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590 vs 580 14 of 19 identical Swap Change panels

BYD NLBK-36 590 vs BYD NLBK-36 580

BYD NLBK-36 590
BYD
NLBK-36 590
590 Wp 22.84 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
BYD NLBK-36 580
BYD
NLBK-36 580
580 Wp 22.45 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

590 leads on the differences that matter

The largest is module efficiency: 0.39 pp more efficient. 14 of 19 comparable parameters are identical.

See all 5 differences
How alike are they
14 of 19 comparable
parameters are identical
identical differs
01

What actually differs

5 of 19 parameters
Parameter 590 580 Difference
Module efficiency 22.84 % 22.45 % 0.39 pp more efficient
Power density 228.4 Wp/m² 224.5 Wp/m² 3.9 Wp/m² higher
Rated power 590 Wp 580 Wp 10 W more power
Open-circuit voltage 53.92 V 52.69 V 1.23 V apart
Voltage at max power 45.04 V 43.18 V 1.86 V apart
02

What it means on a roof

Thirty years of production
Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.278 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
590
19,796 kWh
580
19,460 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 590 580
Standard test conditions 25 °C 100.0% of rated power 590 W 580 W
Cool, bright day 40 °C 95.8% of rated power 565 W 556 W
Typical summer roof 55 °C 91.7% of rated power 541 W 532 W
Hot roof 70 °C 87.5% of rated power 516 W 507 W
03

Full specification

Parameter 590 580 Difference
Power and efficiency
Rated power 590 Wp 580 Wp +10 W for 590
Module efficiency 22.84 % 22.45 % +0.39 pp for 590
Power density 228.4 Wp/m² 224.5 Wp/m² +3.9 Wp/m² for 590
Open-circuit voltage 53.92 V 52.69 V 1.23 V apart
Voltage at max power 45.04 V 43.18 V 1.86 V apart
Short-circuit current 13.56 A 13.86 A Effectively the same
Current at max power 13.10 A 13.43 A Effectively the same
Temperature
Temperature coefficient -0.278 %/°C -0.278 %/°C Same
Mechanical
Dimensions 2278x1134x30 mm 2278x1134x30 mm Same
Module area 2.583 m² 2.583 m² Same
Weight 32.0 kg 32.0 kg Same
Weight per kWp 54.2 kg/kWp 55.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#2,617 vs #4,620
590 leads by 2,003 places
Power density
#2,598 vs #4,547
590 leads by 1,949 places
Heat behaviour
#1,295 vs #1,295
Tied - the same position in the database
Weight
#8,477 vs #9,588
590 leads by 1,111 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,762 vs #4,564
590 leads by 802 places
05

More useful comparisons

Open the full database
Same series, other bin
BYD
BYD NLBK-36 590 vs BYD NLBK-36 600
3 differences, the largest is module efficiency
Same series, other bin
BYD
BYD NLBK-36 590 vs BYD NLBK-36 595
The same specification on paper
Same series, other bin
BYD
BYD NLBK-36 590 vs BYD NLBK-36 585
The same specification on paper
Same series, other bin
BYD
BYD NLBK-36 590 vs BYD NLBK-36 575
5 differences, the largest is module efficiency
Same series, other bin
BYD
BYD NLBK-36 590 vs BYD NLBK-36 570
5 differences, the largest is module efficiency
Same manufacturer
BYD
BYD NLBK-36 590 vs BYD HSBK-33-735
14 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: BYD NLBK-36 590 or BYD NLBK-36 580?
According to our database: BYD NLBK-36 590 has higher module efficiency (22.84% vs 22.45%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of BYD NLBK-36 590 and BYD NLBK-36 580?
BYD NLBK-36 590 has a module efficiency of 22.84%, while BYD NLBK-36 580 is 22.45%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does BYD NLBK-36 590 use vs BYD NLBK-36 580?
BYD NLBK-36 590 uses TOPCon cells; BYD NLBK-36 580 uses TOPCon. 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 BYD NLBK-36 590 and BYD NLBK-36 580?
BYD NLBK-36 590 has a 30 years power warranty; BYD NLBK-36 580 has a 30 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.
Are BYD NLBK-36 590 and BYD NLBK-36 580 bifacial panels?
Both BYD NLBK-36 590 and BYD NLBK-36 580 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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.