--- title: "Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB156(HCBF)-640W - Solar Panel Comparison | ComparePV" description: "Compare Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB156(HCBF)-640W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb156-hcbf-640w" image: "https://comparepv.com/og/compare/panels/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb156-hcbf-640w.png" updated: 2026-09-12 --- # Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB156(HCBF)-640W 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 | [Philadelphia Solar PS-MNB156(HCBF)-635W](https://comparepv.com/panel/philadelphia-solar-ps-mnb156-hcbf-635w) | [Philadelphia Solar PS-MNB156(HCBF)-640W](https://comparepv.com/panel/philadelphia-solar-ps-mnb156-hcbf-640w) | | Manufacturer | Philadelphia Solar | Philadelphia Solar | | Power | 635 Wp | 640 Wp | | Efficiency | 22.75 % | 22.90 % | | Technology | N-type | N-type | ## Every compared parameter | Parameter | 635W | 640W | | --- | --- | --- | | Rated power | 635 Wp | 640 Wp | | Module efficiency | 22.75 % | 22.90 % | | Power density | 227.3 Wp/m² | 229.0 Wp/m² | | Open-circuit voltage | 56.10 V | 56.25 V | | Voltage at max power | 47.52 V | 47.78 V | | Short-circuit current | 14.14 A | 14.18 A | | Current at max power | 13.37 A | 13.41 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2464x1134x35 mm | 2464x1134x35 mm | | Module area | 2.794 m² | 2.794 m² | | Weight | 32.5 kg | 32.5 kg | | Weight per kWp | 51.2 kg/kWp | 50.8 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 156 | | 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 (-0.290 %/°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, 635W:** 21,306 kWh - **Cumulative output, 640W:** 21,473 kWh - **Gap:** 167 kWh ## Output when hot | Condition | Cell temperature | 635W | 640W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 635 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 607 W | 612 W | 95.7% of rated power | | Typical summer roof | 55 °C | 580 W | 584 W | 91.3% of rated power | | Hot roof | 70 °C | 552 W | 556 W | 87.0% of rated power | ## Against the whole database | Measure | 635W | 640W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,207 | #2,359 | 14,005 | 640W leads by 848 places | | Power density | #3,230 | #2,380 | 14,005 | 640W leads by 850 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #4,557 | #4,196 | 14,005 | 640W leads by 361 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,296 | #2,048 | 14,005 | 640W leads by 248 places | ## Questions ### Which panel is better: Philadelphia Solar PS-MNB156(HCBF)-635W or Philadelphia Solar PS-MNB156(HCBF)-640W? According to our database: **Philadelphia Solar PS-MNB156(HCBF)-**640 W**** has higher module efficiency (**22.90%** vs **22.75%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Philadelphia Solar PS-MNB156(HCBF)-635W and Philadelphia Solar PS-MNB156(HCBF)-640W? **Philadelphia Solar PS-MNB156(HCBF)-**635 W**** has a module efficiency of **22.75%**, while **Philadelphia Solar PS-MNB156(HCBF)-**640 W**** is **22.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Philadelphia Solar PS-MNB156(HCBF)-635W use vs Philadelphia Solar PS-MNB156(HCBF)-640W? **Philadelphia Solar PS-MNB156(HCBF)-**635 W**** uses **N-type** cells; **Philadelphia Solar PS-MNB156(HCBF)-**640 W**** uses **N-type**. 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 Philadelphia Solar PS-MNB156(HCBF)-635W and Philadelphia Solar PS-MNB156(HCBF)-640W? **Philadelphia Solar PS-MNB156(HCBF)-**635 W**** has a **30 years** power warranty; **Philadelphia Solar PS-MNB156(HCBF)-**640 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 Philadelphia Solar PS-MNB156(HCBF)-635W and Philadelphia Solar PS-MNB156(HCBF)-640W bifacial panels? Both **Philadelphia Solar PS-MNB156(HCBF)-**635 W**** and **Philadelphia Solar PS-MNB156(HCBF)-**640 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 - [Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB156(HCBF)-650W](https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb156-hcbf-650w) - 3 differences, the largest is module efficiency - [Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB156(HCBF)-645W](https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb156-hcbf-645w) - 3 differences, the largest is module efficiency - [Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB156(HCBF)-630W](https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb156-hcbf-630w) - The same specification on paper - [Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB144(HCBF)-600W](https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb144-hcbf-600w) - 10 differences, the largest is rated power - [Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNG144(HCBF)-600W](https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mng144-hcbf-600w) - 9 differences, the largest is rated power - [Philadelphia Solar PS-MNB156(HCBF)-635W vs Philadelphia Solar PS-MNB144(HCBF)-595W](https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb144-hcbf-595w) - 10 differences, the largest is rated power --- Source: https://comparepv.com/compare/philadelphia-solar-ps-mnb156-hcbf-635w/philadelphia-solar-ps-mnb156-hcbf-640w 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.