🌞 How Is Solar Panel Efficiency Calculated?

What Does a 25% Conversion Rate Really Mean?

— Unveiling the Core Strength of GTPOW’s High-Efficiency TOPCon Solar Technology

In an era where sustainability defines the future, solar power has become one of the most promising clean energy sources on the planet.
As technology continues to evolve, conversion efficiency has become the key benchmark for evaluating solar panel performance.

But what exactly does a “25% conversion rate” mean?
It’s more than just a number — it represents GTPOW’s commitment to advanced solar innovation and real-world performance.

1️⃣ What Is Solar Conversion Efficiency?

Solar conversion efficiency refers to the ratio of solar energy that can be converted into usable electricity by a solar cell.
Under Standard Test Conditions (STC), when the sunlight intensity is 1000W/m², if a 1㎡ solar panel outputs 250W of power,
its efficiency is 25%.

In other words, 25% of the incoming solar energy is successfully transformed into electricity.
While it may sound modest, in the field of photovoltaics, every single percentage increase represents a major technological leap.

2️⃣ Why Is Efficiency So Important?

Higher efficiency means more power generation from the same panel area —
a critical advantage for portable solar products where size and weight are limited.

For example:
A GTPOW 100W solar panel with 25% efficiency can generate around 13.6% more power than a conventional 22% panel of the same size.

In practical use, this translates into faster charging, shorter refueling time, and higher energy utilization —
all essential for outdoor users who rely on consistent power supply.

3️⃣ The Core of GTPOW Technology: TOPCon High-Efficiency Solar Cells

GTPOW’s portable solar panels — including the 40W and 100W series —
adopt TOPCon high-efficiency monocrystalline solar cells (Tunnel Oxide Passivated Contact),
one of the most advanced photovoltaic structures in today’s industry.

🔬 How TOPCon Technology Works

Built on a P-type or N-type silicon wafer,
TOPCon adds an ultra-thin tunnel oxide layer and a polysilicon passivated contact layer on the rear side of the cell.
This reduces electron recombination and enhances carrier transport, allowing more sunlight to be converted into electricity.

This innovative structure ensures that even under variable sunlight,
TOPCon cells maintain high output and excellent stability — delivering reliable power wherever sunlight reaches.

4️⃣ Advantages of GTPOW’s TOPCon Solar Technology

GTPOW refines the standard TOPCon structure with multiple proprietary optimizations,
ensuring superior real-world performance beyond laboratory data.

1️⃣ Ultra-High Conversion Efficiency – Up to 25%

The TOPCon cells used in GTPOW’s solar panels achieve a real-world conversion rate of 25%,
delivering stronger power generation and faster charging performance.
For outdoor professionals — campers, photographers, RV travelers — every ray of sunlight is converted into more usable energy.

2️⃣ Excellent High-Temperature Performance

TOPCon technology has a low temperature coefficient (≈ -0.30%/°C),
which means it maintains stable output even under intense heat.
Compared to ordinary cells, it reduces power loss by 10–15%,
making it ideal for vehicle roofs, desert environments, and hot outdoor conditions.

3️⃣ Low Degradation and Long Lifespan

The passivated contact layer effectively minimizes Light-Induced Degradation (LID),
ensuring high performance stability over years of use.
GTPOW’s TOPCon panels retain over 95% of their initial capacity even after 5 years of outdoor operation.

4️⃣ Stable Bifacial Power Generation

Both the 40W and 100W GTPOW solar panels feature a bifacial design,
capturing not only direct sunlight from the front but also reflected light from the back.
Under similar conditions, this design provides up to 4 extra hours of charging efficiency,
ensuring maximum utilization of ambient light — truly, “two sides, double the power.”

5️⃣ Lightweight Design Meets High Efficiency

Beyond cell technology, GTPOW focuses on structural optimization:

• 100W dual-sided folding panel — only 3.4kg, ultra-portable;

• 40W portable panel — compact and equipped with a durable protective bag;

• IP67 waterproof & dustproof — ready for rain, dust, or snow;

• UV-resistant encapsulation — long-lasting under harsh sunlight.

GTPOW’s design philosophy blends efficiency with portability,
allowing solar technology to truly empower outdoor living.

6️⃣ What Does 25% Efficiency Mean for You?

A 25% conversion rate isn’t just a higher number —
it’s a better user experience and a smarter energy solution.

In real-world use, a GTPOW 100W solar panel can fully charge a 500Wh power station in a single sunny day,
significantly improving outdoor independence and convenience.

7️⃣ GTPOW’s Philosophy: Greener, Smarter, More Reliable Energy

GTPOW is driven by innovation to make clean energy accessible to everyone.
From high-efficiency TOPCon cells to bifacial designs, robust housings, and intelligent interfaces,
every GTPOW product reflects one mission: to make green energy go farther.

“GREEN POWER TO PROTECT OUR BLUE PLANET.”
— Using green power to protect our blue planet.

At GTPOW, efficiency is not a luxury — it’s a promise.
We will continue exploring next-generation photovoltaic technologies
to make solar power a truly reliable and sustainable choice for everyone.

8️⃣ Conclusion

A 25% conversion rate represents not only GTPOW’s engineering excellence,
but also our commitment to a cleaner, smarter, energy future.

When every outdoor trip, every camping night, and every recharge
is powered by pure sunlight — that’s the truest meaning of technology serving life.

GTPOW · Redefining Portable Solar Power.
Power your world — with the brilliance of the sun.