--- title: "Solaria SPV660-TG12-132BD vs Solaria SPV665-TG12-132BD - Solar Panel Comparison | ComparePV" description: "Compare Solaria SPV660-TG12-132BD vs Solaria SPV665-TG12-132BD side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-spv665-tg12-132bd" updated: 2026-09-11 --- # Solaria SPV660-TG12-132BD vs Solaria SPV665-TG12-132BD Identical on every published parameter All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. 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 | [Solaria SPV660-TG12-132BD](https://comparepv.com/panel/solaria-spv660-tg12-132bd) | [Solaria SPV665-TG12-132BD](https://comparepv.com/panel/solaria-spv665-tg12-132bd) | | Manufacturer | Solaria | Solaria | | Power | 660 Wp | 665 Wp | | Efficiency | 21.28 % | 21.44 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | SPV660-TG12-132BD | SPV665-TG12-132BD | | --- | --- | --- | | Rated power | 660 Wp | 665 Wp | | Module efficiency | 21.28 % | 21.44 % | | Power density | 212.7 Wp/m² | 214.3 Wp/m² | | Open-circuit voltage | 46.10 V | 46.30 V | | Voltage at max power | 38.81 V | 39.00 V | | Short-circuit current | 17.84 A | 17.87 A | | Current at max power | 17.01 A | 17.06 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 2383x1302x30 mm | 2383x1302x30 mm | | Module area | 3.103 m² | 3.103 m² | | Weight | 38.0 kg | 38.0 kg | | Weight per kWp | 57.6 kg/kWp | 57.1 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | - | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared first-year losses, with 0.40% a year afterwards assumed for both panels, 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, SPV660-TG12-132BD:** 21,907 kWh - **Cumulative output, SPV665-TG12-132BD:** 22,073 kWh - **Gap:** 166 kWh ## Output when hot | Condition | Cell temperature | SPV660-TG12-132BD | SPV665-TG12-132BD | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 660 W | 665 W | 100.0% of rated power | | Cool, bright day | 40 °C | 630 W | 635 W | 95.5% of rated power | | Typical summer roof | 55 °C | 601 W | 605 W | 91.0% of rated power | | Hot roof | 70 °C | 571 W | 575 W | 86.5% of rated power | ## Against the whole database | Measure | SPV660-TG12-132BD | SPV665-TG12-132BD | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #8,795 | #8,267 | 14,005 | SPV665-TG12-132BD leads by 528 places | | Power density | #8,718 | #8,232 | 14,005 | SPV665-TG12-132BD leads by 486 places | | Heat behaviour | #6,093 | #6,093 | 14,005 | Tied - the same position in the database | | Weight | #11,284 | #11,052 | 14,005 | SPV665-TG12-132BD leads by 232 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,149 | #2,776 | 14,005 | SPV665-TG12-132BD leads by 373 places | ## Questions ### Which panel is better: Solaria SPV660-TG12-132BD or Solaria SPV665-TG12-132BD? According to our database: **Solaria SPV665-TG12-132BD** has higher module efficiency (**21.44%** vs **21.28%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Solaria SPV660-TG12-132BD and Solaria SPV665-TG12-132BD? **Solaria SPV660-TG12-132BD** has a module efficiency of **21.28%**, while **Solaria SPV665-TG12-132BD** is **21.44%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Solaria SPV660-TG12-132BD use vs Solaria SPV665-TG12-132BD? **Solaria SPV660-TG12-132BD** uses **TOPCon** cells; **Solaria SPV665-TG12-132BD** 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 Solaria SPV660-TG12-132BD and Solaria SPV665-TG12-132BD? **Solaria SPV660-TG12-132BD** has a **30 years** power warranty; **Solaria SPV665-TG12-132BD** 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 Solaria SPV660-TG12-132BD and Solaria SPV665-TG12-132BD bifacial panels? Both **Solaria SPV660-TG12-132BD** and **Solaria SPV665-TG12-132BD** 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 - [Solaria SPV660-TG12-132BD vs Solaria SPV680-TG12-132BD](https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-spv680-tg12-132bd) - 3 differences, the largest is module efficiency - [Solaria SPV660-TG12-132BD vs Solaria SPV675-TG12-132BD](https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-spv675-tg12-132bd) - 3 differences, the largest is module efficiency - [Solaria SPV660-TG12-132BD vs Solaria SPV670-TG12-132BD](https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-spv670-tg12-132bd) - 3 differences, the largest is module efficiency - [Solaria SPV660-TG12-132BD vs Solaria PowerXT 430R-PL](https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-powerxt-430r-pl) - 12 differences, the largest is module efficiency - [Solaria SPV660-TG12-132BD vs Solaria Solaria PowerXT-430C-PD](https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-solaria-powerxt-430c-pd) - 14 differences, the largest is module efficiency - [Solaria SPV660-TG12-132BD vs Solaria PowerXT 420R-PL](https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-powerxt-420r-pl) - 12 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/solaria-spv660-tg12-132bd/solaria-spv665-tg12-132bd 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.