The best solar guarantee. Now standard at BISOL

As of 1 August 2025, BISOL^® offers an upgraded warranty that sets a new benchmark for performance and trust in the solar industry.

This is not a promotional slogan. It is a confident commitment from Europe’s largest premium solar module manufacturer, backed by more than 20 years of real-world results and one of the lowest complaint rates in the industry.

What the new guarantee includes?

• 30-year power output guarantee, linear to 90%

• 25-year product guarantee

• Verified real-world performance: only 0.01 % degradation after 20 years

• Hail resistance: Ø 40 mm at 99.1 km/h (HW4 certified)

• Snow load: up to 11,000 Pa (BSO series)

• Wind load: 2,400 Pa

• 3 bypass diodes, MC4-compatible connectors

• 100% designed and manufactured in EU

Why this matters?

BISOL’s new guarantee terms are not industry standard. They are the exception, and they redefine the standard. They are not based on projections or lab simulations, but on real-world results.

This is a reflection of long-term quality, not theoretical estimates.

Other manufacturers test a few samples. BISOL’s data comes from nearly two decades of consistent operation, including on our own rooftop, where BISOL modules still perform after 20 years with just 0.01% measured degradation.

See the BISOL degradation story.

Premium european technology that stands behind every module

BISOL is Europe’s largest solar module manufacturer. Its products operate in more than 120 countries and are manufactured under full internal control, with no outsourcing.

This is not just a longer guarantee. It is the result of decades of performance in real installations, backed by control of every step in the production process.

Who the new guarantee applies to?

• All standard BISOL modules, including BDO, BBO and BSO

• All new orders

• Globally applicable

• Already included in all updated datasheets and price lists

What it means for you?

For end users and investors:

• Guaranteed long-term energy production

• Higher system value and lower lifetime cost

• Peace of mind backed by 100% European manufacturing

For installers and EPC partners:

• Fewer service calls over the system lifetime

• Stronger credibility with clients

• A key differentiator in competitive projects

Start your next project with the strongest guarantee in solar.

Guarantee summary

This new guarantee applies to standard BISOL modules only.

BISOL Supreme™ continues to offer the world’s only 100% power output guarantee for 25 years, without degradation. It remains in a category of its own.