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425/MR vs 420/MR 18 of 19 identical Swap Change panels

JA Solar JAM54S30-425/MR vs JA Solar JAM54S30-420/MR

JA Solar JAM54S30-425/MR
JAM54S30-425/MR
425 Wp 21.80 % PERC
Open panel page Datasheet PDF
VS
JA Solar JAM54S30-420/MR
JAM54S30-420/MR
420 Wp 21.50 % PERC
Open panel page Datasheet PDF
The verdict

425/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 difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 425/MR 420/MR Difference
Module efficiency 21.80 % 21.50 % 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.
425/MR
13,774 kWh
420/MR
13,612 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 425/MR 420/MR
Standard test conditions 25 °C 100.0% of rated power 425 W 420 W
Cool, bright day 40 °C 94.8% of rated power 403 W 398 W
Typical summer roof 55 °C 89.5% of rated power 380 W 376 W
Hot roof 70 °C 84.2% of rated power 358 W 354 W
03

Full specification

Parameter 425/MR 420/MR Difference
Power and efficiency
Rated power 425 Wp 420 Wp Effectively the same
Module efficiency 21.80 % 21.50 % +0.30 pp for 425/MR
Power density 217.6 Wp/m² 215.1 Wp/m² Effectively the same
Open-circuit voltage 37.72 V 37.58 V Effectively the same
Voltage at max power 31.98 V 31.80 V Effectively the same
Short-circuit current 14.18 A 14.10 A Effectively the same
Current at max power 13.29 A 13.21 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 1722x1134x30 mm 1722x1134x30 mm Same
Module area 1.953 m² 1.953 m² Same
Weight 19.5 kg 19.5 kg Same
Weight per kWp 45.9 kg/kWp 46.4 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 108 108 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#7,022 vs #7,958
425/MR leads by 936 places
Power density
#7,172 vs #7,882
425/MR leads by 710 places
Heat behaviour
#10,419 vs #10,419
Tied - the same position in the database
Weight
#907 vs #1,155
425/MR leads by 248 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#10,817 vs #11,103
425/MR leads by 286 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM54S30-425/MR vs JA Solar JAM54S30-415/MR
3 differences, the largest is module efficiency
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JA Solar JAM54S30-425/MR vs JA Solar JAM54S30-410/MR
3 differences, the largest is module efficiency
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JA Solar JAM54S30-425/MR vs JA Solar JAM54S30-405/MR
4 differences, the largest is module efficiency
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JA Solar JAM54S30-425/MR vs JA Solar JAM54S31-405/MR
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54S30-425/MR vs JA Solar JAM54S30-400/MR
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54S30-425/MR vs JA Solar JAM54S31-400/MR
4 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM54S30-425/MR or JA Solar JAM54S30-420/MR?
According to our database: JA Solar JAM54S30-425/MR has higher module efficiency (21.80% vs 21.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM54S30-425/MR and JA Solar JAM54S30-420/MR?
JA Solar JAM54S30-425/MR has a module efficiency of 21.80%, while JA Solar JAM54S30-420/MR is 21.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54S30-425/MR use vs JA Solar JAM54S30-420/MR?
JA Solar JAM54S30-425/MR uses PERC cells; JA Solar JAM54S30-420/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 JAM54S30-425/MR and JA Solar JAM54S30-420/MR?
JA Solar JAM54S30-425/MR has a 25 years power warranty; JA Solar JAM54S30-420/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 342 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.