--- title: "Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12R-T132-GF-620 - Solar Panel Comparison | ComparePV" description: "Compare Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12R-T132-GF-620 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12r-t132-gf-620" updated: 2026-09-11 --- # Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12R-T132-GF-620 Identical on every published parameter All 19 comparable parameters agree. 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 | [Goldi Solar GS12R-T132-GF-615](https://comparepv.com/panel/goldi-solar-gs12r-t132-gf-615) | [Goldi Solar GS12R-T132-GF-620](https://comparepv.com/panel/goldi-solar-gs12r-t132-gf-620) | | Manufacturer | Goldi Solar | Goldi Solar | | Power | 615 Wp | 620 Wp | | Efficiency | 22.76 % | 22.95 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | 615 | 620 | | --- | --- | --- | | Rated power | 615 Wp | 620 Wp | | Module efficiency | 22.76 % | 22.95 % | | Power density | 227.7 Wp/m² | 229.5 Wp/m² | | Open-circuit voltage | 49.30 V | 49.60 V | | Voltage at max power | 40.90 V | 41.10 V | | Short-circuit current | 15.89 A | 15.92 A | | Current at max power | 15.04 A | 15.09 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 33.7 kg | 33.7 kg | | Weight per kWp | 54.8 kg/kWp | 54.4 kg/kWp | | Product warranty | 12 yrs | 12 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 (-0.300 %/°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, 615:** 20,634 kWh - **Cumulative output, 620:** 20,802 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 615 | 620 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 615 W | 620 W | 100.0% of rated power | | Cool, bright day | 40 °C | 587 W | 592 W | 95.5% of rated power | | Typical summer roof | 55 °C | 560 W | 564 W | 91.0% of rated power | | Hot roof | 70 °C | 532 W | 536 W | 86.5% of rated power | ## Against the whole database | Measure | 615 | 620 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,201 | #2,268 | 14,005 | 620 leads by 933 places | | Power density | #3,077 | #2,191 | 14,005 | 620 leads by 886 places | | Heat behaviour | #6,093 | #6,093 | 14,005 | Tied - the same position in the database | | Weight | #9,202 | #8,659 | 14,005 | 620 leads by 543 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,968 | #2,594 | 14,005 | 620 leads by 374 places | ## Questions ### Which panel is better: Goldi Solar GS12R-T132-GF-615 or Goldi Solar GS12R-T132-GF-620? According to our database: **Goldi Solar GS12R-T132-GF-620** has higher module efficiency (**22.95%** vs **22.76%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Goldi Solar GS12R-T132-GF-615 and Goldi Solar GS12R-T132-GF-620? **Goldi Solar GS12R-T132-GF-615** has a module efficiency of **22.76%**, while **Goldi Solar GS12R-T132-GF-620** is **22.95%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Goldi Solar GS12R-T132-GF-615 use vs Goldi Solar GS12R-T132-GF-620? **Goldi Solar GS12R-T132-GF-615** uses **TOPCon** cells; **Goldi Solar GS12R-T132-GF-620** 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 Goldi Solar GS12R-T132-GF-615 and Goldi Solar GS12R-T132-GF-620? **Goldi Solar GS12R-T132-GF-615** has a **30 years** power warranty; **Goldi Solar GS12R-T132-GF-620** 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 Goldi Solar GS12R-T132-GF-615 and Goldi Solar GS12R-T132-GF-620 bifacial panels? Both **Goldi Solar GS12R-T132-GF-615** and **Goldi Solar GS12R-T132-GF-620** 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 - [Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12-T132-GF-715](https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12-t132-gf-715) - 9 differences, the largest is rated power - [Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12-T132-GF-710](https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12-t132-gf-710) - 8 differences, the largest is rated power - [Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12-T132-GF-705](https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12-t132-gf-705) - 8 differences, the largest is rated power - [Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12-T132-GF-700](https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12-t132-gf-700) - 9 differences, the largest is rated power - [Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12-T132-GF-695](https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12-t132-gf-695) - 10 differences, the largest is rated power - [Goldi Solar GS12R-T132-GF-615 vs Goldi Solar GS12-T132-GF-690](https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12-t132-gf-690) - 10 differences, the largest is rated power --- Source: https://comparepv.com/compare/goldi-solar-gs12r-t132-gf-615/goldi-solar-gs12r-t132-gf-620 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.