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REC REC640AA PRO M

REC640AA PRO M

640 Wp HJT Bifacial
ComparePV verdict

Light for its output, short guarantee

Rank 1,949 of 14,005
Compare panels Datasheet PDF
Power (Wp)
640
Strong · top 13%
Efficiency (%)
22.50
Typical · median 22.60%
Density (Wp/m²)
225.5
Typical · median 225.8
Temp (%/°C)
-0.240
Typical · median -0.240
Weight (kg)
32.5
Strong · 1.1 kg below median
Warranty (yrs)
25
Weak · bottom 3%

The REC Alpha Pro M series consists of modules designed for large-scale installations where maximizing power output per square meter and quick installation on rooftops or on the ground are key. A key advantage is the n-type HJT cell technology, which reduces typical start-up losses and performs more stably in high temperatures - making it easier to predict energy production and project profitability. The advanced, solderless cell interconnection with a dense network of conductors, which reduces the risk of microcracks and power drops over time, is also noteworthy. This translates to fewer unexpected service issues and more consistent performance across the entire module park.

The REC Alpha Pro M stands out with its Twin Design, which helps maintain power generation even with partial shading or soiling - a common problem on industrial rooftops. Furthermore, the reinforced structure with supporting elements increases resistance to loads. This is a solution for companies, halls, PV farms, and investors who need high power output from a limited area, without compromising on durability and warranties.

Ranking

76 panels in the segment HJT 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.50% 22.60% Typical 4,222
Power density 225.5 225.8 Typical 3,889
Temperature coefficient -0.240 -0.240 Typical 13
Weight per kWp 50.8 54.7 Strong · top 1% 4,196
Performance warranty 25 yrs 30 yrs Weak · bottom 3% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 2 caution
Best for

Commercial, utility-scale, shaded-installations and hot-climate.

Not ideal for

Owners who want a long output guarantee.

Strengths
50.8 kg per kWp

Top 1% of the HJT 600-650 W segment, against a median of 54.7. Ranked 4,196th in the whole database.

Watch-outs
25 year performance warranty

Bottom 3% of the HJT 600-650 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database.

What owners get
N-type HJT cells with stable temp. coefficient

The power temperature coefficient is -0.24%/K, notably better than the typical -0.35%/K for PERC modules, and HJT technology eliminates light-induced degradation (LID). This delivers higher and more predictable energy yield on hot days, critical for large rooftop and ground-mount installations.

25-year power warranty with >92% retention

The manufacturer guarantees a minimum of 92% of nameplate power after 25 years of operation, backed by a 20-year product warranty. This is a solid, linear degradation profile that simplifies long-term project bankability modeling.

>70% bifaciality and Twin Design technology

The module generates power from both cell sides (bifaciality above 70%), and the patented Twin Design with a redundant current path reduces output losses under partial shading or soiling - a common issue on industrial rooftops.

Reinforced construction for high mechanical loads

The panel withstands test loads up to 5400 Pa, and combined with solder-free, dense cell interconnection (120 half-cut cells), lowers the risk of microcracks and service failures in installations exposed to wind and snow loads.

Tier-1 manufacturer with in-house production

REC Group (Norway, founded in 1996) is recognized as a bankable Tier-1 manufacturer by BloombergNEF, and Alpha Pro M modules are produced at its own Singapore facility, easing project financing for banks and institutional investors.

Trade-offs
Efficiency trails top TOPCon peers

Maximum efficiency of 22.5% (640 Wp) is lower than same power-class competitors: Jinko EAGLE G7B reaches 23.69%, Jetion JT SRt(B) 22.9%, and Luxen N6 22.61%. Despite the premium HJT technology, REC requires relatively more roof area for the equivalent installed capacity.

Notes from the database
  • At 22.5% efficiency, this panel is on par with typical HJT 600-650W modules
  • Power density of 225.5 W/m² matches the HJT 600-650W median
  • At -0.24%/°C, hot weather performance is typical for HJT 600-650W panels
  • At 32.5 kg, this panel is 1.1 kg lighter than HJT 600-650W median (33.6 kg) - easier handling during installation
  • Ranked #4222 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 640 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.50 % Typical Segment median 22.60%
Vmpp · Impp 37.10 V · 17.26 A Operating point at max power
Voc · Isc 44.60 V · 17.93 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2175×1305×30 mm · 2.84 m² of roof
Weight 32.5 kg Strong Strong · 1.1 kg below median
Cells 120 · HJT Monocrystalline
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 20 years Hardware defects only
Performance warranty 25 years Weak bottom 3% · median 30 yrs
End-of-warranty output 92.0 % Equals 581 W guaranteed
Degradation 2.00 → 0.25 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by REC in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 640 Wp appear here. The rest cover the whole series.

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
-0.240 %/°C against a segment median of -0.240
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
REC REC640AA PRO M 640 W 22.50% -0.240 32.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Lighter, +2.7 pp, +5 yr warranty
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +40 W, +2.7 pp, +5 yr warranty
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +35 W, +2.5 pp, +5 yr warranty
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Lighter, +2.5 pp, +5 yr warranty
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Lighter, +2.3 pp, +5 yr warranty
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Lighter, +2.3 pp, +5 yr warranty
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Lighter, +2.3 pp, +5 yr warranty
REC590AA Pro MG 590 W 20.80% -0.240 36.8 kg -50 W, -1.7 pp, +5 yr warranty
REC600AA PRO M 600 W 21.10% -0.240 32.5 kg -40 W, -1.4 pp
REC610AA PRO M 610 W 21.50% -0.240 32.5 kg -30 W, -1.0 pp
REC620AA PRO M 620 W 21.80% -0.240 32.5 kg -20 W, -0.7 pp
REC630AA PRO M 630 W 22.20% -0.240 32.5 kg -10 W, -0.3 pp
GKA210N120 680 W 24.03% -0.340 28.0 kg Hotter, +1.5 pp, +5 yr warranty
GKA210N120-675 675 W 23.85% -0.340 28.0 kg Hotter, +1.4 pp, +5 yr warranty
QN-670HJT-01 670 W 23.70% -0.240 35.5 kg +30 W, +1.2 pp, +5 yr warranty
GKA210N120-670 670 W 23.67% -0.340 28.0 kg Hotter, +1.2 pp, +5 yr warranty

Found 497 panels of the same or similar size to this one, within ±10 mm. See them here Found 502 panels of the same or similar size to this one, within ±25 mm. See them here Found 502 panels of the same or similar size to this one, within ±50 mm. See them here Found 506 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the REC Alpha Pro M Series come with?
The REC Alpha Pro M Series carries a 20-year product warranty and a 25-year linear power performance warranty. REC guarantees at least 92% of nominal power output after 25 years of operation. This is one of the most comprehensive warranty packages in the commercial and industrial PV segment, backed by REC Group's Tier 1 manufacturer status, Norwegian heritage, and production facilities in Singapore.
What is HJT technology and why does it matter in the REC Alpha Pro M Series?
HJT (Heterojunction Technology) uses n-type crystalline silicon cells wrapped in a thin amorphous silicon passivation layer that minimizes carrier recombination losses. In the REC Alpha Pro M, this results in up to 22.5% module efficiency and a best-in-class temperature coefficient of -0.24%/°C. Compared to standard PERC modules (typically -0.35%/°C), the Alpha Pro M retains significantly more power on hot summer days, improving long-term LCOE for large-scale commercial and industrial projects.
Is the REC Alpha Pro M a bifacial panel, and what energy gain can I realistically expect?
Yes, the REC Alpha Pro M is a bifacial module with a bifaciality factor exceeding 70%. The rear side captures albedo light reflected from the ground surface, which can add 5–15% to annual energy yield depending on ground reflectivity and mounting height. Ground-mount installations over highly reflective surfaces such as gravel, concrete, or snow benefit the most. Adequate racking clearance above ground is recommended to fully leverage the bifacial gain.
Is the REC Alpha Pro M 640W suitable for industrial rooftop or warehouse installation?
Yes. The 640W module (2175×1305×30 mm, 32.5 kg) is engineered for large commercial and industrial (C&I) rooftop and ground-mount deployments. The reinforced frame withstands mechanical loads up to +5400 Pa on both front and rear surfaces. The Twin Design architecture maintains power generation under partial shading caused by HVAC units, skylights, or roof penetrations — a common challenge on industrial rooftops — making it a reliable choice for high-density commercial PV arrays.
How does the REC Alpha Pro M perform in cold weather and low-light winter conditions?
Thanks to HJT n-type cell technology, the REC Alpha Pro M has a temperature coefficient of -0.24%/°C, meaning it loses considerably less power in heat and performs better in cold compared to PERC modules (typically -0.35%/°C). On cold, sunny winter days, the module can reach or briefly exceed its STC-rated power. The 22.5% module efficiency also helps maximize energy harvest during winter months when irradiance is limited.
How does the REC Alpha Pro M Series differ from the REC Alpha Pure Series for residential use?
The REC Alpha Pro M targets commercial, industrial, and utility-scale applications with power ratings of 600–640W and larger module dimensions optimized for high-density PV arrays. The REC Alpha Pure is designed for the residential and small prosumer market, featuring smaller modules with lower per-panel power output. Both series share n-type HJT cell technology, but the Pro M prioritizes maximum watts per square meter and enhanced structural durability suited to demanding commercial and industrial environments.
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