--- title: "TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) - Solar Panel Comparison | ComparePV" description: "Compare TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) 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-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk725-iec1500v" updated: 2026-09-11 --- # TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) GK725 (IEC1500V) leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 17 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-ND66-GK720 (IEC1500V)](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk720-iec1500v) | [TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk725-iec1500v) | | Manufacturer | TCL Zhonghuan | TCL Zhonghuan | | Power | 720 Wp | 725 Wp | | Efficiency | 23.00 % | 23.30 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | GK720 (IEC1500V) | GK725 (IEC1500V) | Difference | | --- | --- | --- | --- | | Module efficiency | 23.00 % | 23.30 % | +0.30 pp for GK725 (IEC1500V) | ## Every compared parameter | Parameter | GK720 (IEC1500V) | GK725 (IEC1500V) | | --- | --- | --- | | Rated power | 720 Wp | 725 Wp | | Module efficiency | 23.00 % | 23.30 % | | Power density | 231.8 Wp/m² | 233.4 Wp/m² | | Open-circuit voltage | 49.14 V | 49.36 V | | Voltage at max power | 41.08 V | 41.27 V | | Short-circuit current | 18.56 A | 18.60 A | | Current at max power | 17.53 A | 17.57 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.2 kg | 38.2 kg | | Weight per kWp | 53.1 kg/kWp | 52.7 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | - | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 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 Same temp coeff. for both panels (-0.280 %/°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, GK720 (IEC1500V):** 24,157 kWh - **Cumulative output, GK725 (IEC1500V):** 24,325 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | GK720 (IEC1500V) | GK725 (IEC1500V) | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 725 W | 100.0% of rated power | | Cool, bright day | 40 °C | 690 W | 695 W | 95.8% of rated power | | Typical summer roof | 55 °C | 660 W | 664 W | 91.6% of rated power | | Hot roof | 70 °C | 629 W | 634 W | 87.4% of rated power | ## Against the whole database | Measure | GK720 (IEC1500V) | GK725 (IEC1500V) | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,919 | #1,017 | 14,005 | GK725 (IEC1500V) leads by 902 places | | Power density | #1,347 | #936 | 14,005 | GK725 (IEC1500V) leads by 411 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #6,810 | #6,337 | 14,005 | GK725 (IEC1500V) leads by 473 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #391 | #266 | 14,005 | GK725 (IEC1500V) leads by 125 places | ## Questions ### Which panel is better: TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) or TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? According to our database: **TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)** has higher module efficiency (**23.30%** vs **23.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** has a module efficiency of **23.00%**, 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-ND66-GK720 (IEC1500V) use vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** 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-ND66-GK720 (IEC1500V) and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)? **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** 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-ND66-GK720 (IEC1500V) and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) bifacial panels? Both **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** 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-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 - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk715-iec1500v) - The same specification on paper - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk715) - One difference: cell technology - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK710](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk710) - 3 differences, the largest is cell technology - [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK710 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/tcl-zhonghuan-hsm-nd66-gk710-iec1500v) - 2 differences, the largest is power density --- Source: https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk720-iec1500v/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.