Why MCS 012 3.0 matters — and why you can count on Renusol's certifications

MCS 012 is a UK certification standard set by the Microgeneration Certification Scheme (MCS) that applies to roof-integrated and building-mounted solar PV systems , specifically their interface with the building structure (such as mounting kits, flashings, and weatherproofing). Its purpose is to ensure that solar mounting products:

• Do not compromise the weather-tightness of the roof
• Are structurally sound and can handle wind and snow loads
• Are durable , corrosion-resistant, and long-lasting
• Are compatible with the overall fire and safety requirements of the roof

What's new in MCS 012 3.0?

Version 3.0 introduces tighter, more rigorous testing standards . Here are the key changes and updates:

Expanded scope & clearer definitions

• The standard now clearly covers roof-integrated and roof-mounted systems and introduces new classifications for systems (eg type 1, 2 and 3) to ensure more accurate evaluations.

Enhanced wind & snow load testing

• Testing protocols have been updated to reflect more realistic environmental loads, including climate change-related scenarios with stronger wind pressures.
• There's now a greater emphasis on simulating dynamic loads , like gusting and uplift, in addition to static weights.

Fire performance clarity

• Products must now clearly demonstrate fire performance in line with UK building regulations. This includes clearer guidance on how systems interact with roof coverings and fire-rated components.

Improved weatherproofing tests

• Flashings, seals and junctions must now meet tighter requirements to prove that they maintain weather tightness over long durations and under varied weather conditions.

Durability & corrosion testing

• There's a new emphasis on accelerated weathering and corrosion resistance, especially for metal components like rails, fasteners, and brackets.

Documentation & traceability

• Manufacturers now need to provide more comprehensive documentation , including material specifications, design assumptions and third-party test results.
• Installers benefit from clearer installation instructions backed by performance data.

With many in the solar‑mounting world still catching up, Renusol proudly holds the brand‑new MCS 012 3.0 certification for all products.

While many competitors await their MCS 012 3.0 upgrades, you can specify Renusol with full confidence in compliance and performance. This latest MCS standard underlines our commitment to rigorous testing — ensuring long‑term reliability, structural integrity under dynamic loads and superior corrosion protection.

Products in the spotlight

Whether you're planning a large-scale commercial setup or a streamlined residential system, our modular solar-mounting systems continue to push the boundaries of performance and ease of use.

Meet the VS+ End Cap Universal (black)

Renusol VS+ is suitable for almost all types of pitched roofs in Europe. Now, our brand‑new VS+ End Cap Universal (black) — product code 900276 — unifies what used to be 'left' versus 'right' caps into a single component that can be used for both.

• One part fits all: works seamlessly as both a left and right version with 50 × 37 mm and 41 × 35 mm VarioSole+ rail types.
• Instant swap‐out: we're immediately replacing the old black caps in our catalog.

Explore our VS+ pitched‑roof range to see just how effortless this upgrade is.

PV‑Configurator updates: portrait mode & new FS Pro components

Your favorite planning tool just got even smarter. In the latest PV‑Configurator release, we've added the following:

1. Portrait orientation for FS Pro . Now, you can configure vertically oriented modules in a streamlined workflow, opening up new design possibilities.
2. Updated recommended components . We've refreshed our default FS Pro parts list to reflect the very latest components.

Log in to your PV‑Configurator account today to try out these enhancements and generate updated BOMs in seconds.

Intersolar Europe 2025

Munich is a great place to be in May — especially for solar pros! We had a great time attending this year's event, where we showcased the FS Pro : the new standard for flat roofs with an exceptionally high degree of pre-assembly.

If you missed us at the show, get in touch to find out more about our solar mounting solutions.