JA Solar JAM54S30-405/MR vs JA Solar JAM54S30-395/MR
VS
The verdict
405/MR leads on the differences that matter
The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
405/MR
395/MR
Difference
Module efficiency
20.70 %
20.20 %
0.50 pp more efficient
Power density
207.4 Wp/m²
202.3 Wp/m²
5.1 Wp/m² higher
Rated power
405 Wp
395 Wp
10 W more power
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.
405/MR
13,126 kWh
395/MR
12,802 kWh
Lifetime gap
324 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
405/MR
395/MR
Standard test conditions
25 °C
100.0% of rated power
405 W
395 W
Cool, bright day
40 °C
94.8% of rated power
384 W
374 W
Typical summer roof
55 °C
89.5% of rated power
362 W
354 W
Hot roof
70 °C
84.2% of rated power
341 W
333 W
03
Full specification
Parameter
405/MR
395/MR
Difference
Power and efficiency
Rated power
405 Wp
395 Wp
+10 W for 405/MR
Module efficiency
20.70 %
20.20 %
+0.50 pp for 405/MR
Power density
207.4 Wp/m²
202.3 Wp/m²
+5.1 Wp/m² for 405/MR
Open-circuit voltage
37.23 V
36.98 V
Effectively the same
Voltage at max power
31.21 V
30.84 V
Effectively the same
Short-circuit current
13.87 A
13.70 A
Effectively the same
Current at max power
12.98 A
12.81 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
48.1 kg/kWp
49.4 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
14,005 panels
Against the whole database
Efficiency
#10,764
vs
#11,956
405/MR leads by 1,192 places
Power density
#10,626
vs
#11,887
405/MR leads by 1,261 places
Heat behaviour
#10,419
vs
#10,419
Tied - the same position in the database
Weight
#2,073
vs
#2,878
405/MR leads by 805 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#11,881
vs
#12,239
405/MR leads by 358 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 JAM54S30-405/MR or JA Solar JAM54S30-395/MR?
According to our database: JA Solar JAM54S30-405/MR has higher module efficiency (20.70% vs 20.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM54S30-405/MR and JA Solar JAM54S30-395/MR?
JA Solar JAM54S30-405/MR has a module efficiency of 20.70%, while JA Solar JAM54S30-395/MR is 20.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54S30-405/MR use vs JA Solar JAM54S30-395/MR?
JA Solar JAM54S30-405/MR uses PERC cells; JA Solar JAM54S30-395/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 JAM54S30-405/MR and JA Solar JAM54S30-395/MR?
JA Solar JAM54S30-405/MR has a 25 years power warranty; JA Solar JAM54S30-395/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 390 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.