--- title: "Seraphim SRP-690-BTC-BG vs Seraphim SRP-720-BTC-BG - Solar Panel Comparison | ComparePV" description: "Compare Seraphim SRP-690-BTC-BG vs Seraphim SRP-720-BTC-BG side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/seraphim-srp-690-btc-bg/seraphim-srp-720-btc-bg" updated: 2026-09-11 --- # Seraphim SRP-690-BTC-BG vs Seraphim SRP-720-BTC-BG 720-BTC-BG leads on the differences that matter The largest is module efficiency: 0.97 pp more efficient. 13 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Seraphim SRP-690-BTC-BG](https://comparepv.com/panel/seraphim-srp-690-btc-bg) | [Seraphim SRP-720-BTC-BG](https://comparepv.com/panel/seraphim-srp-720-btc-bg) | | Manufacturer | Seraphim | Seraphim | | Power | 690 Wp | 720 Wp | | Efficiency | 22.21 % | 23.18 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 690-BTC-BG | 720-BTC-BG | Difference | | --- | --- | --- | --- | | Module efficiency | 22.21 % | 23.18 % | +0.97 pp for 720-BTC-BG | | Power density | 222.1 Wp/m² | 231.8 Wp/m² | +9.7 Wp/m² for 720-BTC-BG | | Rated power | 690 Wp | 720 Wp | +30 W for 720-BTC-BG | | Weight per kWp | 55.8 kg/kWp | 53.5 kg/kWp | -2.3 kg/kWp for 720-BTC-BG | | Open-circuit voltage | 48.10 V | 49.30 V | 1.20 V apart | | Voltage at max power | 40.13 V | 41.33 V | 1.20 V apart | ## Every compared parameter | Parameter | 690-BTC-BG | 720-BTC-BG | | --- | --- | --- | | Rated power | 690 Wp | 720 Wp | | Module efficiency | 22.21 % | 23.18 % | | Power density | 222.1 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 48.10 V | 49.30 V | | Voltage at max power | 40.13 V | 41.33 V | | Short-circuit current | 18.24 A | 18.48 A | | Current at max power | 17.20 A | 17.43 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.5 kg | 38.5 kg | | Weight per kWp | 55.8 kg/kWp | 53.5 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | 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 (-0.290 %/°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, 690-BTC-BG:** 23,151 kWh - **Cumulative output, 720-BTC-BG:** 24,157 kWh - **Gap:** 1,006 kWh ## Output when hot | Condition | Cell temperature | 690-BTC-BG | 720-BTC-BG | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 690 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 660 W | 689 W | 95.7% of rated power | | Typical summer roof | 55 °C | 630 W | 657 W | 91.3% of rated power | | Hot roof | 70 °C | 600 W | 626 W | 87.0% of rated power | ## Against the whole database | Measure | 690-BTC-BG | 720-BTC-BG | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,754 | #1,424 | 14,005 | 720-BTC-BG leads by 4,330 places | | Power density | #5,734 | #1,347 | 14,005 | 720-BTC-BG leads by 4,387 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #10,180 | #7,424 | 14,005 | 720-BTC-BG leads by 2,756 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,286 | #362 | 14,005 | 720-BTC-BG leads by 924 places | ## Questions ### Which panel is better: Seraphim SRP-690-BTC-BG or Seraphim SRP-720-BTC-BG? According to our database: **Seraphim SRP-720-BTC-BG** has higher module efficiency (**23.18%** vs **22.21%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Seraphim SRP-690-BTC-BG and Seraphim SRP-720-BTC-BG? **Seraphim SRP-690-BTC-BG** has a module efficiency of **22.21%**, while **Seraphim SRP-720-BTC-BG** is **23.18%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Seraphim SRP-690-BTC-BG use vs Seraphim SRP-720-BTC-BG? **Seraphim SRP-690-BTC-BG** uses **TOPCon** cells; **Seraphim SRP-720-BTC-BG** 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 Seraphim SRP-690-BTC-BG and Seraphim SRP-720-BTC-BG? **Seraphim SRP-690-BTC-BG** has a **30 years** power warranty; **Seraphim SRP-720-BTC-BG** 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 Seraphim SRP-690-BTC-BG and Seraphim SRP-720-BTC-BG bifacial panels? Both **Seraphim SRP-690-BTC-BG** and **Seraphim SRP-720-BTC-BG** 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 - [Seraphim SRP-690-BTC-BG vs Seraphim SRP-685-BTC-BG](https://comparepv.com/compare/seraphim-srp-690-btc-bg/seraphim-srp-685-btc-bg) - The same specification on paper - [Seraphim SRP-720-BTC-BG vs Seraphim SRP-715-BTC-BG](https://comparepv.com/compare/seraphim-srp-720-btc-bg/seraphim-srp-715-btc-bg) - The same specification on paper - [Seraphim SRP-720-BTC-BG vs Seraphim SRP-710-BTC-BG](https://comparepv.com/compare/seraphim-srp-720-btc-bg/seraphim-srp-710-btc-bg) - 3 differences, the largest is module efficiency - [Seraphim SRP-720-BTC-BG vs Seraphim SRP-705-BTC-BG](https://comparepv.com/compare/seraphim-srp-720-btc-bg/seraphim-srp-705-btc-bg) - 3 differences, the largest is module efficiency - [Seraphim SRP-720-BTC-BG vs Seraphim SRP-700-BTC-BG](https://comparepv.com/compare/seraphim-srp-720-btc-bg/seraphim-srp-700-btc-bg) - 3 differences, the largest is module efficiency - [Seraphim SRP-720-BTC-BG vs Seraphim SRP-695-BTC-BG](https://comparepv.com/compare/seraphim-srp-720-btc-bg/seraphim-srp-695-btc-bg) - 5 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/seraphim-srp-690-btc-bg/seraphim-srp-720-btc-bg 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.