--- title: "AIKO AIKO-A675-MAE78Dw vs Longi Solar LR8-66HVD-650M - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-A675-MAE78Dw vs Longi Solar LR8-66HVD-650M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/aiko-aiko-a675-mae78dw/longi-lr8-66hvd-650m" updated: 2026-09-11 --- # AIKO AIKO-A675-MAE78Dw vs Longi Solar LR8-66HVD-650M AIKO-A675-MAE78Dw leads on the differences that matter The largest is rated power: 25 W more power. 9 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [AIKO AIKO-A675-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a675-mae78dw) | [Longi Solar LR8-66HVD-650M](https://comparepv.com/panel/longi-lr8-66hvd-650m) | | Manufacturer | AIKO | Longi Solar | | Power | 675 Wp | 650 Wp | | Efficiency | 24.10 % | 24.06 % | | Technology | Back Contact | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | AIKO-A675-MAE78Dw | LR8-66HVD-650M | Difference | | --- | --- | --- | --- | | Rated power | 675 Wp | 650 Wp | +25 W for AIKO-A675-MAE78Dw | | Open-circuit voltage | 58.98 V | 49.72 V | 9.26 V apart | | Short-circuit current | 14.49 A | 16.54 A | 2.05 A apart | | Module area | 2.795 m² | 2.701 m² | 0.094 m² apart | | Voltage at max power | 48.85 V | 40.98 V | 7.87 V apart | | Current at max power | 13.82 A | 15.86 A | 2.04 A apart | | Cell count | 156 | 132 | 24 cells apart | | Weight | 34.5 kg | 33.5 kg | -1.0 kg for LR8-66HVD-650M | | Bifacial | No | Yes | No vs Yes | | Dimensions | 2465x1134x30 mm | 2382x1134x30 mm | 2465x1134x30 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | AIKO-A675-MAE78Dw | LR8-66HVD-650M | | --- | --- | --- | | Rated power | 675 Wp | 650 Wp | | Module efficiency | 24.10 % | 24.06 % | | Power density | 241.5 Wp/m² | 240.6 Wp/m² | | Open-circuit voltage | 58.98 V | 49.72 V | | Voltage at max power | 48.85 V | 40.98 V | | Short-circuit current | 14.49 A | 16.54 A | | Current at max power | 13.82 A | 15.86 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2465x1134x30 mm | 2382x1134x30 mm | | Module area | 2.795 m² | 2.701 m² | | Weight | 34.5 kg | 33.5 kg | | Weight per kWp | 51.1 kg/kWp | 51.5 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | Back Contact | Back Contact | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 132 | | Bifacial | No | 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, AIKO-A675-MAE78Dw:** 22,824 kWh - **Cumulative output, LR8-66HVD-650M:** 21,978 kWh - **Gap:** 846 kWh ## Output when hot | Condition | Cell temperature | AIKO-A675-MAE78Dw | LR8-66HVD-650M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 675 W | 650 W | 100.0% of rated power | | Cool, bright day | 40 °C | 649 W | 625 W | 96.1% of rated power | | Typical summer roof | 55 °C | 622 W | 599 W | 92.2% of rated power | | Hot roof | 70 °C | 596 W | 574 W | 88.3% of rated power | ## Against the whole database | Measure | AIKO-A675-MAE78Dw | LR8-66HVD-650M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #219 | #268 | 14,005 | AIKO-A675-MAE78Dw leads by 49 places | | Power density | #216 | #233 | 14,005 | AIKO-A675-MAE78Dw leads by 17 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #4,436 | #4,914 | 14,005 | AIKO-A675-MAE78Dw leads by 478 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #494 | #907 | 14,005 | AIKO-A675-MAE78Dw leads by 413 places | ## Questions ### Which panel is better: AIKO AIKO-A675-MAE78Dw or Longi Solar LR8-66HVD-650M? According to our database: **AIKO AIKO-A675-MAE78Dw** has higher module efficiency (**24.10%** vs **24.06%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-A675-MAE78Dw and Longi Solar LR8-66HVD-650M? **AIKO AIKO-A675-MAE78Dw** has a module efficiency of **24.10%**, while **Longi Solar LR8-66HVD-650M** is **24.06%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-A675-MAE78Dw use vs Longi Solar LR8-66HVD-650M? **AIKO AIKO-A675-MAE78Dw** uses **Back Contact** cells; **Longi Solar LR8-66HVD-650M** uses **Back Contact**. 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 AIKO AIKO-A675-MAE78Dw and Longi Solar LR8-66HVD-650M? **AIKO AIKO-A675-MAE78Dw** has a **30 years** power warranty; **Longi Solar LR8-66HVD-650M** 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 AIKO AIKO-A675-MAE78Dw and Longi Solar LR8-66HVD-650M bifacial panels? **Longi Solar LR8-66HVD-650M** is bifacial (captures light from both faces); **AIKO AIKO-A675-MAE78Dw** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [AIKO AIKO-A675-MAE78Dw vs AIKO AIKO-A700-MAE78Dw](https://comparepv.com/compare/aiko-aiko-a675-mae78dw/aiko-aiko-a700-mae78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A675-MAE78Dw vs AIKO AIKO-A695-MAE78Dw](https://comparepv.com/compare/aiko-aiko-a675-mae78dw/aiko-aiko-a695-mae78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A675-MAE78Dw vs AIKO AIKO-A690-MAE78Dw](https://comparepv.com/compare/aiko-aiko-a675-mae78dw/aiko-aiko-a690-mae78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A675-MAE78Dw vs AIKO AIKO-A685-MAE78Dw](https://comparepv.com/compare/aiko-aiko-a675-mae78dw/aiko-aiko-a685-mae78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A675-MAE78Dw vs AIKO AIKO-A680-MAE78Dw](https://comparepv.com/compare/aiko-aiko-a675-mae78dw/aiko-aiko-a680-mae78dw) - One difference: module efficiency - [Longi Solar LR8-66HVD-650M vs Longi Solar LR8-66HVD-665M](https://comparepv.com/compare/longi-lr8-66hvd-650m/longi-lr8-66hvd-665m) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/aiko-aiko-a675-mae78dw/longi-lr8-66hvd-650m 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.