JA Solar JAM54S30-395/MR vs JA Solar JAM54S30-390/MR
VS
The verdict
395/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 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
395/MR
390/MR
Difference
Module efficiency
20.20 %
20.00 %
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.
395/MR
12,802 kWh
390/MR
12,640 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
395/MR
390/MR
Standard test conditions
25 °C
100.0% of rated power
395 W
390 W
Cool, bright day
40 °C
94.8% of rated power
374 W
370 W
Typical summer roof
55 °C
89.5% of rated power
354 W
349 W
Hot roof
70 °C
84.2% of rated power
333 W
329 W
03
Full specification
Parameter
395/MR
390/MR
Difference
Power and efficiency
Rated power
395 Wp
390 Wp
Effectively the same
Module efficiency
20.20 %
20.00 %
+0.20 pp for 395/MR
Power density
202.3 Wp/m²
199.7 Wp/m²
Effectively the same
Open-circuit voltage
36.98 V
36.85 V
Effectively the same
Voltage at max power
30.84 V
30.64 V
Effectively the same
Short-circuit current
13.70 A
13.61 A
Effectively the same
Current at max power
12.81 A
12.73 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
49.4 kg/kWp
50.0 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
#11,956
vs
#12,214
395/MR leads by 258 places
Power density
#11,887
vs
#12,255
395/MR leads by 368 places
Heat behaviour
#10,419
vs
#10,419
Tied - the same position in the database
Weight
#2,878
vs
#3,317
395/MR leads by 439 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#12,239
vs
#12,390
395/MR leads by 151 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 JAM54S30-395/MR or JA Solar JAM54S30-390/MR?
According to our database: JA Solar JAM54S30-395/MR has higher module efficiency (20.20% 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 JAM54S30-395/MR and JA Solar JAM54S30-390/MR?
JA Solar JAM54S30-395/MR has a module efficiency of 20.20%, while JA Solar JAM54S30-390/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 JAM54S30-395/MR use vs JA Solar JAM54S30-390/MR?
JA Solar JAM54S30-395/MR uses PERC cells; JA Solar JAM54S30-390/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 JAM54S30-395/MR and JA Solar JAM54S30-390/MR?
JA Solar JAM54S30-395/MR has a 25 years power warranty; JA Solar JAM54S30-390/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.