Adani Solar ASM-M12-132-645 vs Adani Solar ASM-M12-132-640
VS
The verdict
Identical on every published parameter
All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
19
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
0 of 19 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
645
20,904 kWh
640
20,742 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
645
640
Standard test conditions
25 °C
100.0% of rated power
645 W
640 W
Cool, bright day
40 °C
94.9% of rated power
612 W
607 W
Typical summer roof
55 °C
89.8% of rated power
579 W
575 W
Hot roof
70 °C
84.7% of rated power
546 W
542 W
03
Full specification
Parameter
645
640
Difference
Power and efficiency
Rated power
645 Wp
640 Wp
Effectively the same
Module efficiency
20.71 %
20.55 %
Effectively the same
Power density
207.1 Wp/m²
205.5 Wp/m²
Effectively the same
Open-circuit voltage
43.47 V
43.28 V
Effectively the same
Voltage at max power
37.15 V
37.01 V
Effectively the same
Short-circuit current
18.75 A
18.69 A
Effectively the same
Current at max power
17.37 A
17.31 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2390x1303x35 mm
2390x1303x35 mm
Same
Module area
3.114 m²
3.114 m²
Same
Weight
33.6 kg
33.6 kg
Same
Weight per kWp
52.1 kg/kWp
52.5 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.55 %/yr
0.55 %/yr
Same
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#10,721
vs
#11,208
645 leads by 487 places
Power density
#10,759
vs
#11,191
645 leads by 432 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#5,539
vs
#6,043
645 leads by 504 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#4,257
vs
#4,636
645 leads by 379 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: Adani Solar ASM-M12-132-645 or Adani Solar ASM-M12-132-640?
According to our database: Adani Solar ASM-M12-132-645 has higher module efficiency (20.71% vs 20.55%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Adani Solar ASM-M12-132-645 and Adani Solar ASM-M12-132-640?
Adani Solar ASM-M12-132-645 has a module efficiency of 20.71%, while Adani Solar ASM-M12-132-640 is 20.55%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Adani Solar ASM-M12-132-645 use vs Adani Solar ASM-M12-132-640?
Adani Solar ASM-M12-132-645 uses PERC cells; Adani Solar ASM-M12-132-640 uses PERC. 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 Adani Solar ASM-M12-132-645 and Adani Solar ASM-M12-132-640?
Adani Solar ASM-M12-132-645 has a 30 years power warranty; Adani Solar ASM-M12-132-640 has a 30 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.
Shop prices: See 2 Adani Solar offers
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.