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385/MR/1000V vs 390/MR/1000V 18 of 19 identical Swap Change panels

JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM60S21-390/MR/1000V

JAM60S21-385/MR/1000V
385 Wp 20.70 % PERC
Open panel page Datasheet PDF
VS
JAM60S21-390/MR/1000V
390 Wp 21.00 % PERC
Open panel page Datasheet PDF
The verdict

390/MR/1000V 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 385/MR/1000V 390/MR/1000V Difference
Module efficiency 20.70 % 21.00 % 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.
385/MR/1000V
12,477 kWh
390/MR/1000V
12,640 kWh
Lifetime gap
163 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 385/MR/1000V 390/MR/1000V
Standard test conditions 25 °C 100.0% of rated power 385 W 390 W
Cool, bright day 40 °C 94.8% of rated power 365 W 370 W
Typical summer roof 55 °C 89.5% of rated power 345 W 349 W
Hot roof 70 °C 84.2% of rated power 324 W 329 W
03

Full specification

Parameter 385/MR/1000V 390/MR/1000V Difference
Power and efficiency
Rated power 385 Wp 390 Wp Effectively the same
Module efficiency 20.70 % 21.00 % +0.30 pp for 390/MR/1000V
Power density 206.9 Wp/m² 209.6 Wp/m² Effectively the same
Open-circuit voltage 41.78 V 41.94 V Effectively the same
Voltage at max power 35.04 V 35.33 V Effectively the same
Short-circuit current 11.53 A 11.58 A Effectively the same
Current at max power 10.99 A 11.04 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 1769x1052x30 mm 1769x1052x30 mm Same
Module area 1.861 m² 1.861 m² Same
Weight 18.8 kg 18.8 kg Same
Weight per kWp 48.8 kg/kWp 48.2 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 120 120 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#10,842 vs #9,828
390/MR/1000V leads by 1,014 places
Power density
#10,986 vs #10,005
390/MR/1000V leads by 981 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#2,497 vs #2,106
390/MR/1000V leads by 391 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#12,265 vs #12,055
390/MR/1000V leads by 210 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM60S21-380/MR/1000V
One difference: module efficiency
Same series, other bin
JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM60S21-375/MR/1000V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM60S21-370/MR/1000V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM60S21-365/MR/1000V
5 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM66D46-740/LB
17 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM60S21-385/MR/1000V vs JA Solar JAM66D46-735/LB
17 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM60S21-385/MR/1000V or JA Solar JAM60S21-390/MR/1000V?
According to our database: JA Solar JAM60S21-390/MR/1000V has higher module efficiency (21.00% vs 20.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM60S21-385/MR/1000V and JA Solar JAM60S21-390/MR/1000V?
JA Solar JAM60S21-385/MR/1000V has a module efficiency of 20.70%, while JA Solar JAM60S21-390/MR/1000V is 21.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM60S21-385/MR/1000V use vs JA Solar JAM60S21-390/MR/1000V?
JA Solar JAM60S21-385/MR/1000V uses PERC cells; JA Solar JAM60S21-390/MR/1000V 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 JAM60S21-385/MR/1000V and JA Solar JAM60S21-390/MR/1000V?
JA Solar JAM60S21-385/MR/1000V has a 25 years power warranty; JA Solar JAM60S21-390/MR/1000V 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 330 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.