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REC REC640AA Pro MG
REC Brand review

REC640AA Pro MG

640 Wp HJT Bifacial 86%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 504 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)
36.8
Weak · 3.2 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The REC Alpha Pro MG series consists of glass-glass modules designed for installations where maximizing energy yield per square meter and predictable performance over many years are crucial. The use of two-sided heterojunction (HJT) cells allows for reduced losses at high temperatures and more stable energy production in challenging conditions, such as on heated roof surfaces. The bifacial design also utilizes reflected light from the ground, which is a significant advantage in ground-mounted installations, on reflective membrane roofs, or in elevated systems.

Another key feature of this series is the glass on both sides - it enhances resistance to environmental factors and improves durability compared to many standard modules with a backsheet. For business investors, the longer warranty period for power output is a key factor, facilitating energy cost planning and risk management. The REC Alpha Pro MG is an excellent choice for PV farms and commercial and industrial (C&I) applications, where reliability, performance in warm conditions, and the additional yield from bifaciality are priorities.

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 57.5 54.7 Weak · bottom 16% 11,246
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 · 2 caution
Best for

Commercial, utility-scale and hot-climate.

Not ideal for

Weight-limited structures.

Watch-outs
57.5 kg per kWp

Bottom 16% of the HJT 600-650 W segment, against a median of 54.7.

What owners get
Dual-glass boosts durability

Glass-glass construction instead of a standard backsheet improves resistance to moisture ingress, microcracks, and UV degradation, extending module lifespan in demanding operating conditions such as heated industrial rooftops.

HJT with low temperature coefficient

A power temperature coefficient of roughly -0.24%/°C (per manufacturer data for the Alpha Pro family) means lower output losses at high operating temperatures compared to typical PERC modules, which matters for installations on hot membrane roofs.

30-year product and power warranty

The manufacturer offers 30 years of both product and power warranty (min. 90.75% of rated power after 30 years) - notably longer than the standard 25 years offered by most peer comparables in this segment.

Bifacial design boosts energy yield

Dual-sided HJT cells capture light reflected from the ground, adding extra energy yield in ground-mount installations, on light-colored membrane roofs, and in elevated racking systems versus monofacial designs.

Tier-1 manufacturer since 1996, Norway HQ

REC is a bankable Tier-1 manufacturer with over 25 years of module production experience, reducing service-contract risk and easing project financing for C&I and utility-scale PV farms.

Trade-offs
Efficiency trails comparable 640 Wp modules

Peak efficiency of this series is 22.5%, while comparable 640 Wp modules from competitors reach higher figures: Jinko EAGLE G7B 23.69%, Jetion JT SRt(B) 22.9%, and Luxen N6 22.61%. At the same peak power, this means slightly more installation area is needed for the same energy yield.

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
  • Temperature coefficient of -0.24%/°C matches the HJT 600-650W median
  • Weight of 36.8 kg is 3.2 kg above HJT 600-650W median (33.6 kg) - verify structural support
  • Bifaciality factor of 86% can add 4-13% extra yield with reflective mounting surface

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 44.90 V · 17.89 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 36.8 kg Weak Weak · 3.2 kg above median
Cells 120 · HJT Monocrystalline
Bifaciality 86 % Rear output as a share of front
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.230 · 0.040 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 30 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 90.8 % Equals 581 W guaranteed
Degradation 2.00 → 0.25 % 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
-0.240 %/°C against a segment median of -0.240
-
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
REC REC640AA Pro MG 640 W 22.50% -0.240 36.8 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Hotter, lighter, +2.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +40 W, lighter, +2.7 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +35 W, lighter, +2.5 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Hotter, lighter, +2.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +30 W, lighter, +2.3 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +30 W, lighter, +2.3 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Hotter, lighter, +2.3 pp
REC590AA Pro MG 590 W 20.80% -0.240 36.8 kg -50 W, -1.7 pp
REC600AA PRO M 600 W 21.10% -0.240 32.5 kg Lighter, -1.4 pp, -5 yr warranty
REC610AA PRO M 610 W 21.50% -0.240 32.5 kg Lighter, -1.0 pp, -5 yr warranty
REC620AA PRO M 620 W 21.80% -0.240 32.5 kg Lighter, -0.7 pp, -5 yr warranty
REC630AA PRO M 630 W 22.20% -0.240 32.5 kg Lighter, -0.3 pp, -5 yr warranty
GKA210N120 680 W 24.03% -0.340 28.0 kg Hotter, lighter, +1.5 pp
GKA210N120-675 675 W 23.85% -0.340 28.0 kg Hotter, lighter, +1.4 pp
QN-670HJT-01 670 W 23.70% -0.240 35.5 kg +30 W, lighter, +1.2 pp
GKA210N120-670 670 W 23.67% -0.340 28.0 kg Hotter, lighter, +1.2 pp

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 is the power warranty on REC Alpha Pro MG panels and what does it actually cover?
The REC Alpha Pro MG Series comes with a 30-year product warranty and a 30-year power output warranty. Per REC's warranty terms, after 30 years the panel must retain at least 90.75% of its nameplate power, with annual degradation capped at 0.25% from year two onward. This is among the longest warranties in the C&I module segment and makes it straightforward to model LCOE across the full investment horizon.
Why do HJT panels in the REC Alpha Pro MG Series perform better in summer on hot industrial rooftops?
HJT cells carry a temperature coefficient of -0.24%/°C, which is among the lowest available in silicon PV. That means for every 10°C rise in module temperature the panel loses significantly less power than standard PERC cells (-0.35%/°C). On sun-heated industrial roofs this translates into a measurably higher annual energy yield with no additional hardware investment.
Does the glass-glass construction of the REC Alpha Pro MG actually extend panel lifespan?
Yes. Replacing the polymer backsheet with a rear glass pane eliminates the main causes of premature module aging: backsheet cracking, delamination, and moisture ingress. The glass-glass structure also improves mechanical strength and PID (potential induced degradation) resistance. This matters most in ground-mount and commercial rooftop installations with 20-plus-year payback horizons where long-term reliability is critical.
What real-world bifacial gain can I expect from REC Alpha Pro MG panels in a ground-mount system?
With a bifaciality factor above 70%, and proper mounting height over a high-albedo surface (sand, light gravel, white membrane), the additional energy yield from the rear side typically ranges from 5% to 15%, depending on ground albedo and tilt angle. On utility-scale PV farms with light-colored ground cover or flat commercial roofs with white TPO/PVC membrane, this bifacial gain can translate into a meaningfully lower LCOE compared to monofacial modules at the same STC rating.
Are the 640 Wp REC Alpha Pro MG panels suitable for a typical C&I installation, and how should they be connected to an inverter?
The REC Alpha Pro MG 640 Wp is purpose-built for C&I and utility-scale PV, not residential prosumer use. The open-circuit voltage (Voc) is approximately 44.9 V with a maximum system voltage of 1500 V DC. Modules are wired in series strings sized to match the MPPT window of a compatible three-phase string or central inverter rated for 1500 V. Always verify string length against the inverter's technical datasheet before system design.
How does the REC Alpha Pro MG Series differ from the more popular REC Alpha Pure-R aimed at residential customers?
The REC Alpha Pure-R targets residential prosumers with power outputs up to around 470 W, compact dimensions, and a sleek all-black aesthetic. The REC Alpha Pro MG is positioned for C&I and utility-scale: up to 640 Wp, glass-glass construction, a 30-year warranty, and bifacial optimization for ground-mount and large industrial rooftop installations. Both series share HJT cell technology but differ significantly in power class, module format, and target application.
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