Skip to main content
590/MR vs 605/MR 16 of 19 identical Swap Change panels

JA Solar JAM78S30-590/MR vs JA Solar JAM78S30-605/MR

JA Solar JAM78S30-590/MR
JAM78S30-590/MR
590 Wp 21.10 % PERC
Open panel page Datasheet PDF
VS
JA Solar JAM78S30-605/MR
JAM78S30-605/MR
605 Wp 21.60 % PERC
Open panel page Datasheet PDF
The verdict

605/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 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 590/MR 605/MR Difference
Module efficiency 21.10 % 21.60 % 0.50 pp more efficient
Power density 211.1 Wp/m² 216.4 Wp/m² 5.4 Wp/m² higher
Rated power 590 Wp 605 Wp 15 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.
590/MR
19,121 kWh
605/MR
19,607 kWh
Lifetime gap
486 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 590/MR 605/MR
Standard test conditions 25 °C 100.0% of rated power 590 W 605 W
Cool, bright day 40 °C 94.8% of rated power 559 W 573 W
Typical summer roof 55 °C 89.5% of rated power 528 W 541 W
Hot roof 70 °C 84.2% of rated power 497 W 510 W
03

Full specification

Parameter 590/MR 605/MR Difference
Power and efficiency
Rated power 590 Wp 605 Wp +15 W for 605/MR
Module efficiency 21.10 % 21.60 % +0.50 pp for 605/MR
Power density 211.1 Wp/m² 216.4 Wp/m² +5.4 Wp/m² for 605/MR
Open-circuit voltage 53.30 V 53.61 V Effectively the same
Voltage at max power 44.80 V 45.53 V Effectively the same
Short-circuit current 13.93 A 14.08 A Effectively the same
Current at max power 13.17 A 13.29 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 51.7 kg/kWp 50.4 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 156 156 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#9,365 vs #7,716
605/MR leads by 1,649 places
Power density
#9,360 vs #7,665
605/MR leads by 1,695 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#5,108 vs #3,809
605/MR leads by 1,299 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#6,853 vs #5,638
605/MR leads by 1,215 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM78S30-590/MR vs JA Solar JAM78S30-600/MR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78S30-590/MR vs JA Solar JAM78S30-595/MR
One difference: module efficiency
Same series, other bin
JA Solar JAM78S30-590/MR vs JA Solar JAM78S30-585/MR
One difference: module efficiency
Same series, other bin
JA Solar JAM78S30-590/MR vs JA Solar JAM78S30-580/MR
3 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM78S30-590/MR vs JA Solar JAM66D46-740/LB
16 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM78S30-590/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 JAM78S30-590/MR or JA Solar JAM78S30-605/MR?
According to our database: JA Solar JAM78S30-605/MR has higher module efficiency (21.60% 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 JAM78S30-590/MR and JA Solar JAM78S30-605/MR?
JA Solar JAM78S30-590/MR has a module efficiency of 21.10%, while JA Solar JAM78S30-605/MR is 21.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM78S30-590/MR use vs JA Solar JAM78S30-605/MR?
JA Solar JAM78S30-590/MR uses PERC cells; JA Solar JAM78S30-605/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 JAM78S30-590/MR and JA Solar JAM78S30-605/MR?
JA Solar JAM78S30-590/MR has a 25 years power warranty; JA Solar JAM78S30-605/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.