--- title: "Tata Power Solar TP637LG10B vs Tata Power Solar TP642LG10B - Solar Panel Comparison | ComparePV" description: "Compare Tata Power Solar TP637LG10B vs Tata Power Solar TP642LG10B side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp642lg10b" updated: 2026-09-11 --- # Tata Power Solar TP637LG10B vs Tata Power Solar TP642LG10B 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 | [Tata Power Solar TP637LG10B](https://comparepv.com/panel/tata-power-solar-tp637lg10b) | [Tata Power Solar TP642LG10B](https://comparepv.com/panel/tata-power-solar-tp642lg10b) | | Manufacturer | Tata Power Solar | Tata Power Solar | | Power | 637 Wp | 642 Wp | | Efficiency | 22.87 % | 23.05 % | | Technology | PERC | PERC | ## Every compared parameter | Parameter | TP637LG10B | TP642LG10B | | --- | --- | --- | | Rated power | 637 Wp | 642 Wp | | Module efficiency | 22.87 % | 23.05 % | | Power density | 228.7 Wp/m² | 230.5 Wp/m² | | Open-circuit voltage | 54.88 V | 55.00 V | | Voltage at max power | 47.16 V | 47.28 V | | Short-circuit current | 13.97 A | 14.01 A | | Current at max power | 13.50 A | 13.58 A | | Temperature coefficient | -0.370 %/°C | -0.370 %/°C | | Dimensions | 2456x1134x35 mm | 2456x1134x35 mm | | Module area | 2.785 m² | 2.785 m² | | Weight | 36.0 kg | 36.0 kg | | Weight per kWp | 56.5 kg/kWp | 56.1 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.60 %/yr | 0.60 %/yr | | Cell technology | PERC | PERC | | 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 (-0.370 %/°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, TP637LG10B:** 20,364 kWh - **Cumulative output, TP642LG10B:** 20,523 kWh - **Gap:** 159 kWh ## Output when hot | Condition | Cell temperature | TP637LG10B | TP642LG10B | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 637 W | 642 W | 100.0% of rated power | | Cool, bright day | 40 °C | 602 W | 606 W | 94.5% of rated power | | Typical summer roof | 55 °C | 566 W | 571 W | 88.9% of rated power | | Hot roof | 70 °C | 531 W | 535 W | 83.3% of rated power | ## Against the whole database | Measure | TP637LG10B | TP642LG10B | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,531 | #1,700 | 14,005 | TP642LG10B leads by 831 places | | Power density | #2,447 | #1,701 | 14,005 | TP642LG10B leads by 746 places | | Heat behaviour | #13,081 | #13,081 | 14,005 | Tied - the same position in the database | | Weight | #10,693 | #10,369 | 14,005 | TP642LG10B leads by 324 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,188 | #1,920 | 14,005 | TP642LG10B leads by 268 places | ## Questions ### Which panel is better: Tata Power Solar TP637LG10B or Tata Power Solar TP642LG10B? According to our database: **Tata Power Solar TP642LG10B** has higher module efficiency (**23.05%** vs **22.87%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tata Power Solar TP637LG10B and Tata Power Solar TP642LG10B? **Tata Power Solar TP637LG10B** has a module efficiency of **22.87%**, while **Tata Power Solar TP642LG10B** is **23.05%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tata Power Solar TP637LG10B use vs Tata Power Solar TP642LG10B? **Tata Power Solar TP637LG10B** uses **PERC** cells; **Tata Power Solar TP642LG10B** 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 Tata Power Solar TP637LG10B and Tata Power Solar TP642LG10B? **Tata Power Solar TP637LG10B** has a **30 years** power warranty; **Tata Power Solar TP642LG10B** 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 Tata Power Solar TP637LG10B and Tata Power Solar TP642LG10B bifacial panels? Both **Tata Power Solar TP637LG10B** and **Tata Power Solar TP642LG10B** 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 - [Tata Power Solar TP637LG10B vs Tata Power Solar TP631LG10B](https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp631lg10b) - One difference: module efficiency - [Tata Power Solar TP637LG10B vs Tata Power Solar TP626LG10B](https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp626lg10b) - 3 differences, the largest is module efficiency - [Tata Power Solar TP637LG10B vs Tata Power Solar TP621LG10B](https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp621lg10b) - 3 differences, the largest is module efficiency - [Tata Power Solar TP637LG10B vs Tata Power Solar TP615LG10B](https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp615lg10b) - 4 differences, the largest is module efficiency - [Tata Power Solar TP637LG10B vs Tata Power Solar TP610LG10B](https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp610lg10b) - 4 differences, the largest is module efficiency - [Tata Power Solar TP637LG10B vs Tata Power Solar TP600LG10B](https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp600lg10b) - 6 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tata-power-solar-tp637lg10b/tata-power-solar-tp642lg10b 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.