JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-445/MR
VS
The verdict
450/MR leads on the differences that matter
The largest is module efficiency: 0.30 pp more efficient. 18 of 19 comparable parameters are identical.
See the one differenceHow alike are they
18
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
1 of 19 parameters
What actually differs
Parameter
450/MR
445/MR
Difference
Module efficiency
20.30 %
20.00 %
0.30 pp more efficient
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 (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
450/MR
14,584 kWh
445/MR
14,422 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
450/MR
445/MR
Standard test conditions
25 °C
100.0% of rated power
450 W
445 W
Cool, bright day
40 °C
94.8% of rated power
426 W
422 W
Typical summer roof
55 °C
89.5% of rated power
403 W
398 W
Hot roof
70 °C
84.2% of rated power
379 W
375 W
03
Full specification
Parameter
450/MR
445/MR
Difference
Power and efficiency
Rated power
450 Wp
445 Wp
Effectively the same
Module efficiency
20.30 %
20.00 %
+0.30 pp for 450/MR
Power density
202.5 Wp/m²
200.3 Wp/m²
Effectively the same
Open-circuit voltage
49.70 V
49.56 V
Effectively the same
Voltage at max power
41.52 V
41.21 V
Effectively the same
Short-circuit current
11.36 A
11.32 A
Effectively the same
Current at max power
10.84 A
10.80 A
Effectively the same
Temperature
Temperature coefficient
-0.350 %/°C
-0.350 %/°C
Same
Mechanical
Dimensions
2112x1052x35 mm
2112x1052x35 mm
Same
Module area
2.222 m²
2.222 m²
Same
Weight
24.5 kg
24.5 kg
Same
Weight per kWp
54.4 kg/kWp
55.1 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
25 yrs
25 yrs
Same
Annual degradation
0.55 %/yr
0.55 %/yr
Same
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
144
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#11,769
vs
#12,214
450/MR leads by 445 places
Power density
#11,847
vs
#12,162
450/MR leads by 315 places
Heat behaviour
#10,419
vs
#10,419
Tied - the same position in the database
Weight
#8,755
vs
#9,435
450/MR leads by 680 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#11,425
vs
#11,694
450/MR leads by 269 places
05
Open the full database
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06
Written summary
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Questions about this pairing
Which panel is better: JA Solar JAM72S20-450/MR or JA Solar JAM72S20-445/MR?
According to our database: JA Solar JAM72S20-450/MR has higher module efficiency (20.30% vs 20.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM72S20-450/MR and JA Solar JAM72S20-445/MR?
JA Solar JAM72S20-450/MR has a module efficiency of 20.30%, while JA Solar JAM72S20-445/MR is 20.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72S20-450/MR use vs JA Solar JAM72S20-445/MR?
JA Solar JAM72S20-450/MR uses PERC cells; JA Solar JAM72S20-445/MR 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 JA Solar JAM72S20-450/MR and JA Solar JAM72S20-445/MR?
JA Solar JAM72S20-450/MR has a 25 years power warranty; JA Solar JAM72S20-445/MR 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.