.5 watts per square metre

Bottom 11% of the 560-760 W band, against a median of 225.4.

21.25% module efficiency

Bottom 11% of the 560-760 W band, against a median of 22.54%.

Notes from the database
  • Efficiency of 21.2% is 0.6pp below the database median (21.8%)
  • Power density of 212.5 W/m² is 5.6 W/m² below database median (218.1 W/m²) - needs more roof space
  • At -0.35%/°C, loses 0.05pp more power per degree than database median (-0.30%/°C)
  • Weight of 33.6 kg is 7.1 kg above database median (26.5 kg) - verify structural support
  • In the top 64% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.25 % Weak Segment median 22.54%
Vmpp · Impp 37.80 V · 17.46 A Operating point at max power
Voc · Isc 45.70 V · 18.53 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 33.6 kg Typical Typical · median 32.7 kg
Cells 132 Monocrystalline
Coefficient Pmax -0.350 %/°C Weak bottom 5% of its segment
Coefficient Voc · Isc -0.260 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
Degradation 0.50 % Per year after the first

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.350 %/°C against a segment median of -0.290
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS9H-M-660 660 W 21.25% -0.350 33.6 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.9 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.9 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +40 W, cooler, +3.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +35 W, cooler, +3.6 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.6 pp
RS9H-M-665 665 W 21.41% -0.350 33.6 kg Very close match
RS9H-M-670 670 W 21.57% -0.350 33.6 kg +10 W, +0.3 pp
RS9H-M-DG-675 675 W 21.73% -0.300 38.5 kg Cooler, heavier, +0.5 pp
RS9H-M-DG-680 680 W 21.89% -0.300 38.5 kg Cooler, heavier, +0.6 pp
RS9H-M-DG-685 685 W 22.05% -0.300 38.5 kg Cooler, heavier, +0.8 pp
RS9H-M-DG-690 690 W 22.21% -0.300 38.5 kg Cooler, heavier, +1.0 pp
RS9H-M-DG-695 695 W 22.37% -0.300 38.5 kg Cooler, heavier, +1.1 pp
RS9H-M-DG 700 W 22.53% -0.300 38.5 kg Cooler, heavier, +1.3 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +145 W, cooler, +3.9 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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).
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