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Renesola RS9-665MBG-E1
Renesola Brand review

RS9-665MBG-E1

665 Wp N-type Bifacial 1000%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 2,787 of 14,005
Compare panels Datasheet PDF
Power (Wp)
665
Typical for its class
Efficiency (%)
21.41
Weak · bottom 10%
Density (Wp/m²)
214.1
Weak · bottom 10%
Temp (%/°C)
-0.340
Weak · bottom 10%
Weight (kg)
37.5
Weak · 4.0 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Renesola RS9-650~670MBG-E1 series are dual-sided, dual-glass modules designed for high energy production in projects where every square meter and long-term stability are crucial. The glass-glass construction improves resistance to environmental factors and reduces the risk of microcracks, which translates into predictable yields over time. The use of mono-PERC solar cells and technologies such as half-cut cells and MBB technology supports higher efficiency in real conditions, even with weaker sunlight and less ideal light angles.

This is a good choice for PV farms and larger commercial installations, where the dual-sided module can effectively utilize reflections from the ground, increasing production without expanding the surface area. The series also features a long power warranty and a positive power tolerance, which simplifies design and reduces the risk of "under-delivery" of parameters in a finished installation.

Ranking

109 panels in the segment N-type 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.41% 23.30% Weak · bottom 10% 8,280
Power density 214.1 233.2 Weak · bottom 10% 8,250
Temperature coefficient -0.340 -0.290 Weak · bottom 10% 8,778
Weight per kWp 56.4 50.9 Weak · bottom 7% 10,635
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 5 caution
Best for

Utility-scale, commercial and shaded-installations.

Not ideal for

Weight-limited structures, tight roof space and roofs where every square metre has to count.

Watch-outs
56.4 kg per kWp

Bottom 7% of the N-type 650-700 W segment, against a median of 50.9. Ranked 10,635th in the whole database.

21.41% module efficiency

Bottom 10% of the N-type 650-700 W segment, against a median of 23.30%. Ranked 8,280th in the whole database.

214.1 watts per square metre

Bottom 10% of the N-type 650-700 W segment, against a median of 233.2. Ranked 8,250th in the whole database.

What owners get
N-type TOPCon cells with dual-glass construction

N-type TOPCon cells in a glass-glass build reduce LID/LeTID degradation and improve resistance to moisture and microcracks compared to older PERC modules with aluminum frames and backsheet foil.

High efficiency matching segment leaders

Efficiency up to 21.57% is identical to Techwise Solar Summit Series and Resun Solar RS9H-M (both 21.57%) and close to Hiwatt Solar HW-M12/132H (21.6%), placing the series on par with the best comparable products on the market.

30-year linear power warranty

The power warranty covers 30 years with a guaranteed minimum of 85% output at end of term, longer than the standard 25-year warranty offered by most tier-1 manufacturers, which eases LCOE modeling for long-term projects.

Bifacial design boosts yield without extra footprint

The dual-glass bifacial construction captures reflected light from the ground (e.g., light-colored soil, gravel, or snow), potentially adding several to double-digit percentage points of extra energy yield in ground-mount and utility-scale PV farms without increasing module footprint.

Half-cut cells and MBB technology

Half-cut cells combined with multi-busbar (MBB) design reduce resistive losses and improve module performance under partial shading and lower irradiance, resulting in a more stable production profile throughout the day.

Trade-offs
Production discontinued – limited availability

The RS9-650~670MBG-E1 series was manufactured from 2021 to 2024 and is now discontinued. This means limited access to remaining inventory, and potential future difficulties with warranty service and matching replacement modules in case of individual panel failure within an installation.

Lost BNEF Tier 1 status in Q3 2026

Renesola was still listed on the BNEF Tier 1 list as of Q1/Q2 2026, but was removed in the Q3 2026 update due to outstanding financial obligations flagged by BloombergNEF. This materially affects project bankability for financing requiring the manufacturer to hold current Tier 1 status at the time of financing agreement.

Notes from the database
  • Module efficiency of 21.4% is 1.9pp below average for N-type 650-700W panels (median: 23.3%)
  • 214.1 W/m² power density is 19.1 W/m² below N-type 650-700W median (233.2 W/m²) - requires larger installation area
  • At -0.34%/°C, loses 0.05pp more power per degree than N-type 650-700W median (-0.29%/°C)
  • At 37.5 kg, this panel is 4.0 kg heavier than the N-type 650-700W median (33.5 kg) - more demanding for installation crews
  • #8280 for efficiency, #8778 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 665 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.41 % Weak Segment median 23.30%
Vmpp · Impp 38.30 V · 17.39 A Operating point at max power
Voc · Isc 46.10 V · 18.50 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 37.5 kg Weak Weak · 4.0 kg above median
Cells 132 · N-type Monocrystalline
Bifaciality 1000 % Rear output as a share of front
Coefficient Pmax -0.340 %/°C Weak bottom 10% of its segment
Coefficient Voc · Isc -0.250 · 0.040 %/°C
NOCT 43 °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
End-of-warranty output 85.0 % Equals 565 W guaranteed
Degradation 2.00 → 0.45 % First year, then annual

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
-
With bifacial gain
-

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

Heat losses
-0.340 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Renesola RS9-665MBG-E1 665 W 21.41% -0.340 37.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.6 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.6 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +35 W, cooler, +3.6 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +30 W, cooler, +3.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.4 pp
RS9-650M-E1 650 W 20.92% -0.340 33.5 kg Lighter, -0.5 pp, -5 yr warranty
RS9-655M-E1 655 W 21.09% -0.340 33.5 kg Lighter, -0.3 pp, -5 yr warranty
RS9-660M-E1 660 W 21.25% -0.340 33.5 kg Lighter, -5 yr warranty
RS9-670M-E1 670 W 21.57% -0.340 33.5 kg Lighter, -5 yr warranty
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +140 W, cooler, +3.7 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +135 W, cooler, +3.5 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +130 W, cooler, +3.4 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +125 W, cooler, +3.2 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +95 W, cooler, +3.1 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 Renesola RS9-650~670MBG-E1 series still available for purchase?
The RS9-650~670MBG-E1 series has been discontinued by Renesola and is no longer available as a new factory order. Some distributors may still hold stock, so it is worth checking current inventory levels and confirming that warranty documentation can be provided before committing to a purchase. For new projects, Renesola's current lineup offers newer series with higher per-module power output.
What warranty does the Renesola RS9-650~670MBG-E1 come with?
Renesola backs the RS9-650~670MBG-E1 with a 12-year product warranty covering manufacturing defects and material faults, plus a 30-year linear power warranty guaranteeing at least 85% of rated power at end of life. Annual power degradation is capped at 0.45%. Both warranties are contingent on installation in accordance with the manufacturer's guidelines and require valid purchase documentation.
How much additional energy production can I expect from the bifacial design of the RS9-650~670MBG-E1?
The bifacial design captures sunlight reflected off the ground or surrounding surfaces through the rear glass, typically delivering 5–15% more energy than a comparable monofacial module. Actual bifacial gain depends heavily on ground albedo and mounting height above the surface. Ground-mounted utility systems with light-colored or sandy soil see the greatest benefit, while rooftop applications with low albedo gain significantly less.
What are the advantages of dual-glass construction in the RS9-650~670MBG-E1 compared to standard backsheet modules?
The glass-glass (dual glass) construction offers superior resistance to moisture ingress, ammonia, and corrosion compared to polymer backsheet modules. It also reduces the risk of microcracks and potential-induced degradation (PID). The trade-off is a higher weight of 38.7 kg versus approximately 28–30 kg for a backsheet module of similar power, which must be accounted for in racking design and installation planning.
How do the RS9-650~670MBG-E1 modules perform in low-light conditions and cold temperatures?
The temperature coefficient of Pmax is -0.35%/°C, meaning output can briefly exceed rated power during cold weather — an advantage in climates with cold but sunny mornings. MBB half-cut cell technology combined with gallium-doped wafers improves the module's weak-light response, resulting in better energy harvest during early morning, evening hours, and overcast conditions typical of northern European climates.
Are the Renesola RS9-650~670MBG-E1 670 Wp modules suitable for residential rooftop installations?
This series is designed primarily for utility-scale and large commercial PV plants. At 38.7 kg and 2384×1303×35 mm, the modules are difficult to maneuver on sloped residential rooftops and may exceed the load limits of standard residential rafter structures. For residential prosumer installations, lighter 400–450 Wp modules designed for the residential segment are a more practical choice. The RS9 MBG-E1 is best suited to flat commercial roofs with reinforced load-bearing capacity.
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