Key benefits — why you need this controller Protects your battery and solar array automatically: temperature, overcharge, low-voltage and PV protections reduce risk of damage and extend battery life. Maximizes solar harvest: true MPPT tracking extracts more power from your panels than PWM controllers. Easy to install, monitor and expand: compact wall-mount design, app support for iOS/Android, and parallel capability for larger systems. Main functions and protections Temperature protection: shuts down at 75°C / 167°F to prevent thermal damage. Fan control: fan turns on above 45°C / 113°F and turns off below 40°C / 104°F for efficient cooling and low noise. PV reverse-polarity protection: provided for PV open-circuit voltage (Voc) below 100V. PV over-voltage warning: PV Voc above 180V will burn through the controller — do not exceed 180V Voc. Battery protections: over-charge power protection, battery overcharge voltage protection, and battery low voltage protection. Output current limit protection and over-temperature protection to prevent overload and overheating. Performance and charging 100% MPPT regulator with intelligent Maximum Power Point Tracking technology for higher solar efficiency. Built-in, high-performance controller with automatic battery voltage detection: supports 12V, 24V and 48V systems. Three-stage charging (bulk, absorption, float) to optimize battery performance and life. Multifunctional LCD(s) for clear status, parameters and alerts. Configure system parameters remotely and view real-time data online via compatible iOS and Android apps. Installation, expandability and compatibility Easy wall mounting with compact footprint. Supports parallel connection of multiple units without requiring additional external devices; no forced limit on number of controllers connected in parallel. Suitable for lead-acid battery types including flooded (ventilated) and gel batteries. Indoor use only (see protection and environmental specs below). Build quality, size and environmental specs Housing with industrial-grade components and forced air cooling. Acoustic noise: less than 40 dB. Size: 21.5 x 11.5 x 5 cm. Net weight: 1.3 kg. Protection category: IP21 (indoor use). Operating temperature: -20°C to +55°C. Storage temperature: -40°C to +75°C. Meets standards: EN 62109-1, EN 60730-1, EN IEC 61000-6-3, EN IEC 61000-6-1. Practical use scenarios 1) Off-grid cabin or small home: Combine with a solar array and a 12V/24V/48V battery bank to maximize solar charging, protect batteries from overcharge and low voltage, and monitor performance via the app. 2) Caravan / RV power management: Compact size and low noise make it suitable for indoor installation in vehicles (within operating temperature limits) to manage battery charging from roof panels and prevent battery damage. 3) Backup power for equipment racks or small telecom sites: Use parallel units to scale charging capacity for larger battery banks while maintaining temperature and over-voltage protections. Important notes and safety Do not exceed PV open-circuit voltage (Voc) of 180V; exceeding 180V can burn the controller. PV reverse-polarity protection applies only when Voc is below 100V. Intended for indoor installation and for use with compatible battery types as listed.