--- title: "TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK720 - Solar Panel Comparison | ComparePV" description: "Compare TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK720 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-gk705/tcl-zhonghuan-hsm-nd66-gk720" updated: 2026-09-11 --- # TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK720 GK720 leads on the differences that matter The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [TCL Zhonghuan HSM-ND66-GK705](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk705) | [TCL Zhonghuan HSM-ND66-GK720](https://comparepv.com/panel/tcl-zhonghuan-hsm-nd66-gk720) | | Manufacturer | TCL Zhonghuan | TCL Zhonghuan | | Power | 705 Wp | 720 Wp | | Efficiency | 22.70 % | 23.20 % | | Technology | N-type | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | GK705 | GK720 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.70 % | 23.20 % | +0.50 pp for GK720 | | Power density | 227.0 Wp/m² | 231.8 Wp/m² | +4.8 Wp/m² for GK720 | | Rated power | 705 Wp | 720 Wp | +15 W for GK720 | ## Every compared parameter | Parameter | GK705 | GK720 | | --- | --- | --- | | Rated power | 705 Wp | 720 Wp | | Module efficiency | 22.70 % | 23.20 % | | Power density | 227.0 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 48.48 V | 49.14 V | | Voltage at max power | 40.50 V | 41.08 V | | Short-circuit current | 18.44 A | 18.56 A | | Current at max power | 17.41 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 | 54.2 kg/kWp | 53.1 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, 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, GK705:** 23,654 kWh - **Cumulative output, GK720:** 24,157 kWh - **Gap:** 503 kWh ## Output when hot | Condition | Cell temperature | GK705 | GK720 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 705 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 675 W | 690 W | 95.8% of rated power | | Typical summer roof | 55 °C | 646 W | 660 W | 91.6% of rated power | | Hot roof | 70 °C | 616 W | 629 W | 87.4% of rated power | ## Against the whole database | Measure | GK705 | GK720 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,307 | #1,306 | 14,005 | GK720 leads by 2,001 places | | Power density | #3,361 | #1,347 | 14,005 | GK720 leads by 2,014 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #8,415 | #6,810 | 14,005 | GK720 leads by 1,605 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #747 | #339 | 14,005 | GK720 leads by 408 places | ## Questions ### Which panel is better: TCL Zhonghuan HSM-ND66-GK705 or TCL Zhonghuan HSM-ND66-GK720? According to our database: **TCL Zhonghuan HSM-ND66-GK720** has higher module efficiency (**23.20%** vs **22.70%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of TCL Zhonghuan HSM-ND66-GK705 and TCL Zhonghuan HSM-ND66-GK720? **TCL Zhonghuan HSM-ND66-GK705** has a module efficiency of **22.70%**, while **TCL Zhonghuan HSM-ND66-GK720** is **23.20%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does TCL Zhonghuan HSM-ND66-GK705 use vs TCL Zhonghuan HSM-ND66-GK720? **TCL Zhonghuan HSM-ND66-GK705** uses **N-type** cells; **TCL Zhonghuan HSM-ND66-GK720** uses **N-type**. 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-GK705 and TCL Zhonghuan HSM-ND66-GK720? **TCL Zhonghuan HSM-ND66-GK705** has a **30 years** power warranty; **TCL Zhonghuan HSM-ND66-GK720** 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-GK705 and TCL Zhonghuan HSM-ND66-GK720 bifacial panels? Both **TCL Zhonghuan HSM-ND66-GK705** and **TCL Zhonghuan HSM-ND66-GK720** 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-GK705 vs TCL Zhonghuan HSM-ND66-GK725](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk725) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK715](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk715) - 3 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK710](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk710) - One difference: module efficiency - [TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK700](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk700) - One difference: module efficiency - [TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk725-iec1500v) - 4 differences, the largest is module efficiency - [TCL Zhonghuan HSM-ND66-GK705 vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)](https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk720-iec1500v) - 4 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tcl-zhonghuan-hsm-nd66-gk705/tcl-zhonghuan-hsm-nd66-gk720 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.