---
title: "Hyundai HiS-T635NJ vs Hyundai HiT-H520LF-FB(ZB) - Solar Panel Comparison | ComparePV"
description: "Compare Hyundai HiS-T635NJ vs Hyundai HiT-H520LF-FB(ZB) side by side: what actually differs, output when it is hot, thirty-year production, and the full specification."
source: "https://comparepv.com/compare/hd-hyundai-energy-solutions-his-t635nj/hyundai-hit-h520lf-fb-zb"
updated: 2026-09-11
---

# Hyundai HiS-T635NJ vs Hyundai HiT-H520LF-FB(ZB)

HiT-H520LF-FB(ZB) leads on the differences that matter

The largest is temperature coefficient: 0.050 %/°C better in heat. 3 of 19 comparable parameters are identical.


## The two panels


| Attribute | A | B |
| --- | --- | --- |
| Panel | [Hyundai HiS-T635NJ](https://comparepv.com/panel/hd-hyundai-energy-solutions-his-t635nj) | [Hyundai HiT-H520LF-FB(ZB)](https://comparepv.com/panel/hyundai-hit-h520lf-fb-zb) |
| Manufacturer | Hyundai | Hyundai |
| Power | 635 Wp | 520 Wp |
| Efficiency | 22.72 % | 23.40 % |
| Technology | TOPCon | HJT |


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | HiS-T635NJ | HiT-H520LF-FB(ZB) | Difference |
| --- | --- | --- | --- |
| Temperature coefficient | -0.290 %/°C | -0.240 %/°C | +0.050 %/°C for HiT-H520LF-FB(ZB) |
| Module efficiency | 22.72 % | 23.40 % | +0.68 pp for HiT-H520LF-FB(ZB) |
| Rated power | 635 Wp | 520 Wp | +115 W for HiS-T635NJ |
| Weight | 34.7 kg | 27.1 kg | -7.6 kg for HiT-H520LF-FB(ZB) |
| Product warranty | 12 yrs | 30 yrs | +18 yrs for HiT-H520LF-FB(ZB) |
| Power density | 227.2 Wp/m² | 234.0 Wp/m² | +6.8 Wp/m² for HiT-H520LF-FB(ZB) |
| Annual degradation | 0.40 %/yr | 0.30 %/yr | -0.10 %/yr for HiT-H520LF-FB(ZB) |
| Open-circuit voltage | 57.56 V | 41.20 V | 16.36 V apart |
| Module area | 2.795 m² | 2.223 m² | 0.573 m² apart |
| Short-circuit current | 13.98 A | 15.92 A | 1.94 A apart |
| Cell technology | TOPCon | HJT | TOPCon vs HJT |
| Voltage at max power | 47.57 V | 34.60 V | 12.97 V apart |
| Cell count | 156 | 108 | 48 cells apart |
| Weight per kWp | 54.6 kg/kWp | 52.1 kg/kWp | -2.5 kg/kWp for HiT-H520LF-FB(ZB) |
| Current at max power | 13.35 A | 15.04 A | 1.69 A apart |
| Dimensions | 2465x1134x30 mm | 1960x1134x30 mm | 2465x1134x30 mm vs 1960x1134x30 mm |


## Every compared parameter


| Parameter | HiS-T635NJ | HiT-H520LF-FB(ZB) |
| --- | --- | --- |
| Rated power | 635 Wp | 520 Wp |
| Module efficiency | 22.72 % | 23.40 % |
| Power density | 227.2 Wp/m² | 234.0 Wp/m² |
| Open-circuit voltage | 57.56 V | 41.20 V |
| Voltage at max power | 47.57 V | 34.60 V |
| Short-circuit current | 13.98 A | 15.92 A |
| Current at max power | 13.35 A | 15.04 A |
| Temperature coefficient | -0.290 %/°C | -0.240 %/°C |
| Dimensions | 2465x1134x30 mm | 1960x1134x30 mm |
| Module area | 2.795 m² | 2.223 m² |
| Weight | 34.7 kg | 27.1 kg |
| Weight per kWp | 54.6 kg/kWp | 52.1 kg/kWp |
| Product warranty | 12 yrs | 30 yrs |
| Performance warranty | 30 yrs | 30 yrs |
| Annual degradation | 0.40 %/yr | 0.30 %/yr |
| Cell technology | TOPCon | HJT |
| Cell type | Monocrystalline | Monocrystalline |
| Cell count | 156 | 108 |
| Bifacial | Yes | Yes |


## Thirty-year yield

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

- **Cumulative output, HiS-T635NJ:** 21,306 kWh
- **Cumulative output, HiT-H520LF-FB(ZB):** 17,718 kWh
- **Gap:** 3,588 kWh


## Output when hot


| Condition | Cell temperature | HiS-T635NJ | HiT-H520LF-FB(ZB) | Retained |
| --- | --- | --- | --- | --- |
| Standard test conditions | 25 °C | 635 W | 520 W | 100.0% of rated power |
| Cool, bright day | 40 °C | 607 W | 501 W | 95.7% of rated power |
| Typical summer roof | 55 °C | 580 W | 483 W | 91.3% of rated power |
| Hot roof | 70 °C | 552 W | 464 W | 87.0% of rated power |


## Against the whole database


| Measure | HiS-T635NJ | HiT-H520LF-FB(ZB) | Out of | Note |
| --- | --- | --- | --- | --- |
| Efficiency | #3,245 | #882 | 14,005 | HiT-H520LF-FB(ZB) leads by 2,363 places |
| Power density | #3,252 | #898 | 14,005 | HiT-H520LF-FB(ZB) leads by 2,354 places |
| Heat behaviour | #2,165 | #13 | 14,005 | HiT-H520LF-FB(ZB) leads by 2,152 places |
| Weight | #9,020 | #5,593 | 14,005 | HiT-H520LF-FB(ZB) leads by 3,427 places |
| Warranty | #21 | #21 | 14,005 | Tied - the same position in the database |
| Overall | #2,358 | #1,953 | 14,005 | HiT-H520LF-FB(ZB) leads by 405 places |


## Questions


### Which panel is better: Hyundai HiS-T635NJ or Hyundai HiT-H520LF-FB(ZB)?

According to our database: **Hyundai HiT-H520LF-FB(ZB)** has higher module efficiency (**23.40%** vs **22.72%**); **Hyundai HiT-H520LF-FB(ZB)** tolerates heat better (temp coeff **-0.240%/°C** vs **-0.290%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture.


### What is the efficiency of Hyundai HiS-T635NJ and Hyundai HiT-H520LF-FB(ZB)?

**Hyundai HiS-T635NJ** has a module efficiency of **22.72%**, while **Hyundai HiT-H520LF-FB(ZB)** is **23.40%**. Higher efficiency means more electricity from the same roof area - useful when space is limited.


### What cell technology does Hyundai HiS-T635NJ use vs Hyundai HiT-H520LF-FB(ZB)?

**Hyundai HiS-T635NJ** uses **TOPCon** cells; **Hyundai HiT-H520LF-FB(ZB)** uses **HJT**. 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 Hyundai HiS-T635NJ and Hyundai HiT-H520LF-FB(ZB)?

**Hyundai HiS-T635NJ** has a **30 years** power warranty; **Hyundai HiT-H520LF-FB(ZB)** 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 Hyundai HiS-T635NJ and Hyundai HiT-H520LF-FB(ZB) bifacial panels?

Both **Hyundai HiS-T635NJ** and **Hyundai HiT-H520LF-FB(ZB)** 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

- [Hyundai HiS-T635NJ vs Hyundai HiS-T640NJ](https://comparepv.com/compare/hd-hyundai-energy-solutions-his-t635nj/hd-hyundai-energy-solutions-his-t640nj) - The same specification on paper
- [Hyundai HiS-T635NJ vs Hyundai HiS-T630NJ](https://comparepv.com/compare/hd-hyundai-energy-solutions-his-t635nj/hd-hyundai-energy-solutions-his-t630nj) - The same specification on paper
- [Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H515LF-FB(ZB)](https://comparepv.com/compare/hyundai-hit-h520lf-fb-zb/hyundai-hit-h515lf-fb-zb) - One difference: module efficiency
- [Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H510LF-FB(ZB)](https://comparepv.com/compare/hyundai-hit-h520lf-fb-zb/hyundai-hit-h510lf-fb-zb) - 3 differences, the largest is module efficiency
- [Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H505LF-FB(ZB)](https://comparepv.com/compare/hyundai-hit-h520lf-fb-zb/hyundai-hit-h505lf-fb-zb) - 3 differences, the largest is module efficiency
- [Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H500LF-FB(ZB)](https://comparepv.com/compare/hyundai-hit-h520lf-fb-zb/hyundai-hit-h500lf-fb-zb) - 4 differences, the largest is module efficiency


---

Source: https://comparepv.com/compare/hd-hyundai-energy-solutions-his-t635nj/hyundai-hit-h520lf-fb-zb

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.