40W V2.6 Mini UPS Board for Router and ONU

Mini Router UPS Board 40W V2.6 with Auto Switchover for Bangladesh

The Mini Router UPS Board 40W V2.6 is a high-performance, compact uninterruptible power supply module engineered specifically to combat frequent load-shedding challenges in Bangladesh. Built with premium-grade SMD components, this versatile circuit board ensures your essential networking hardware—such as internet routers, fiber optic ONUs, and IP security cameras—stays powered without interruption. With its instant, zero-delay automatic switchover feature, devices will not restart when mains power fails, maintaining a stable, continuous internet connection. Whether you are a DIY electronics enthusiast working on a custom power bank project or looking for a reliable backup solution for your home or office setup in BD, this robust module from Bigyan Project delivers exceptional stability and safety.

Technical Specifications

Key Features

• Instant Failover Switching: Seamless automatic transition to battery power during load-shedding prevents connected routers or ONUs from rebooting.
• Multi-Voltage DC Outputs: Equipped with simultaneous 12V, 9V, and 5V outputs to power different electronic devices from a single board.
• Comprehensive Safety Protection: Integrated safeguards against short-circuits, output over-voltage, input reverse polarity, and sudden high-voltage surges.
• Real-Time LED Indicator: Built-in four-level LED system displays remaining battery capacity at 100%, 75%, 50%, and 25%.
• Thunder & Surge Protection: Designed to withstand electrical spikes and lightning-induced surges common in tropical climates like Bangladesh.
• Compact SMD Design: Utilizes high-density SMD components to achieve maximum thermal efficiency and high output power within a small footprint.

Applications & Use Cases

• Home and Office WiFi Router Backup: Keeps your primary broadband wireless routers running continuously.
• Fiber Optic ONU / ONT Backup: Powers the fiber optical network terminal alongside the router for uninterrupted internet access.
• IP & CCTV Camera Continuous Power: Ensures continuous operation of surveillance cameras during security-critical power failures.
• Smart Home Hubs & IoT Gateways: Provides reliable, long-term standby power for automated systems.
• DIY Electronic Science Projects: Ideal for students and hobbyists building portable power stations or specialized DC backup rigs.

User Guide / How to Use

• Step 1 (Battery Connection): Assemble a high-quality 3S (11.1V nominal) Li-ion 18650 or LiPo battery pack. Carefully connect the positive (+) and negative (-) leads to the designated battery input terminals on the board.
• Step 2 (Power Input): Connect a reliable 12.6V to 13.0V DC power supply adapter (capable of delivering 2A to 5A) to the input port to charge the batteries and supply main power.
• Step 3 (Device Output Connection): Connect your router, ONU, or camera to the corresponding output ports (12V, 9V, or 5V) using compatible DC jack cables.
• Step 4 (Monitoring): Observe the onboard LEDs to monitor the charging progress and verify battery health during operations.

Frequently Asked Questions (FAQs)

• Q: Will my router restart when the mains power cuts out?
  A: No. The board features instant switchover, meaning there is zero delay and your router will continue running smoothly without restarting.
• Q: Can I use a 12V adapter as the input source?
  A: To fully charge a 3S lithium-ion battery pack to its capacity, a regulated input source of 12.6V to 13.0V is highly recommended. A standard 12V adapter may fail to charge the battery pack fully.
• Q: What happens if I connect the battery polarities backward?
  A: The board includes reverse polarity protection to prevent damage, but it is always recommended to double-check terminal connections before powering up.
• Q: Can I run a 12V router and a 9V ONU at the same time?
  A: Yes. The board supports simultaneous multi-voltage output across all ports, provided the total load does not exceed the maximum power limits.

Challenges and Considerations

• Strict Input Voltage Limit: Operating the board with an input voltage higher than 13.0V can cause permanent damage to the charging circuitry.
• Heat Dissipation: When running at maximum load (near 47.5W), ensure the module is placed in a well-ventilated housing to prevent overheating.
• Battery Cell Matching: Always use identical, high-quality 18650 cells with matched capacity and internal resistance for the 3S pack to maintain balanced charging.

Compatibility

• Networking Hardware: Fully compatible with major brands of routers and ONUs used in Bangladesh (including TP-Link, Netis, Mi, Tenda, Totolink, Huawei, and ZTE).
• Battery Chemistry: Optimized for 3S configuration Lithium-Ion (18650 cells) and Lithium-Polymer battery chemistries.
• DC Jacks: Uses standard DC barrel connectors matching most consumer-grade routers and modems.

Future Enhancement Options

• External Cooling Fan: A small 5V auxiliary cooling fan can be connected to the 5V port to actively cool the board during intensive, continuous loads.
• External Battery Management System (BMS): While the board features low-voltage cutoff, adding an individual BMS on the 3S battery pack provides an extra layer of cell-balancing safety.
• Custom Enclosure: Designing and 3D printing a custom ventilation casing to house both the UPS board and the 18650 battery pack together.

Benefits

• No Offline Downtime: Keeps your remote work, online classes, and online freelancing projects active during electricity cuts.
• Device Longevity: High output stability with ±0.05V tolerance protects sensitive modems and cameras from erratic voltage spikes.
• Cost-Effective: Eliminates the need to buy separate commercial UPS units for each DC networking device.
• Local Project Friendly: Sourced locally from Bigyan Project, making it highly accessible for academic DIY designs and local custom power assemblies in BD.

Conclusion

The Mini Router UPS Board 40W V2.6 is a comprehensive, efficient, and space-saving solution designed to combat everyday power instabilities. By combining multi-port DC outputs, highly accurate voltage outputs, and robust protective circuitry, it eliminates the frustration of dropped internet connections. Extremely versatile and optimized for 3S lithium batteries, this module is the perfect choice for anyone seeking reliable, continuous backup for home networking setups and DIY electronics projects across Bangladesh.

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