Fronius is an Austrian manufacturer specializing in welding technology, photovoltaics (solar inverters and storage), and battery charging technology since 1945.
Fronius International GmbH is a global leader in innovation and technology, originally founded in 1945 in Pettenbach, Austria. From its humble beginnings as a specialist repair shop, Fronius has grown into a major industrial force operating through three specialized business units: Perfect Welding, Solar Energy, and Perfect Charging.
Renowned for engineering excellence, Fronius manufactures high-efficiency solar inverters, battery storage systems, and intelligent welding equipment. The brand promotes a vision of 24 hours of sun, focusing on technologies that generate, store, distribute, and consume renewable energy efficiently. Their consumer lineup includes the popular Fronius GEN24 Plus hybrid inverters, Wattpilot EV chargers, and a wide array of professional welding systems.
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User manuals and technical documents are available on the official Fronius website under the 'Downloads' section or via the manuals.fronius.com portal.
You can register your device online at warranty.fronius.com using the serial number of your product to activate warranty extensions.
This is often due to loose connections or incorrect configuration settings. Ensure the primary meter is set to Modbus Address 1 and the secondary (if present) to Address 2, and that the settings in the Solar.Start app match the installation.