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Pro MG vs PRO M 15 of 19 identical Swap Change panels

REC REC640AA Pro MG vs REC REC640AA PRO M

REC REC640AA Pro MG
REC
REC640AA Pro MG
640 Wp 22.50 % HJT Bifacial
Open panel page Datasheet PDF
VS
REC REC640AA PRO M
REC
REC640AA PRO M
640 Wp 22.50 % HJT Bifacial
Open panel page Datasheet PDF
The verdict

4 differences, and they point both ways

The largest is performance warranty: 5 yrs longer. 15 of 19 comparable parameters are identical.

See all 4 differences
How alike are they
15 of 19 comparable
parameters are identical
identical differs
01

What actually differs

4 of 19 parameters
Parameter Pro MG PRO M Difference
Performance warranty 30 yrs 25 yrs 5 yrs longer
Weight 36.8 kg 32.5 kg 4.3 kg lighter
Product warranty 30 yrs 20 yrs 10 yrs longer
Weight per kWp 57.5 kg/kWp 50.8 kg/kWp 6.7 kg/kWp lighter
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.240 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
Pro MG
21,744 kWh
PRO M
21,744 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario Pro MG PRO M
Standard test conditions 25 °C 100.0% of rated power 640 W 640 W
Cool, bright day 40 °C 96.4% of rated power 617 W 617 W
Typical summer roof 55 °C 92.8% of rated power 594 W 594 W
Hot roof 70 °C 89.2% of rated power 571 W 571 W
03

Full specification

Parameter Pro MG PRO M Difference
Power and efficiency
Rated power 640 Wp 640 Wp Same
Module efficiency 22.50 % 22.50 % Same
Power density 225.5 Wp/m² 225.5 Wp/m² Same
Open-circuit voltage 44.90 V 44.60 V Effectively the same
Voltage at max power 37.10 V 37.10 V Same
Short-circuit current 17.89 A 17.93 A Effectively the same
Current at max power 17.26 A 17.26 A Same
Temperature
Temperature coefficient -0.240 %/°C -0.240 %/°C Same
Mechanical
Dimensions 2175x1305x30 mm 2175x1305x30 mm Same
Module area 2.838 m² 2.838 m² Same
Weight 36.8 kg 32.5 kg -4.3 kg for PRO M
Weight per kWp 57.5 kg/kWp 50.8 kg/kWp -6.7 kg/kWp for PRO M
Warranty and degradation
Product warranty 30 yrs 20 yrs +10 yrs for Pro MG
Performance warranty 30 yrs 25 yrs +5 yrs for Pro MG
Annual degradation 0.25 %/yr 0.25 %/yr Same
Technology
Cell technology HJT HJT Same
Cell type Monocrystalline Monocrystalline Same
Cell count 120 120 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#4,222 vs #4,222
Tied - the same position in the database
Power density
#3,889 vs #3,889
Tied - the same position in the database
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#11,246 vs #4,196
PRO M leads by 7,050 places
Warranty
#21 vs #9,798
Pro MG leads by 9,777 places
Overall
#504 vs #1,949
Pro MG leads by 1,445 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: REC REC640AA Pro MG or REC REC640AA PRO M?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of REC REC640AA Pro MG and REC REC640AA PRO M?
REC REC640AA Pro MG has a module efficiency of 22.50%, while REC REC640AA PRO M is 22.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does REC REC640AA Pro MG use vs REC REC640AA PRO M?
REC REC640AA Pro MG uses HJT cells; REC REC640AA PRO M uses HJT. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on REC REC640AA Pro MG and REC REC640AA PRO M?
REC REC640AA Pro MG has a 30 years power warranty; REC REC640AA PRO M has a 25 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are REC REC640AA Pro MG and REC REC640AA PRO M bifacial panels?
Both REC REC640AA Pro MG and REC REC640AA PRO M are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.