--- title: "Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-730W-HD - Solar Panel Comparison | ComparePV" description: "Compare Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-730W-HD side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-730w-hd" updated: 2026-09-11 --- # Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-730W-HD 730W-HD leads on the differences that matter The largest is module efficiency: 0.32 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Just Solar JST-FCMH-720W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-720w-hd) | [Just Solar JST-FCMH-730W-HD](https://comparepv.com/panel/just-solar-jst-fcmh-730w-hd) | | Manufacturer | Just Solar | Just Solar | | Power | 720 Wp | 730 Wp | | Efficiency | 23.18 % | 23.50 % | | Technology | HJT | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 720W-HD | 730W-HD | Difference | | --- | --- | --- | --- | | Module efficiency | 23.18 % | 23.50 % | +0.32 pp for 730W-HD | | Power density | 231.8 Wp/m² | 235.0 Wp/m² | +3.2 Wp/m² for 730W-HD | | Rated power | 720 Wp | 730 Wp | +10 W for 730W-HD | ## Every compared parameter | Parameter | 720W-HD | 730W-HD | | --- | --- | --- | | Rated power | 720 Wp | 730 Wp | | Module efficiency | 23.18 % | 23.50 % | | Power density | 231.8 Wp/m² | 235.0 Wp/m² | | Open-circuit voltage | 51.11 V | 51.51 V | | Voltage at max power | 43.91 V | 44.35 V | | Short-circuit current | 17.29 A | 17.33 A | | Current at max power | 16.40 A | 16.46 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.3 kg | 38.3 kg | | Weight per kWp | 53.2 kg/kWp | 52.5 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.30 %/yr | 0.30 %/yr | | Cell technology | HJT | HJT | | 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 (-0.260 %/°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, 720W-HD:** 24,533 kWh - **Cumulative output, 730W-HD:** 24,874 kWh - **Gap:** 341 kWh ## Output when hot | Condition | Cell temperature | 720W-HD | 730W-HD | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 730 W | 100.0% of rated power | | Cool, bright day | 40 °C | 692 W | 702 W | 96.1% of rated power | | Typical summer roof | 55 °C | 664 W | 673 W | 92.2% of rated power | | Hot roof | 70 °C | 636 W | 645 W | 88.3% of rated power | ## Against the whole database | Measure | 720W-HD | 730W-HD | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,424 | #716 | 14,005 | 730W-HD leads by 708 places | | Power density | #1,347 | #800 | 14,005 | 730W-HD leads by 547 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #7,025 | #5,993 | 14,005 | 730W-HD leads by 1,032 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #354 | #199 | 14,005 | 730W-HD leads by 155 places | ## Questions ### Which panel is better: Just Solar JST-FCMH-720W-HD or Just Solar JST-FCMH-730W-HD? According to our database: **Just Solar JST-FCMH-**730 W**-HD** has higher module efficiency (**23.50%** vs **23.18%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Just Solar JST-FCMH-720W-HD and Just Solar JST-FCMH-730W-HD? **Just Solar JST-FCMH-**720 W**-HD** has a module efficiency of **23.18%**, while **Just Solar JST-FCMH-**730 W**-HD** is **23.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Just Solar JST-FCMH-720W-HD use vs Just Solar JST-FCMH-730W-HD? **Just Solar JST-FCMH-**720 W**-HD** uses **HJT** cells; **Just Solar JST-FCMH-**730 W**-HD** uses **HJT**. 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 Just Solar JST-FCMH-720W-HD and Just Solar JST-FCMH-730W-HD? **Just Solar JST-FCMH-**720 W**-HD** has a **30 years** power warranty; **Just Solar JST-FCMH-**730 W**-HD** 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 Just Solar JST-FCMH-720W-HD and Just Solar JST-FCMH-730W-HD bifacial panels? Both **Just Solar JST-FCMH-**720 W**-HD** and **Just Solar JST-FCMH-**730 W**-HD** 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 - [Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-740W-HD](https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-740w-hd) - 4 differences, the largest is module efficiency - [Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-735W-HD](https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-735w-hd) - 3 differences, the largest is module efficiency - [Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-725W-HD](https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-725w-hd) - The same specification on paper - [Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-715W-HD](https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-715w-hd) - The same specification on paper - [Just Solar JST-FCMH-720W-HD vs Just Solar JST-FCMH-710W-HD](https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-710w-hd) - 3 differences, the largest is module efficiency - [Just Solar JST-FCMH-720W-HD vs Just Solar JST-EBMH-560W-D](https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-ebmh-560w-d) - 14 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/just-solar-jst-fcmh-720w-hd/just-solar-jst-fcmh-730w-hd 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.