--- title: "TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) - Solar Panel Comparison | ComparePV" description: "Compare TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/tcl-zhonghuan-hsm-bd54-wa475/tcl-zhonghuan-hsm-nd66-gk720-iec1500v" updated: 2026-09-11 --- # TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) BD54-WA475 leads on the differences that matter The largest is module efficiency: 0.80 pp more efficient. 2 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [TCL Zhonghuan HSM-BD54-WA475](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-wa475) | [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk720-iec1500v) | | Manufacturer | TCL Zhonghuan | TCL Zhonghuan | | Power | 475 Wp | 720 Wp | | Efficiency | 23.80 % | 23.00 % | | Technology | Back Contact | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | BD54-WA475 | ND66-GK720 (IEC1500V) | Difference | | --- | --- | --- | --- | | Module efficiency | 23.80 % | 23.00 % | +0.80 pp for BD54-WA475 | | Rated power | 475 Wp | 720 Wp | +245 W for ND66-GK720 (IEC1500V) | | Weight | 21.5 kg | 38.2 kg | -16.7 kg for BD54-WA475 | | Product warranty | 25 yrs | 15 yrs | +10 yrs for BD54-WA475 | | Weight per kWp | 45.3 kg/kWp | 53.1 kg/kWp | -7.8 kg/kWp for BD54-WA475 | | Temperature coefficient | -0.260 %/°C | -0.280 %/°C | +0.020 %/°C for BD54-WA475 | | Power density | 238.4 Wp/m² | 231.8 Wp/m² | +6.6 Wp/m² for BD54-WA475 | | Open-circuit voltage | 41.24 V | 49.14 V | 7.90 V apart | | Short-circuit current | 14.35 A | 18.56 A | 4.21 A apart | | Module area | 1.992 m² | 3.106 m² | 1.114 m² apart | | Cell technology | Back Contact | TOPCon | Back Contact vs TOPCon | | Voltage at max power | 34.80 V | 41.08 V | 6.28 V apart | | Current at max power | 13.66 A | 17.53 A | 3.87 A apart | | Cell count | 108 | 132 | 24 cells apart | | Bifacial | No | Yes | No vs Yes | | Dimensions | 1757x1134x30 mm | 2384x1303x33 mm | 1757x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | BD54-WA475 | ND66-GK720 (IEC1500V) | | --- | --- | --- | | Rated power | 475 Wp | 720 Wp | | Module efficiency | 23.80 % | 23.00 % | | Power density | 238.4 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 41.24 V | 49.14 V | | Voltage at max power | 34.80 V | 41.08 V | | Short-circuit current | 14.35 A | 18.56 A | | Current at max power | 13.66 A | 17.53 A | | Temperature coefficient | -0.260 %/°C | -0.280 %/°C | | Dimensions | 1757x1134x30 mm | 2384x1303x33 mm | | Module area | 1.992 m² | 3.106 m² | | Weight | 21.5 kg | 38.2 kg | | Weight per kWp | 45.3 kg/kWp | 53.1 kg/kWp | | Product warranty | 25 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | - | | Cell technology | Back Contact | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 132 | | Bifacial | No | Yes | ## Thirty-year yield Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year - **Cumulative output, BD54-WA475:** 15,937 kWh - **Cumulative output, ND66-GK720 (IEC1500V):** 24,157 kWh - **Gap:** 8,220 kWh ## Output when hot | Condition | Cell temperature | BD54-WA475 | ND66-GK720 (IEC1500V) | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 475 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 456 W | 690 W | 95.8% of rated power | | Typical summer roof | 55 °C | 438 W | 660 W | 91.6% of rated power | | Hot roof | 70 °C | 419 W | 629 W | 87.4% of rated power | ## Against the whole database | Measure | BD54-WA475 | ND66-GK720 (IEC1500V) | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #433 | #1,919 | 14,005 | BD54-WA475 leads by 1,486 places | | Power density | #417 | #1,347 | 14,005 | BD54-WA475 leads by 930 places | | Heat behaviour | #511 | #1,309 | 14,005 | BD54-WA475 leads by 798 places | | Weight | #669 | #6,810 | 14,005 | BD54-WA475 leads by 6,141 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,753 | #391 | 14,005 | ND66-GK720 (IEC1500V) leads by 3,362 places | ## Questions ### Which panel is better: TCL Zhonghuan HSM-BD54-WA475 or TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? According to our database: **TCL Zhonghuan HSM-BD54-WA475** has higher module efficiency (**23.80%** vs **23.00%**); **TCL Zhonghuan HSM-BD54-WA475** tolerates heat better (temp coeff **-0.260%/°C** vs **-0.280%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of TCL Zhonghuan HSM-BD54-WA475 and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? **TCL Zhonghuan HSM-BD54-WA475** has a module efficiency of **23.80%**, while **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** is **23.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does TCL Zhonghuan HSM-BD54-WA475 use vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? **TCL Zhonghuan HSM-BD54-WA475** uses **Back Contact** cells; **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** 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 TCL Zhonghuan HSM-BD54-WA475 and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? **TCL Zhonghuan HSM-BD54-WA475** has a **30 years** power warranty; **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** 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 TCL Zhonghuan HSM-BD54-WA475 and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) bifacial panels? **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** is bifacial (captures light from both faces); **TCL Zhonghuan HSM-BD54-WA475** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-BD54-WA470](https://comparepv.com/compare/tcl-zhonghuan-hsm-bd54-wa475/tcl-zhonghuan-hsm-bd54-wa470) - One difference: module efficiency - [TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-BD54-WA465](https://comparepv.com/compare/tcl-zhonghuan-hsm-bd54-wa475/tcl-zhonghuan-hsm-bd54-wa465) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-BD54-WA460](https://comparepv.com/compare/tcl-zhonghuan-hsm-bd54-wa475/tcl-zhonghuan-hsm-bd54-wa460) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk725-iec1500v) - One difference: module efficiency - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk725) - 2 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk720) - 2 differences, the largest is cell technology --- Source: https://comparepv.com/compare/tcl-zhonghuan-hsm-bd54-wa475/tcl-zhonghuan-hsm-nd66-gk720-iec1500v 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.