--- title: "HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(N)-625W - Solar Panel Comparison | ComparePV" description: "Compare HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(N)-625W 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-n-615w/ht-saae-ht66-18x-n-625w" image: "https://comparepv.com/og/compare/panels/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-n-625w.png" updated: 2026-09-11 --- # HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(N)-625W 625W leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [HT-SAAE HT66-18X(N)-615W](https://comparepv.com/panel/ht-saae-ht66-18x-n-615w) | [HT-SAAE HT66-18X(N)-625W](https://comparepv.com/panel/ht-saae-ht66-18x-n-625w) | | Manufacturer | HT-SAAE | HT-SAAE | | Power | 615 Wp | 625 Wp | | Efficiency | 22.80 % | 23.10 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 615W | 625W | Difference | | --- | --- | --- | --- | | Module efficiency | 22.80 % | 23.10 % | +0.30 pp for 625W | | Power density | 227.7 Wp/m² | 231.4 Wp/m² | +3.7 Wp/m² for 625W | | Rated power | 615 Wp | 625 Wp | +10 W for 625W | ## Every compared parameter | Parameter | 615W | 625W | | --- | --- | --- | | Rated power | 615 Wp | 625 Wp | | Module efficiency | 22.80 % | 23.10 % | | Power density | 227.7 Wp/m² | 231.4 Wp/m² | | Open-circuit voltage | 48.10 V | 48.50 V | | Voltage at max power | 40.00 V | 40.40 V | | Short-circuit current | 16.10 A | 16.20 A | | Current at max power | 15.38 A | 15.48 A | | Temperature coefficient | -0.310 %/°C | -0.310 %/°C | | Dimensions | 2382x1134x35 mm | 2382x1134x35 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 29.0 kg | 29.0 kg | | Weight per kWp | 47.2 kg/kWp | 46.4 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 | 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 (-0.310 %/°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, 615W:** 20,634 kWh - **Cumulative output, 625W:** 20,970 kWh - **Gap:** 336 kWh ## Output when hot | Condition | Cell temperature | 615W | 625W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 615 W | 625 W | 100.0% of rated power | | Cool, bright day | 40 °C | 586 W | 596 W | 95.3% of rated power | | Typical summer roof | 55 °C | 558 W | 567 W | 90.7% of rated power | | Hot roof | 70 °C | 529 W | 538 W | 86.0% of rated power | ## Against the whole database | Measure | 615W | 625W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,769 | #1,617 | 14,129 | 625W leads by 1,152 places | | Power density | #3,132 | #1,558 | 14,129 | 625W leads by 1,574 places | | Heat behaviour | #8,069 | #8,069 | 14,129 | Tied - the same position in the database | | Weight | #1,520 | #1,141 | 14,129 | 625W leads by 379 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #660 | #399 | 14,129 | 625W leads by 261 places | ## Questions ### Which panel is better: HT-SAAE HT66-18X(N)-615W or HT-SAAE HT66-18X(N)-625W? According to our database: **HT-SAAE HT66-18X(N)-**625 W**** has higher module efficiency (**23.10%** vs **22.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of HT-SAAE HT66-18X(N)-615W and HT-SAAE HT66-18X(N)-625W? **HT-SAAE HT66-18X(N)-**615 W**** has a module efficiency of **22.80%**, while **HT-SAAE HT66-18X(N)-**625 W**** is **23.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does HT-SAAE HT66-18X(N)-615W use vs HT-SAAE HT66-18X(N)-625W? **HT-SAAE HT66-18X(N)-**615 W**** uses **TOPCon** cells; **HT-SAAE HT66-18X(N)-**625 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(N)-615W and HT-SAAE HT66-18X(N)-625W? **HT-SAAE HT66-18X(N)-**615 W**** has a **30 years** power warranty; **HT-SAAE HT66-18X(N)-**625 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. ## Related comparisons - [HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(N)-630W](https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-n-630w) - 3 differences, the largest is module efficiency - [HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(ND)-F 620W](https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-nd-f-620w) - 4 differences, the largest is weight - [HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(N)-620W](https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-n-620w) - One difference: module efficiency - [HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(ND)-F-620](https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-nd-f-620) - 4 differences, the largest is weight - [HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(ND)-F 615W](https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-nd-f-615w) - 3 differences, the largest is weight - [HT-SAAE HT66-18X(N)-615W vs HT-SAAE HT66-18X(ND)-F-615](https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-nd-f-615) - 3 differences, the largest is weight --- Source: https://comparepv.com/compare/ht-saae-ht66-18x-n-615w/ht-saae-ht66-18x-n-625w 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.