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The Fronius Selectiva 3.0 4020 2 kW is an advanced 48 V battery charger in the innovative Selectiva 3.0 series. Incorporating Active Inverter Technology and the Ri-charging process, it customizes the charging characteristics to each battery's age, temperature, and state of charge. This ensures an optimal and gentle charging process that significantly extends battery life and reduces energy costs.Delivering an output current of 20 A and a power output of 2 kW, the Selectiva 4020 efficiently charges a variety of lead-acid batteries. Its compact size (341 x 198 x 110 mm) and lightweight design (6 kg, including leads) make it easy to install and handle. Operating on a mains voltage of 1 x 230 V AC (-15%/+15%) and drawing 8 A of current, it includes a 2.5 m mains lead and a 3 m charging lead for flexibility and convenience.Key features include a USB interface for effortless software updates and system analysis, a calendar function for scheduled charging to take advantage of lower energy tariffs, and options for opportunity and fast charging with a simple button press. The charger also offers a deep discharge characteristic for fully recharging deeply discharged batteries and automatic battery voltage detection for ease of operation.With a high protection class of IP21, the charger is built for durability and safe operation in various conditions. As part of the Fronius Selectiva 3.0 product family, the Selectiva 4020 is designed to optimize the charging process according to each battery's unique requirements, thereby extending battery service life and reducing costs.Additional features include a refresh characteristic to improve the performance of weak batteries, visualization of the coolest battery via a blue LED indicator signaling a fully charged and cooled battery, and temperature-controlled charging to adapt the charging voltage based on the battery temperature for sustained protection and extended service life.Backed by Fronius, a reputable brand in energy solutions, the Selectiva 4020 is a reliable solution for battery management and recharging needs in the electrical and energy sector.