2000VA/1800W Uninterruptible Power Supply (With built-in battery) * Double conversion on-line design with input power factor correction (PFC) technology, achieving an input power factor of up to 0.99. * Digital control system for enhanced stability and reliability. * ECO operation mode for improved energy efficiency and reduced user costs. * Three-stage charging: constant current charging, constant voltage charging, and floating charging stages are intelligently managed. * Wide voltage input and frequency range for stable operation with different electrical scenario, and suit with various fuel generators. * Comprehensive protections including output overload, output short-circuit, over- temperature, battery under-voltage warning, battery over-charging protection, and power-on self-diagnostic function;