The RESS PE20 is an all-in-one residential energy storage system (RESS) designed by Vollwert, featuring a highly integrated setup that combines Power Conversion System (PCS), Battery Management System (BMS), and Energy Management System (EMS) for enhanced stability and efficiency. It supports scalable battery capacities starting from 6.6kWh per module, with options for 1 to 3 modules (up to 19.8kWh system energy), and is compatible with high-power PV panels for seamless solar integration. Key features include quick-insert modular design for easy installation, a long lifecycle exceeding 7000 cycles, and robust connectivity options like app monitoring, web portal, and cloud integration for managing critical and general loads, grid interaction, and backup power during outages.

Technically, the system offers models with rated output powers from 3680W to 6000W, MPPT efficiency up to 99.9%, and maximum PV input up to 10000W, operating on lithium-ion batteries with a nominal voltage of 51.2V. It includes comprehensive safety protections such as anti-islanding, over-voltage/current safeguards, and IP66-rated enclosure for outdoor use in temperatures from -10°C to 55°C. With a 5-year inverter warranty (extendable to 10 years) and 10-year battery warranty, the PE20 ensures reliable performance for home energy storage, supporting grid-tied and off-grid scenarios while complying with international standards like IEC 62109 and EN 50549.