REC REC610AA PRO M vs REC REC640AA PRO M
VS
The verdict
REC640AA PRO M leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 15 of 19 comparable parameters are identical.
See all 4 differencesHow alike are they
15
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
4 of 19 parameters
What actually differs
Parameter
REC610AA PRO M
REC640AA PRO M
Difference
Module efficiency
21.50 %
22.50 %
1.00 pp more efficient
Power density
214.9 Wp/m²
225.5 Wp/m²
10.6 Wp/m² higher
Rated power
610 Wp
640 Wp
30 W more power
Weight per kWp
53.3 kg/kWp
50.8 kg/kWp
2.5 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.
REC610AA PRO M
20,725 kWh
REC640AA PRO M
21,744 kWh
Lifetime gap
1,019 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
REC610AA PRO M
REC640AA PRO M
Standard test conditions
25 °C
100.0% of rated power
610 W
640 W
Cool, bright day
40 °C
96.4% of rated power
588 W
617 W
Typical summer roof
55 °C
92.8% of rated power
566 W
594 W
Hot roof
70 °C
89.2% of rated power
544 W
571 W
03
Full specification
Parameter
REC610AA PRO M
REC640AA PRO M
Difference
Power and efficiency
Rated power
610 Wp
640 Wp
+30 W for REC640AA PRO M
Module efficiency
21.50 %
22.50 %
+1.00 pp for REC640AA PRO M
Power density
214.9 Wp/m²
225.5 Wp/m²
+10.6 Wp/m² for REC640AA PRO M
Open-circuit voltage
44.30 V
44.60 V
Effectively the same
Voltage at max power
36.30 V
37.10 V
Effectively the same
Short-circuit current
17.72 A
17.93 A
Effectively the same
Current at max power
16.81 A
17.26 A
Effectively the 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
32.5 kg
32.5 kg
Same
Weight per kWp
53.3 kg/kWp
50.8 kg/kWp
-2.5 kg/kWp for REC640AA PRO M
Warranty and degradation
Product warranty
20 yrs
20 yrs
Same
Performance warranty
25 yrs
25 yrs
Same
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
14,005 panels
Against the whole database
Efficiency
#7,958
vs
#4,222
REC640AA PRO M leads by 3,736 places
Power density
#8,029
vs
#3,889
REC640AA PRO M leads by 4,140 places
Heat behaviour
#13
vs
#13
Tied - the same position in the database
Weight
#7,135
vs
#4,196
REC640AA PRO M leads by 2,939 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#3,978
vs
#1,949
REC640AA PRO M leads by 2,029 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: REC REC610AA PRO M or REC REC640AA PRO M?
According to our database: REC REC640AA PRO M has higher module efficiency (22.50% vs 21.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of REC REC610AA PRO M and REC REC640AA PRO M?
REC REC610AA PRO M has a module efficiency of 21.50%, 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 REC610AA PRO M use vs REC REC640AA PRO M?
REC REC610AA PRO M 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 REC610AA PRO M and REC REC640AA PRO M?
REC REC610AA PRO M has a 25 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 REC610AA PRO M and REC REC640AA PRO M bifacial panels?
Both REC REC610AA PRO M 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.