--- title: "Horay Solar HS645TC-MHD-D vs Horay Solar HS720TC-MHG-D - Solar Panel Comparison | ComparePV" description: "Compare Horay Solar HS645TC-MHD-D vs Horay Solar HS720TC-MHG-D side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/horay-solar-hs645tc-mhd-d/horay-solar-hs720tc-mhg-d" updated: 2026-09-11 --- # Horay Solar HS645TC-MHD-D vs Horay Solar HS720TC-MHG-D 9 differences, and they point both ways The largest is rated power: 75 W more power. 9 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 | [Horay Solar HS645TC-MHD-D](https://comparepv.com/panel/horay-solar-hs645tc-mhd-d) | [Horay Solar HS720TC-MHG-D](https://comparepv.com/panel/horay-solar-hs720tc-mhg-d) | | Manufacturer | Horay Solar | Horay Solar | | Power | 645 Wp | 720 Wp | | Efficiency | 23.10 % | 23.20 % | | Technology | N-type | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | HS645TC-MHD-D | HS720TC-MHG-D | Difference | | --- | --- | --- | --- | | Rated power | 645 Wp | 720 Wp | +75 W for HS720TC-MHG-D | | Weight | 34.5 kg | 38.5 kg | -4.0 kg for HS645TC-MHD-D | | Module area | 2.795 m² | 3.106 m² | 0.311 m² apart | | Short-circuit current | 16.81 A | 18.49 A | 1.68 A apart | | Cell technology | N-type | TOPCon | N-type vs TOPCon | | Cell count | 144 | 132 | 12 cells apart | | Current at max power | 15.79 A | 17.44 A | 1.65 A apart | | Open-circuit voltage | 48.16 V | 49.40 V | 1.24 V apart | | Dimensions | 2465x1134x30 mm | 2384x1303x33 mm | 2465x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | HS645TC-MHD-D | HS720TC-MHG-D | | --- | --- | --- | | Rated power | 645 Wp | 720 Wp | | Module efficiency | 23.10 % | 23.20 % | | Power density | 230.7 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 48.16 V | 49.40 V | | Voltage at max power | 40.85 V | 41.30 V | | Short-circuit current | 16.81 A | 18.49 A | | Current at max power | 15.79 A | 17.44 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2465x1134x30 mm | 2384x1303x33 mm | | Module area | 2.795 m² | 3.106 m² | | Weight | 34.5 kg | 38.5 kg | | Weight per kWp | 53.5 kg/kWp | 53.5 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | - | | Cell technology | N-type | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 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, HS645TC-MHD-D:** 21,641 kWh - **Cumulative output, HS720TC-MHG-D:** 24,157 kWh - **Gap:** 2,516 kWh ## Output when hot | Condition | Cell temperature | HS645TC-MHD-D | HS720TC-MHG-D | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 645 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 618 W | 690 W | 95.8% of rated power | | Typical summer roof | 55 °C | 591 W | 660 W | 91.6% of rated power | | Hot roof | 70 °C | 564 W | 629 W | 87.4% of rated power | ## Against the whole database | Measure | HS645TC-MHD-D | HS720TC-MHG-D | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,570 | #1,306 | 14,005 | HS720TC-MHG-D leads by 264 places | | Power density | #1,654 | #1,347 | 14,005 | HS720TC-MHG-D leads by 307 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #7,451 | #7,424 | 14,005 | HS720TC-MHG-D leads by 27 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,496 | #350 | 14,005 | HS720TC-MHG-D leads by 1,146 places | ## Questions ### Which panel is better: Horay Solar HS645TC-MHD-D or Horay Solar HS720TC-MHG-D? According to our database: **Horay Solar HS720TC-MHG-D** has higher module efficiency (**23.20%** vs **23.10%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Horay Solar HS645TC-MHD-D and Horay Solar HS720TC-MHG-D? **Horay Solar HS645TC-MHD-D** has a module efficiency of **23.10%**, while **Horay Solar HS720TC-MHG-D** is **23.20%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Horay Solar HS645TC-MHD-D use vs Horay Solar HS720TC-MHG-D? **Horay Solar HS645TC-MHD-D** uses **N-type** cells; **Horay Solar HS720TC-MHG-D** 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 Horay Solar HS645TC-MHD-D and Horay Solar HS720TC-MHG-D? **Horay Solar HS645TC-MHD-D** has a **30 years** power warranty; **Horay Solar HS720TC-MHG-D** 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 Horay Solar HS645TC-MHD-D and Horay Solar HS720TC-MHG-D bifacial panels? Both **Horay Solar HS645TC-MHD-D** and **Horay Solar HS720TC-MHG-D** 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 - [Horay Solar HS645TC-MHD-D vs Horay Solar HS650TC-MHD-D](https://comparepv.com/compare/horay-solar-hs645tc-mhd-d/horay-solar-hs650tc-mhd-d) - One difference: module efficiency - [Horay Solar HS645TC-MHD-D vs Horay Solar HS640TC-MHD-D](https://comparepv.com/compare/horay-solar-hs645tc-mhd-d/horay-solar-hs640tc-mhd-d) - One difference: module efficiency - [Horay Solar HS645TC-MHD-D vs Horay Solar HS635TC-MHD-D](https://comparepv.com/compare/horay-solar-hs645tc-mhd-d/horay-solar-hs635tc-mhd-d) - 3 differences, the largest is module efficiency - [Horay Solar HS645TC-MHD-D vs Horay Solar HS630TC-MHD-D](https://comparepv.com/compare/horay-solar-hs645tc-mhd-d/horay-solar-hs630tc-mhd-d) - 3 differences, the largest is module efficiency - [Horay Solar HS720TC-MHG-D vs Horay Solar HS710TC-MHG-D](https://comparepv.com/compare/horay-solar-hs720tc-mhg-d/horay-solar-hs710tc-mhg-d) - 3 differences, the largest is module efficiency - [Horay Solar HS720TC-MHG-D vs Horay Solar HS700TC-MHG-D](https://comparepv.com/compare/horay-solar-hs720tc-mhg-d/horay-solar-hs700tc-mhg-d) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/horay-solar-hs645tc-mhd-d/horay-solar-hs720tc-mhg-d 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.