A homeowner in Augsburg has paired 270 kWh of BIWATT sodium-ion storage with 49 kWp of solar, creating a fully off-grid household energy system with local distributor SALZSTROM providing the solution.
A homeowner in Augsburg, Germany, wanted to run their house without a connection to the public grid. The system needed to cover household demand day and night using only onsite solar and battery storage.
The basement installation made battery safety an important part of the choice. The homeowner had concerns about installing a large lithium-ion battery system indoors and asked SALZSTROM, BIWATT’s local distributor, about alternatives. SALZSTROM proposed a sodium-ion solution based on BIWATT R2 batteries and H3 hybrid inverter.
The installation pairs a 49 kWp PV array with 270 kWh of storage. It uses 60 BIWATT R2 sodium-ion battery units and four 12 kW BIWATT H3 inverters, providing 48 kW of inverter power.
Safety and environmental impact were key factors in the battery choice. BIWATT’s sodium-ion chemistry offers greater thermal stability and a lower risk of thermal runaway than LFP, addressing the homeowner’s concerns about a large indoor battery installation.
