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600/MR vs 590/MR 16 of 19 identical Swap Change panels

JA Solar JAM78S30-600/MR vs JA Solar JAM78S30-590/MR

JA Solar JAM78S30-600/MR
JAM78S30-600/MR
600 Wp 21.50 % PERC
Open panel page Datasheet PDF
VS
JA Solar JAM78S30-590/MR
JAM78S30-590/MR
590 Wp 21.10 % PERC
Open panel page Datasheet PDF
The verdict

600/MR leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 600/MR 590/MR Difference
Module efficiency 21.50 % 21.10 % 0.40 pp more efficient
Power density 214.6 Wp/m² 211.1 Wp/m² 3.6 Wp/m² higher
Rated power 600 Wp 590 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.
600/MR
19,445 kWh
590/MR
19,121 kWh
Lifetime gap
324 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 600/MR 590/MR
Standard test conditions 25 °C 100.0% of rated power 600 W 590 W
Cool, bright day 40 °C 94.8% of rated power 569 W 559 W
Typical summer roof 55 °C 89.5% of rated power 537 W 528 W
Hot roof 70 °C 84.2% of rated power 506 W 497 W
03

Full specification

Parameter 600/MR 590/MR Difference
Power and efficiency
Rated power 600 Wp 590 Wp +10 W for 600/MR
Module efficiency 21.50 % 21.10 % +0.40 pp for 600/MR
Power density 214.6 Wp/m² 211.1 Wp/m² +3.6 Wp/m² for 600/MR
Open-circuit voltage 53.50 V 53.30 V Effectively the same
Voltage at max power 45.30 V 44.80 V Effectively the same
Short-circuit current 14.03 A 13.93 A Effectively the same
Current at max power 13.25 A 13.17 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2465x1134x35 mm 2465x1134x35 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 30.5 kg 30.5 kg Same
Weight per kWp 50.8 kg/kWp 51.7 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 156 156 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#8,022 vs #9,365
600/MR leads by 1,343 places
Power density
#8,265 vs #9,360
600/MR leads by 1,095 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#4,253 vs #5,108
600/MR leads by 855 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#5,936 vs #6,853
600/MR leads by 917 places
05

More useful comparisons

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JA Solar JAM78S30-600/MR vs JA Solar JAM66D46-740/LB
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JA Solar JAM78S30-600/MR vs JA Solar JAM66D46-735/LB
16 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM78S30-600/MR or JA Solar JAM78S30-590/MR?
According to our database: JA Solar JAM78S30-600/MR has higher module efficiency (21.50% vs 21.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM78S30-600/MR and JA Solar JAM78S30-590/MR?
JA Solar JAM78S30-600/MR has a module efficiency of 21.50%, while JA Solar JAM78S30-590/MR is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM78S30-600/MR use vs JA Solar JAM78S30-590/MR?
JA Solar JAM78S30-600/MR uses PERC cells; JA Solar JAM78S30-590/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 JAM78S30-600/MR and JA Solar JAM78S30-590/MR?
JA Solar JAM78S30-600/MR has a 25 years power warranty; JA Solar JAM78S30-590/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 318 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.