--- title: "LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M690N66UB-SF-F7 - Solar Panel Comparison | ComparePV" description: "Compare LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M690N66UB-SF-F7 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m690n66ub-sf-f7" updated: 2026-09-11 --- # LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M690N66UB-SF-F7 M685~705N66UB-SF-F7-700 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 | [LEDVANCE M685~705N66UB-SF-F7-700](https://comparepv.com/panel/ledvance-m685-705n66ub-sf-f7-700) | [LEDVANCE M690N66UB-SF-F7](https://comparepv.com/panel/ledvance-m690n66ub-sf-f7) | | Manufacturer | LEDVANCE | LEDVANCE | | Power | 700 Wp | 690 Wp | | Efficiency | 22.53 % | 22.21 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | M685~705N66UB-SF-F7-700 | M690N66UB-SF-F7 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.53 % | 22.21 % | +0.32 pp for M685~705N66UB-SF-F7-700 | | Power density | 225.3 Wp/m² | 222.1 Wp/m² | +3.2 Wp/m² for M685~705N66UB-SF-F7-700 | | Rated power | 700 Wp | 690 Wp | +10 W for M685~705N66UB-SF-F7-700 | ## Every compared parameter | Parameter | M685~705N66UB-SF-F7-700 | M690N66UB-SF-F7 | | --- | --- | --- | | Rated power | 700 Wp | 690 Wp | | Module efficiency | 22.53 % | 22.21 % | | Power density | 225.3 Wp/m² | 222.1 Wp/m² | | Open-circuit voltage | 48.00 V | 47.80 V | | Voltage at max power | 40.50 V | 40.10 V | | Short-circuit current | 18.32 A | 18.24 A | | Current at max power | 17.29 A | 17.21 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 34.5 kg | 34.5 kg | | Weight per kWp | 49.3 kg/kWp | 50.0 kg/kWp | | Product warranty | 25 yrs | 25 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 Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.300 %/°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, M685~705N66UB-SF-F7-700:** 23,486 kWh - **Cumulative output, M690N66UB-SF-F7:** 23,151 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | M685~705N66UB-SF-F7-700 | M690N66UB-SF-F7 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 700 W | 690 W | 100.0% of rated power | | Cool, bright day | 40 °C | 669 W | 659 W | 95.5% of rated power | | Typical summer roof | 55 °C | 637 W | 628 W | 91.0% of rated power | | Hot roof | 70 °C | 606 W | 597 W | 86.5% of rated power | ## Against the whole database | Measure | M685~705N66UB-SF-F7-700 | M690N66UB-SF-F7 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,982 | #5,754 | 14,005 | M685~705N66UB-SF-F7-700 leads by 1,772 places | | Power density | #3,989 | #5,734 | 14,005 | M685~705N66UB-SF-F7-700 leads by 1,745 places | | Heat behaviour | #6,093 | #6,093 | 14,005 | Tied - the same position in the database | | Weight | #2,850 | #3,575 | 14,005 | M685~705N66UB-SF-F7-700 leads by 725 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #213 | #370 | 14,005 | M685~705N66UB-SF-F7-700 leads by 157 places | ## Questions ### Which panel is better: LEDVANCE M685~705N66UB-SF-F7-700 or LEDVANCE M690N66UB-SF-F7? According to our database: **LEDVANCE M685~705N66UB-SF-F7-700** has higher module efficiency (**22.53%** vs **22.21%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of LEDVANCE M685~705N66UB-SF-F7-700 and LEDVANCE M690N66UB-SF-F7? **LEDVANCE M685~705N66UB-SF-F7-700** has a module efficiency of **22.53%**, while **LEDVANCE M690N66UB-SF-F7** is **22.21%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does LEDVANCE M685~705N66UB-SF-F7-700 use vs LEDVANCE M690N66UB-SF-F7? **LEDVANCE M685~705N66UB-SF-F7-700** uses **TOPCon** cells; **LEDVANCE M690N66UB-SF-F7** 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 LEDVANCE M685~705N66UB-SF-F7-700 and LEDVANCE M690N66UB-SF-F7? **LEDVANCE M685~705N66UB-SF-F7-700** has a **30 years** power warranty; **LEDVANCE M690N66UB-SF-F7** 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 LEDVANCE M685~705N66UB-SF-F7-700 and LEDVANCE M690N66UB-SF-F7 bifacial panels? Both **LEDVANCE M685~705N66UB-SF-F7-700** and **LEDVANCE M690N66UB-SF-F7** 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 - [LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M685~705N66UB-SF-F7-705](https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m685-705n66ub-sf-f7-705) - The same specification on paper - [LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M705N66UB-SF-F7](https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m705n66ub-sf-f7) - The same specification on paper - [LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M700N66UB-SF-F7](https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m700n66ub-sf-f7) - The same specification on paper - [LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M685~705N66UB-SF-F7-695](https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m685-705n66ub-sf-f7-695) - The same specification on paper - [LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M695N66UB-SF-F7](https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m695n66ub-sf-f7) - The same specification on paper - [LEDVANCE M685~705N66UB-SF-F7-700 vs LEDVANCE M685~705N66UB-SF-F7-690](https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m685-705n66ub-sf-f7-690) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ledvance-m685-705n66ub-sf-f7-700/ledvance-m690n66ub-sf-f7 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.