--- title: "HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X-550W - Solar Panel Comparison | ComparePV" description: "Compare HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X-550W 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-ht72-18x-545w/ht-saae-ht72-18x-550w-1" updated: 2026-09-11 --- # HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X-550W 18X-550W leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [HT-SAAE HT72-18X 545W](https://comparepv.com/panel/ht-saae-ht72-18x-545w) | [HT-SAAE HT72-18X-550W](https://comparepv.com/panel/ht-saae-ht72-18x-550w-1) | | Manufacturer | HT-SAAE | HT-SAAE | | Power | 545 Wp | 550 Wp | | Efficiency | 21.10 % | 21.30 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 18X 545W | 18X-550W | Difference | | --- | --- | --- | --- | | Module efficiency | 21.10 % | 21.30 % | +0.20 pp for 18X-550W | ## Every compared parameter | Parameter | 18X 545W | 18X-550W | | --- | --- | --- | | Rated power | 545 Wp | 550 Wp | | Module efficiency | 21.10 % | 21.30 % | | Power density | 210.9 Wp/m² | 212.8 Wp/m² | | Open-circuit voltage | 49.65 V | 49.80 V | | Voltage at max power | 41.80 V | 41.95 V | | Short-circuit current | 13.95 A | 14.00 A | | Current at max power | 13.05 A | 13.12 A | | Temperature coefficient | -0.330 %/°C | -0.330 %/°C | | Dimensions | 2279x1134x35 mm | 2279x1134x35 mm | | Module area | 2.584 m² | 2.584 m² | | Weight | 28.5 kg | 28.5 kg | | Weight per kWp | 52.3 kg/kWp | 51.8 kg/kWp | | Product warranty | 25 yrs | 25 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | - | 0.60 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | Bifacial | No | No | ## 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 (-0.330 %/°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, 18X 545W:** 17,992 kWh - **Cumulative output, 18X-550W:** 18,157 kWh - **Gap:** 165 kWh ## Output when hot | Condition | Cell temperature | 18X 545W | 18X-550W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 545 W | 550 W | 100.0% of rated power | | Cool, bright day | 40 °C | 518 W | 523 W | 95.0% of rated power | | Typical summer roof | 55 °C | 491 W | 496 W | 90.1% of rated power | | Hot roof | 70 °C | 464 W | 468 W | 85.2% of rated power | ## Against the whole database | Measure | 18X 545W | 18X-550W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,297 | #8,519 | 14,005 | 18X-550W leads by 778 places | | Power density | #9,399 | #8,643 | 14,005 | 18X-550W leads by 756 places | | Heat behaviour | #8,545 | #8,545 | 14,005 | Tied - the same position in the database | | Weight | #5,761 | #5,204 | 14,005 | 18X-550W leads by 557 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #5,584 | #5,197 | 14,005 | 18X-550W leads by 387 places | ## Questions ### Which panel is better: HT-SAAE HT72-18X 545W or HT-SAAE HT72-18X-550W? According to our database: **HT-SAAE HT72-18X-**550 W**** has higher module efficiency (**21.30%** vs **21.10%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of HT-SAAE HT72-18X 545W and HT-SAAE HT72-18X-550W? **HT-SAAE HT72-18X **545 W**** has a module efficiency of **21.10%**, while **HT-SAAE HT72-18X-**550 W**** is **21.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does HT-SAAE HT72-18X 545W use vs HT-SAAE HT72-18X-550W? **HT-SAAE HT72-18X **545 W**** uses **PERC** cells; **HT-SAAE HT72-18X-**550 W**** uses **PERC**. 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 HT72-18X 545W and HT-SAAE HT72-18X-550W? **HT-SAAE HT72-18X **545 W**** has a **25 years** power warranty; **HT-SAAE HT72-18X-**550 W**** 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 - [HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X 560W](https://comparepv.com/compare/ht-saae-ht72-18x-545w/ht-saae-ht72-18x-560w) - 3 differences, the largest is module efficiency - [HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X 555W](https://comparepv.com/compare/ht-saae-ht72-18x-545w/ht-saae-ht72-18x-555w) - 3 differences, the largest is module efficiency - [HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X 550W](https://comparepv.com/compare/ht-saae-ht72-18x-545w/ht-saae-ht72-18x-550w) - One difference: module efficiency - [HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X 540W](https://comparepv.com/compare/ht-saae-ht72-18x-545w/ht-saae-ht72-18x-540w) - One difference: module efficiency - [HT-SAAE HT72-18X-550W vs HT-SAAE HT72-18X-560W](https://comparepv.com/compare/ht-saae-ht72-18x-550w-1/ht-saae-ht72-18x-560w-1) - 4 differences, the largest is module efficiency - [HT-SAAE HT72-18X-550W vs HT-SAAE HT72-18X-555W](https://comparepv.com/compare/ht-saae-ht72-18x-550w-1/ht-saae-ht72-18x-555w-1) - One difference: module efficiency --- Source: https://comparepv.com/compare/ht-saae-ht72-18x-545w/ht-saae-ht72-18x-550w-1 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.