--- title: "TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) - Solar Panel Comparison | ComparePV" description: "Compare TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND66-GK725 (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-nd54-gr505/tcl-zhonghuan-hsm-nd66-gk725-iec1500v" updated: 2026-09-11 --- # TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) ND66-GK725 (IEC1500V) leads on the differences that matter The largest is rated power: 220 W more power. 5 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-ND54-GR505](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd54-gr505) | [TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk725-iec1500v) | | Manufacturer | TCL Zhonghuan | TCL Zhonghuan | | Power | 505 Wp | 725 Wp | | Efficiency | 22.70 % | 23.30 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | ND54-GR505 | ND66-GK725 (IEC1500V) | Difference | | --- | --- | --- | --- | | Rated power | 505 Wp | 725 Wp | +220 W for ND66-GK725 (IEC1500V) | | Module efficiency | 22.70 % | 23.30 % | +0.60 pp for ND66-GK725 (IEC1500V) | | Weight | 27.0 kg | 38.2 kg | -11.2 kg for ND54-GR505 | | Product warranty | 25 yrs | 15 yrs | +10 yrs for ND54-GR505 | | Power density | 227.1 Wp/m² | 233.4 Wp/m² | +6.3 Wp/m² for ND66-GK725 (IEC1500V) | | Open-circuit voltage | 40.14 V | 49.36 V | 9.22 V apart | | Short-circuit current | 15.88 A | 18.60 A | 2.72 A apart | | Module area | 2.224 m² | 3.106 m² | 0.883 m² apart | | Temperature coefficient | -0.290 %/°C | -0.280 %/°C | +0.010 %/°C for ND66-GK725 (IEC1500V) | | Voltage at max power | 33.90 V | 41.27 V | 7.37 V apart | | Current at max power | 14.90 A | 17.57 A | 2.67 A apart | | Cell count | 108 | 132 | 24 cells apart | | Dimensions | 1961x1134x30 mm | 2384x1303x33 mm | 1961x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | ND54-GR505 | ND66-GK725 (IEC1500V) | | --- | --- | --- | | Rated power | 505 Wp | 725 Wp | | Module efficiency | 22.70 % | 23.30 % | | Power density | 227.1 Wp/m² | 233.4 Wp/m² | | Open-circuit voltage | 40.14 V | 49.36 V | | Voltage at max power | 33.90 V | 41.27 V | | Short-circuit current | 15.88 A | 18.60 A | | Current at max power | 14.90 A | 17.57 A | | Temperature coefficient | -0.290 %/°C | -0.280 %/°C | | Dimensions | 1961x1134x30 mm | 2384x1303x33 mm | | Module area | 2.224 m² | 3.106 m² | | Weight | 27.0 kg | 38.2 kg | | Weight per kWp | 53.5 kg/kWp | 52.7 kg/kWp | | Product warranty | 25 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | - | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 132 | | Bifacial | Yes | 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, ND54-GR505:** 16,944 kWh - **Cumulative output, ND66-GK725 (IEC1500V):** 24,325 kWh - **Gap:** 7,381 kWh ## Output when hot | Condition | Cell temperature | ND54-GR505 | ND66-GK725 (IEC1500V) | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 505 W | 725 W | 100.0% of rated power | | Cool, bright day | 40 °C | 483 W | 695 W | 95.7% of rated power | | Typical summer roof | 55 °C | 461 W | 664 W | 91.3% of rated power | | Hot roof | 70 °C | 439 W | 634 W | 87.0% of rated power | ## Against the whole database | Measure | ND54-GR505 | ND66-GK725 (IEC1500V) | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,307 | #1,017 | 14,005 | ND66-GK725 (IEC1500V) leads by 2,290 places | | Power density | #3,312 | #936 | 14,005 | ND66-GK725 (IEC1500V) leads by 2,376 places | | Heat behaviour | #2,165 | #1,309 | 14,005 | ND66-GK725 (IEC1500V) leads by 856 places | | Weight | #7,409 | #6,337 | 14,005 | ND66-GK725 (IEC1500V) leads by 1,072 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,152 | #266 | 14,005 | ND66-GK725 (IEC1500V) leads by 3,886 places | ## Questions ### Which panel is better: TCL Zhonghuan HSM-ND54-GR505 or TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? According to our database: **TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)** has higher module efficiency (**23.30%** vs **22.70%**); **TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)** tolerates heat better (temp coeff **-0.280%/°C** vs **-0.290%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of TCL Zhonghuan HSM-ND54-GR505 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? **TCL Zhonghuan HSM-ND54-GR505** has a module efficiency of **22.70%**, while **TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)** is **23.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does TCL Zhonghuan HSM-ND54-GR505 use vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? **TCL Zhonghuan HSM-ND54-GR505** uses **TOPCon** cells; **TCL Zhonghuan HSM-ND66-GK725 (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-ND54-GR505 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? **TCL Zhonghuan HSM-ND54-GR505** has a **30 years** power warranty; **TCL Zhonghuan HSM-ND66-GK725 (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-ND54-GR505 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) bifacial panels? Both **TCL Zhonghuan HSM-ND54-GR505** and **TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)** 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 - [TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND54-GR515](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd54-gr505/tcl-zhonghuan-hsm-nd54-gr515) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND54-GR510](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd54-gr505/tcl-zhonghuan-hsm-nd54-gr510) - One difference: module efficiency - [TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND54-GR500](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd54-gr505/tcl-zhonghuan-hsm-nd54-gr500) - One difference: module efficiency - [TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND54-GR495](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd54-gr505/tcl-zhonghuan-hsm-nd54-gr495) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND54-GR505 vs TCL Zhonghuan HSM-ND54-GR490](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd54-gr505/tcl-zhonghuan-hsm-nd54-gr490) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk725-iec1500v/tcl-zhonghuan-hsm-nd66-gk725) - One difference: cell technology --- Source: https://comparepv.com/compare/tcl-zhonghuan-hsm-nd54-gr505/tcl-zhonghuan-hsm-nd66-gk725-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.