--- title: "Longi Solar 615M vs Longi Solar LGi7-72HTD-610M - Solar Panel Comparison | ComparePV" description: "Compare Longi Solar 615M vs Longi Solar LGi7-72HTD-610M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/longi-615m/longi-solar-lgi7-72htd-610m" image: "https://comparepv.com/og/compare/panels/longi-615m/longi-solar-lgi7-72htd-610m.png" updated: 2026-09-11 --- # Longi Solar 615M vs Longi Solar LGi7-72HTD-610M Identical on every published parameter All 17 comparable parameters agree, with 2 more left out because at least one datasheet does not publish them. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Longi Solar 615M](https://comparepv.com/panel/longi-615m) | [Longi Solar LGi7-72HTD-610M](https://comparepv.com/panel/longi-solar-lgi7-72htd-610m) | | Manufacturer | Longi Solar | Longi Solar | | Power | 615 Wp | 610 Wp | | Efficiency | 22.90 % | 22.80 % | | Technology | | | ## Every compared parameter | Parameter | 615M | LGi7-72HTD-610M | | --- | --- | --- | | Rated power | 615 Wp | 610 Wp | | Module efficiency | 22.90 % | 22.80 % | | Power density | 229.5 Wp/m² | 227.6 Wp/m² | | Open-circuit voltage | 52.96 V | 52.81 V | | Voltage at max power | 44.63 V | 44.48 V | | Short-circuit current | 14.75 A | 14.69 A | | Current at max power | 13.78 A | 13.72 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2376x1128x5 mm | 2376x1128x5 mm | | Module area | 2.680 m² | 2.680 m² | | Weight | 31.0 kg | 31.0 kg | | Weight per kWp | 50.4 kg/kWp | 50.8 kg/kWp | | Product warranty | 25 yrs | 25 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | - | - | | Cell type | Monocrystalline | Monocrystalline | | Cell count | - | 72 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.280 %/°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, 615M:** 20,634 kWh - **Cumulative output, LGi7-72HTD-610M:** 20,467 kWh - **Gap:** 167 kWh ## Output when hot | Condition | Cell temperature | 615M | LGi7-72HTD-610M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 615 W | 610 W | 100.0% of rated power | | Cool, bright day | 40 °C | 589 W | 584 W | 95.8% of rated power | | Typical summer roof | 55 °C | 563 W | 559 W | 91.6% of rated power | | Hot roof | 70 °C | 538 W | 533 W | 87.4% of rated power | ## Against the whole database | Measure | 615M | LGi7-72HTD-610M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,412 | #2,769 | 14,129 | 615M leads by 357 places | | Power density | #2,367 | #3,244 | 14,129 | 615M leads by 877 places | | Heat behaviour | #1,347 | #1,347 | 14,129 | Tied - the same position in the database | | Weight | #3,802 | #4,244 | 14,129 | 615M leads by 442 places | | Warranty | #9,912 | #9,912 | 14,129 | Tied - the same position in the database | | Overall | #1,620 | #1,779 | 14,129 | 615M leads by 159 places | ## Questions ### Which panel is better: Longi Solar 615M or Longi Solar LGi7-72HTD-610M? According to our database: **Longi Solar 615M** has higher module efficiency (**22.90%** vs **22.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Longi Solar 615M and Longi Solar LGi7-72HTD-610M? **Longi Solar 615M** has a module efficiency of **22.90%**, while **Longi Solar LGi7-72HTD-610M** is **22.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Longi Solar 615M use vs Longi Solar LGi7-72HTD-610M? **Longi Solar 615M** uses Monocrystalline cells; **Longi Solar LGi7-72HTD-610M** uses Monocrystalline. 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 Longi Solar 615M and Longi Solar LGi7-72HTD-610M? **Longi Solar 615M** has a **25 years** power warranty; **Longi Solar LGi7-72HTD-610M** has a **25 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. ## Related comparisons - [Longi Solar 615M vs Longi Solar 620M](https://comparepv.com/compare/longi-615m/longi-620m) - One difference: module efficiency - [Longi Solar 615M vs Longi Solar LGi7-72HTD-620M](https://comparepv.com/compare/longi-615m/longi-solar-lgi7-72htd-620m) - One difference: module efficiency - [Longi Solar 615M vs Longi Solar LGi7-72HTD-615M](https://comparepv.com/compare/longi-615m/longi-solar-lgi7-72htd-615m) - The same specification on paper - [Longi Solar 615M vs Longi Solar 610M](https://comparepv.com/compare/longi-615m/longi-610m) - The same specification on paper - [Longi Solar 615M vs Longi Solar 605M](https://comparepv.com/compare/longi-615m/longi-605m) - 3 differences, the largest is module efficiency - [Longi Solar 615M vs Longi Solar LGi7-72HTD-605M](https://comparepv.com/compare/longi-615m/longi-solar-lgi7-72htd-605m) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/longi-615m/longi-solar-lgi7-72htd-610m 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.