Product Description
OpenUPS2 – Intelligent DC UPS with LiFePO4 Battery Management
OpenUPS2 is an intelligent, microprocessor-controlled DC UPS designed to deliver a user-defined, regulated power output from a wide input voltage or integrated battery backup. It combines power path management, battery charging, and cell balancing into a single PCBA, eliminating the need for external battery wiring.
Battery cells are inserted directly into the device, simplifying installation and improving reliability. OpenUPS2 uses a high-efficiency synchronous boost converter with accurate voltage and current regulation, and automatically switches between adapter power and battery backup.
Key Features & Benefits
🔋 Advanced Battery Management
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Supports LiFePO4 battery chemistry
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3-stage charging: preconditioning, constant current, constant voltage
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Balances 3 series battery cells
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Integrated coulomb counting fuel gauge
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Battery temperature monitoring per cell with temperature-compensated charging
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Detects missing battery cells
⚡ Intelligent Power & UPS Functionality
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Input voltage range: 11–24V DC
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Programmable output voltage: 12–24V DC
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Booster-based design for precise regulation
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Automatic power path selection (adapter or battery)
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Ultra-low power consumption
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1µA in Deep Sleep
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530µA in Sleep mode
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⚠️ Note: V(In) must be ≤ V(Out). If V(In) exceeds V(Out), the output will follow the input voltage.
🖥 Communication & System Integration
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USB interface (Windows & Linux compatible)
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SMBus slave support
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Windows auto-detects OpenUPS2 as a standard battery device
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Battery status displayed in the Windows system tray
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No special drivers required
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API available for custom software integration
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Supports motherboard ON/OFF pulse for graceful system shutdown during low-battery conditions
Additional Hardware Features
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Start / Stop button
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Relay output
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External LED connection
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Programmable voltage thresholds
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Secondary battery status display in Windows
Electrical & Charging Specifications
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Charge voltage: 3 × 3.5V (LiFePO4)
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Charge current: 1A
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Precharge current: 0.3A
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Balances 3S battery configuration
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Supports fuel gauge reporting via USB
Li-Ion (3.7V) Battery Configuration (Optional)
OpenUPS2 can be configured for Li-Ion 3.7V batteries:
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Replace Resistor R20 with 576kΩ
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Charge voltage set to 12.168V (3 × 4.056V)
Ideal Applications
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Embedded systems
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Industrial controllers
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Network equipment
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IoT devices
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Mini PCs & SBCs
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Automation and backup power solutions
