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450/MR vs 455/MR 18 of 19 identical Swap Change panels

JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-455/MR

JA Solar JAM72S20-450/MR
JAM72S20-450/MR
450 Wp 20.30 % PERC
Open panel page Datasheet PDF
VS
JA Solar JAM72S20-455/MR
JAM72S20-455/MR
455 Wp 20.50 % PERC
Open panel page Datasheet PDF
The verdict

455/MR leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 450/MR 455/MR Difference
Module efficiency 20.30 % 20.50 % 0.20 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
455/MR
14,746 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 450/MR 455/MR
Standard test conditions 25 °C 100.0% of rated power 450 W 455 W
Cool, bright day 40 °C 94.8% of rated power 426 W 431 W
Typical summer roof 55 °C 89.5% of rated power 403 W 407 W
Hot roof 70 °C 84.2% of rated power 379 W 383 W
03

Full specification

Parameter 450/MR 455/MR Difference
Power and efficiency
Rated power 450 Wp 455 Wp Effectively the same
Module efficiency 20.30 % 20.50 % +0.20 pp for 455/MR
Power density 202.5 Wp/m² 204.8 Wp/m² Effectively the same
Open-circuit voltage 49.70 V 49.85 V Effectively the same
Voltage at max power 41.52 V 41.82 V Effectively the same
Short-circuit current 11.36 A 11.41 A Effectively the same
Current at max power 10.84 A 10.88 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 53.8 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

Against the whole database

14,005 panels
Efficiency
#11,769 vs #11,308
455/MR leads by 461 places
Power density
#11,847 vs #11,472
455/MR leads by 375 places
Heat behaviour
#10,419 vs #10,419
Tied - the same position in the database
Weight
#8,755 vs #7,897
455/MR leads by 858 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#11,425 vs #11,208
455/MR leads by 217 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-470/MR
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-465/MR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-460/MR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-445/MR
One difference: module efficiency
Same manufacturer
JA Solar JAM72S20-450/MR vs JA Solar JAM66D46-740/LB
15 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM72S20-450/MR vs JA Solar JAM66D46-735/LB
15 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72S20-450/MR or JA Solar JAM72S20-455/MR?
According to our database: JA Solar JAM72S20-455/MR has higher module efficiency (20.50% vs 20.30%). 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 JAM72S20-455/MR?
JA Solar JAM72S20-450/MR has a module efficiency of 20.30%, while JA Solar JAM72S20-455/MR is 20.50%. 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 JAM72S20-455/MR?
JA Solar JAM72S20-450/MR uses PERC cells; JA Solar JAM72S20-455/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 JAM72S20-455/MR?
JA Solar JAM72S20-450/MR has a 25 years power warranty; JA Solar JAM72S20-455/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.