--- title: "TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) - Solar Panel Comparison | ComparePV" description: "Compare TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) 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-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk720-iec1500v" updated: 2026-09-11 --- # TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) Identical on every published parameter All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. 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 | [TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk715-iec1500v) | [TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk720-iec1500v) | | Manufacturer | TCL Zhonghuan | TCL Zhonghuan | | Power | 715 Wp | 720 Wp | | Efficiency | 22.90 % | 23.00 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | GK715 (IEC1500V) | GK720 (IEC1500V) | | --- | --- | --- | | Rated power | 715 Wp | 720 Wp | | Module efficiency | 22.90 % | 23.00 % | | Power density | 230.2 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 48.92 V | 49.14 V | | Voltage at max power | 40.89 V | 41.08 V | | Short-circuit current | 18.52 A | 18.56 A | | Current at max power | 17.49 A | 17.53 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 | 53.4 kg/kWp | 53.1 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, GK715 (IEC1500V):** 23,990 kWh - **Cumulative output, GK720 (IEC1500V):** 24,157 kWh - **Gap:** 167 kWh ## Output when hot | Condition | Cell temperature | GK715 (IEC1500V) | GK720 (IEC1500V) | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 715 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 685 W | 690 W | 95.8% of rated power | | Typical summer roof | 55 °C | 655 W | 660 W | 91.6% of rated power | | Hot roof | 70 °C | 625 W | 629 W | 87.4% of rated power | ## Against the whole database | Measure | GK715 (IEC1500V) | GK720 (IEC1500V) | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,359 | #1,919 | 14,005 | GK720 (IEC1500V) leads by 440 places | | Power density | #2,018 | #1,347 | 14,005 | GK720 (IEC1500V) leads by 671 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #7,356 | #6,810 | 14,005 | GK720 (IEC1500V) leads by 546 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #496 | #391 | 14,005 | GK720 (IEC1500V) leads by 105 places | ## Questions ### Which panel is better: TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) or TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? According to our database: **TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)** has higher module efficiency (**23.00%** vs **22.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? **TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)** has a module efficiency of **22.90%**, 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-ND66-GK715 (IEC1500V) use vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? **TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)** uses **TOPCon** 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-ND66-GK715 (IEC1500V) and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)? **TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)** 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-ND66-GK715 (IEC1500V) and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) bifacial panels? Both **TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)** and **TCL Zhonghuan HSM-ND66-GK720 (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-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk725-iec1500v) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk725) - 4 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk720) - 2 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk715) - One difference: cell technology - [TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK710](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk710) - One difference: cell technology - [TCL Zhonghuan HSM-ND66-GK715 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK710 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/tcl-zhonghuan-hsm-nd66-gk710-iec1500v) - The same specification on paper --- Source: https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk715-iec1500v/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.