--- title: "HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 615W - Solar Panel Comparison | ComparePV" description: "Compare HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 615W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-615w" image: "https://comparepv.com/og/compare/panels/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-615w.png" updated: 2026-09-11 --- # HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 615W 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 | [HT-SAAE HT66-18X(ND)-F-615](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-615) | [HT-SAAE HT66-18X(ND)-F 615W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-615w) | | Manufacturer | HT-SAAE | HT-SAAE | | Power | 615 Wp | 615 Wp | | Efficiency | 22.80 % | 22.80 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | F-615 | F 615W | | --- | --- | --- | | Rated power | 615 Wp | 615 Wp | | Module efficiency | 22.80 % | 22.80 % | | Power density | 227.7 Wp/m² | 227.7 Wp/m² | | Open-circuit voltage | 48.10 V | 48.10 V | | Voltage at max power | 40.00 V | 40.00 V | | Short-circuit current | 16.10 A | 16.10 A | | Current at max power | 15.38 A | 15.38 A | | Temperature coefficient | -0.310 %/°C | -0.310 %/°C | | Dimensions | 2382x1134x35 mm | 2382x1134x35 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 33.5 kg | 33.5 kg | | Weight per kWp | 54.5 kg/kWp | 54.5 kg/kWp | | Product warranty | 30 yrs | 30 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 Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.310 %/°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, F-615:** 20,634 kWh - **Cumulative output, F 615W:** 20,634 kWh - **Gap:** No difference ## Output when hot | Condition | Cell temperature | F-615 | F 615W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 615 W | 615 W | 100.0% of rated power | | Cool, bright day | 40 °C | 586 W | 586 W | 95.3% of rated power | | Typical summer roof | 55 °C | 558 W | 558 W | 90.7% of rated power | | Hot roof | 70 °C | 529 W | 529 W | 86.0% of rated power | ## Against the whole database | Measure | F-615 | F 615W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,769 | #2,769 | 14,129 | Tied - the same position in the database | | Power density | #3,132 | #3,132 | 14,129 | Tied - the same position in the database | | Heat behaviour | #8,069 | #8,069 | 14,129 | Tied - the same position in the database | | Weight | #8,895 | #8,895 | 14,129 | Tied - the same position in the database | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #720 | #720 | 14,129 | Tied - the same position in the database | ## Questions ### Which panel is better: HT-SAAE HT66-18X(ND)-F-615 or HT-SAAE HT66-18X(ND)-F 615W? According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of HT-SAAE HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F 615W? **HT-SAAE HT66-18X(ND)-F-615** has a module efficiency of **22.80%**, while **HT-SAAE HT66-18X(ND)-F **615 W**** is **22.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does HT-SAAE HT66-18X(ND)-F-615 use vs HT-SAAE HT66-18X(ND)-F 615W? **HT-SAAE HT66-18X(ND)-F-615** uses **TOPCon** cells; **HT-SAAE HT66-18X(ND)-F **615 W**** 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 HT-SAAE HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F 615W? **HT-SAAE HT66-18X(ND)-F-615** has a **30 years** power warranty; **HT-SAAE HT66-18X(ND)-F **615 W**** 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 HT-SAAE HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F 615W bifacial panels? Both **HT-SAAE HT66-18X(ND)-F-615** and **HT-SAAE HT66-18X(ND)-F **615 W**** 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 - [HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 620W](https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-620w) - One difference: module efficiency - [HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F-620](https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-620) - One difference: module efficiency - [HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 610W](https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-610w) - One difference: module efficiency - [HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F-610](https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-610) - One difference: module efficiency - [HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 605W](https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-605w) - 3 differences, the largest is module efficiency - [HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F-605](https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-605) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ht-saae-ht66-18x-nd-f-615/ht-saae-ht66-18x-nd-f-615w 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.