JA Solar JAM72S40-600/LR vs JA Solar JAM72S42-635/LR
VS
The verdict
JAM72S40-600/LR leads on the differences that matter
The largest is rated power: 35 W more power. 12 of 19 comparable parameters are identical.
See all 7 differencesHow alike are they
12
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
7 of 19 parameters
What actually differs
Parameter
JAM72S40-600/LR
JAM72S42-635/LR
Difference
Rated power
600 Wp
635 Wp
35 W more power
Weight
24.3 kg
29.6 kg
5.3 kg lighter
Weight per kWp
40.5 kg/kWp
46.6 kg/kWp
6.1 kg/kWp lighter
Module area
2.646 m²
2.795 m²
0.150 m² apart
Short-circuit current
14.48 A
15.26 A
0.78 A apart
Dimensions
2333x1134x30 mm
2465x1134x30 mm
2333x1134x30 mm vs 2465x1134x30 mm
Current at max power
13.71 A
14.40 A
0.69 A apart
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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
JAM72S40-600/LR
20,131 kWh
JAM72S42-635/LR
21,306 kWh
Lifetime gap
1,175 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM72S40-600/LR
JAM72S42-635/LR
Standard test conditions
25 °C
100.0% of rated power
600 W
635 W
Cool, bright day
40 °C
95.7% of rated power
574 W
607 W
Typical summer roof
55 °C
91.3% of rated power
548 W
580 W
Hot roof
70 °C
87.0% of rated power
522 W
552 W
03
Full specification
Parameter
JAM72S40-600/LR
JAM72S42-635/LR
Difference
Power and efficiency
Rated power
600 Wp
635 Wp
+35 W for JAM72S42-635/LR
Module efficiency
22.70 %
22.70 %
Same
Power density
226.8 Wp/m²
227.2 Wp/m²
Effectively the same
Open-circuit voltage
52.40 V
52.67 V
Effectively the same
Voltage at max power
43.76 V
44.10 V
Effectively the same
Short-circuit current
14.48 A
15.26 A
0.78 A apart
Current at max power
13.71 A
14.40 A
0.69 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2333x1134x30 mm
2465x1134x30 mm
2333x1134x30 mm vs 2465x1134x30 mm
Module area
2.646 m²
2.795 m²
0.150 m² apart
Weight
24.3 kg
29.6 kg
-5.3 kg for JAM72S40-600/LR
Weight per kWp
40.5 kg/kWp
46.6 kg/kWp
-6.1 kg/kWp for JAM72S40-600/LR
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
25 yrs
25 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
144
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#3,307
vs
#3,307
Tied - the same position in the database
Power density
#3,467
vs
#3,252
JAM72S42-635/LR leads by 215 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#164
vs
#1,257
JAM72S40-600/LR leads by 1,093 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#4,350
vs
#3,258
JAM72S42-635/LR leads by 1,092 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: JA Solar JAM72S40-600/LR or JA Solar JAM72S42-635/LR?
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 JA Solar JAM72S40-600/LR and JA Solar JAM72S42-635/LR?
JA Solar JAM72S40-600/LR has a module efficiency of 22.70%, while JA Solar JAM72S42-635/LR is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72S40-600/LR use vs JA Solar JAM72S42-635/LR?
JA Solar JAM72S40-600/LR uses TOPCon cells; JA Solar JAM72S42-635/LR uses TOPCon. 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 JA Solar JAM72S40-600/LR and JA Solar JAM72S42-635/LR?
JA Solar JAM72S40-600/LR has a 25 years power warranty; JA Solar JAM72S42-635/LR 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.
Shop prices: See 391 JA 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.