--- title: "BYD NLBK-36 585 vs BYD NLBK-36 590 - Solar Panel Comparison | ComparePV" description: "Compare BYD NLBK-36 585 vs BYD NLBK-36 590 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-590" updated: 2026-09-11 --- # BYD NLBK-36 585 vs BYD NLBK-36 590 Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [BYD NLBK-36 585](https://comparepv.com/panel/byd-nlbk-36-585) | [BYD NLBK-36 590](https://comparepv.com/panel/byd-nlbk-36-590) | | Manufacturer | BYD | BYD | | Power | 585 Wp | 590 Wp | | Efficiency | 22.65 % | 22.84 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | 585 | 590 | | --- | --- | --- | | Rated power | 585 Wp | 590 Wp | | Module efficiency | 22.65 % | 22.84 % | | Power density | 226.5 Wp/m² | 228.4 Wp/m² | | Open-circuit voltage | 53.82 V | 53.92 V | | Voltage at max power | 44.90 V | 45.04 V | | Short-circuit current | 13.49 A | 13.56 A | | Current at max power | 13.03 A | 13.10 A | | Temperature coefficient | -0.278 %/°C | -0.278 %/°C | | Dimensions | 2278x1134x30 mm | 2278x1134x30 mm | | Module area | 2.583 m² | 2.583 m² | | Weight | 32.0 kg | 32.0 kg | | Weight per kWp | 54.7 kg/kWp | 54.2 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | Bifacial | Yes | Yes | ## Thirty-year yield 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. - **Cumulative output, 585:** 19,628 kWh - **Cumulative output, 590:** 19,796 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 585 | 590 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 585 W | 590 W | 100.0% of rated power | | Cool, bright day | 40 °C | 561 W | 565 W | 95.8% of rated power | | Typical summer roof | 55 °C | 536 W | 541 W | 91.7% of rated power | | Hot roof | 70 °C | 512 W | 516 W | 87.5% of rated power | ## Against the whole database | Measure | 585 | 590 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,522 | #2,617 | 14,005 | 590 leads by 905 places | | Power density | #3,500 | #2,598 | 14,005 | 590 leads by 902 places | | Heat behaviour | #1,295 | #1,295 | 14,005 | Tied - the same position in the database | | Weight | #9,081 | #8,477 | 14,005 | 590 leads by 604 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,127 | #3,762 | 14,005 | 590 leads by 365 places | ## Questions ### Which panel is better: BYD NLBK-36 585 or BYD NLBK-36 590? According to our database: **BYD NLBK-36 590** has higher module efficiency (**22.84%** vs **22.65%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of BYD NLBK-36 585 and BYD NLBK-36 590? **BYD NLBK-36 585** has a module efficiency of **22.65%**, while **BYD NLBK-36 590** is **22.84%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does BYD NLBK-36 585 use vs BYD NLBK-36 590? **BYD NLBK-36 585** uses **TOPCon** cells; **BYD NLBK-36 590** 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-36 585 and BYD NLBK-36 590? **BYD NLBK-36 585** has a **30 years** power warranty; **BYD NLBK-36 590** 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-36 585 and BYD NLBK-36 590 bifacial panels? Both **BYD NLBK-36 585** and **BYD NLBK-36 590** 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. ## Related comparisons - [BYD NLBK-36 585 vs BYD NLBK-36 600](https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-600) - 3 differences, the largest is module efficiency - [BYD NLBK-36 585 vs BYD NLBK-36 595](https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-595) - 3 differences, the largest is module efficiency - [BYD NLBK-36 585 vs BYD NLBK-36 580](https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-580) - 3 differences, the largest is module efficiency - [BYD NLBK-36 585 vs BYD NLBK-36 575](https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-575) - 5 differences, the largest is module efficiency - [BYD NLBK-36 585 vs BYD NLBK-36 570](https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-570) - 5 differences, the largest is module efficiency - [BYD NLBK-36 585 vs BYD HSBK-33-735](https://comparepv.com/compare/byd-nlbk-36-585/byd-hsbk-33-735) - 14 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/byd-nlbk-36-585/byd-nlbk-36-590 Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.