--- title: "EGing PV EG-670M66-HUV vs EGing PV EG-675NT66-HU/BF-DG - Solar Panel Comparison | ComparePV" description: "Compare EGing PV EG-670M66-HUV vs EGing PV EG-675NT66-HU/BF-DG side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-675nt66-hu-bf-dg" updated: 2026-09-11 --- # EGing PV EG-670M66-HUV vs EGing PV EG-675NT66-HU/BF-DG 675NT66-HU/BF-DG leads on the differences that matter The largest is temperature coefficient: 0.040 %/°C better in heat. 10 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [EGing PV EG-670M66-HUV](https://comparepv.com/panel/eging-pv-eg-670m66-huv) | [EGing PV EG-675NT66-HU/BF-DG](https://comparepv.com/panel/eging-pv-eg-675nt66-hu-bf-dg) | | Manufacturer | EGing PV | EGing PV | | Power | 670 Wp | 675 Wp | | Efficiency | 21.56 % | 21.72 % | | Technology | PERC | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 670M66-HUV | 675NT66-HU/BF-DG | Difference | | --- | --- | --- | --- | | Temperature coefficient | -0.340 %/°C | -0.300 %/°C | +0.040 %/°C for 675NT66-HU/BF-DG | | Performance warranty | 25 yrs | 30 yrs | +5 yrs for 675NT66-HU/BF-DG | | Annual degradation | 0.55 %/yr | 0.40 %/yr | -0.15 %/yr for 675NT66-HU/BF-DG | | Weight | 32.9 kg | 38.3 kg | -5.4 kg for 670M66-HUV | | Weight per kWp | 49.1 kg/kWp | 56.7 kg/kWp | -7.6 kg/kWp for 670M66-HUV | | Cell technology | PERC | TOPCon | PERC vs TOPCon | | Bifacial | No | Yes | No vs Yes | | Open-circuit voltage | 45.97 V | 47.22 V | 1.25 V apart | | Voltage at max power | 38.16 V | 39.43 V | 1.27 V apart | ## Every compared parameter | Parameter | 670M66-HUV | 675NT66-HU/BF-DG | | --- | --- | --- | | Rated power | 670 Wp | 675 Wp | | Module efficiency | 21.56 % | 21.72 % | | Power density | 215.7 Wp/m² | 217.3 Wp/m² | | Open-circuit voltage | 45.97 V | 47.22 V | | Voltage at max power | 38.16 V | 39.43 V | | Short-circuit current | 18.61 A | 18.14 A | | Current at max power | 17.56 A | 17.12 A | | Temperature coefficient | -0.340 %/°C | -0.300 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 32.9 kg | 38.3 kg | | Weight per kWp | 49.1 kg/kWp | 56.7 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 30 yrs | | Annual degradation | 0.55 %/yr | 0.40 %/yr | | Cell technology | PERC | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | No | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, 670M66-HUV:** 21,714 kWh - **Cumulative output, 675NT66-HU/BF-DG:** 22,648 kWh - **Gap:** 934 kWh ## Output when hot | Condition | Cell temperature | 670M66-HUV | 675NT66-HU/BF-DG | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 670 W | 675 W | 100.0% of rated power | | Cool, bright day | 40 °C | 636 W | 645 W | 94.9% of rated power | | Typical summer roof | 55 °C | 602 W | 614 W | 89.8% of rated power | | Hot roof | 70 °C | 567 W | 584 W | 84.7% of rated power | ## Against the whole database | Measure | 670M66-HUV | 675NT66-HU/BF-DG | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,774 | #7,399 | 14,005 | 675NT66-HU/BF-DG leads by 375 places | | Power density | #7,644 | #7,349 | 14,005 | 675NT66-HU/BF-DG leads by 295 places | | Heat behaviour | #8,778 | #6,093 | 14,005 | 675NT66-HU/BF-DG leads by 2,685 places | | Weight | #2,745 | #10,836 | 14,005 | 670M66-HUV leads by 8,091 places | | Warranty | #9,798 | #21 | 14,005 | 675NT66-HU/BF-DG leads by 9,777 places | | Overall | #3,378 | #2,173 | 14,005 | 675NT66-HU/BF-DG leads by 1,205 places | ## Questions ### Which panel is better: EGing PV EG-670M66-HUV or EGing PV EG-675NT66-HU/BF-DG? According to our database: **EGing PV EG-675NT66-HU/BF-DG** has higher module efficiency (**21.72%** vs **21.56%**); **EGing PV EG-675NT66-HU/BF-DG** tolerates heat better (temp coeff **-0.300%/°C** vs **-0.340%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of EGing PV EG-670M66-HUV and EGing PV EG-675NT66-HU/BF-DG? **EGing PV EG-670M66-HUV** has a module efficiency of **21.56%**, while **EGing PV EG-675NT66-HU/BF-DG** is **21.72%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does EGing PV EG-670M66-HUV use vs EGing PV EG-675NT66-HU/BF-DG? **EGing PV EG-670M66-HUV** uses **PERC** cells; **EGing PV EG-675NT66-HU/BF-DG** 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 EGing PV EG-670M66-HUV and EGing PV EG-675NT66-HU/BF-DG? **EGing PV EG-670M66-HUV** has a **25 years** power warranty; **EGing PV EG-675NT66-HU/BF-DG** 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 EGing PV EG-670M66-HUV and EGing PV EG-675NT66-HU/BF-DG bifacial panels? **EGing PV EG-675NT66-HU/BF-DG** is bifacial (captures light from both faces); **EGing PV EG-670M66-HUV** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [EGing PV EG-670M66-HUV vs EGing PV EG-685NT66-HU/BF-DG](https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-685nt66-hu-bf-dg) - 12 differences, the largest is temperature coefficient - [EGing PV EG-670M66-HUV vs EGing PV EG-680NT66-HU/BF-DG](https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-680nt66-hu-bf-dg) - 12 differences, the largest is temperature coefficient - [EGing PV EG-670M66-HUV vs EGing PV EG-670NT66-HU/BF-DG](https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-670nt66-hu-bf-dg) - 10 differences, the largest is temperature coefficient - [EGing PV EG-670M66-HUV vs EGing PV EG-670M66-HU/BF-DG](https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-670m66-hu-bf-dg) - 5 differences, the largest is performance warranty - [EGing PV EG-670M66-HUV vs EGing PV EG-665NT66-HU/BF-DG](https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-665nt66-hu-bf-dg) - 9 differences, the largest is temperature coefficient - [EGing PV EG-670M66-HUV vs EGing PV EG-665M66-HU/BF-DG](https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-665m66-hu-bf-dg) - 5 differences, the largest is performance warranty --- Source: https://comparepv.com/compare/eging-pv-eg-670m66-huv/eging-pv-eg-675nt66-hu-bf-dg 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.