Serving as standalone power source, extended-run UPS, or inverter, APSX4048SW inverter/charger can be operated in single-phase mode and supports 3-phase mode suited for high-capacity industrial and commercial installations. Transformer design lets unit power resistive electronic loads or large inductive motors, compressors, and other items with high current demands on startup. For increased capacity, up to 7 units can be configured in parallel connection.