NetSure MiniUPS Pro is an intelligent inline power module designed for routers and modems — keeping your internet alive through every power cut. Engineered by Prakhar Bandi.
Designed by Prakhar Bandi · github.com/prakharbandi ↗
Every time the electricity fails, your router dies — and so does your work, your calls, your smart home, your security system. Existing solutions are either overkill or brainless.
Designed for desktop PCs, they're bulky and expensive for a 10W router.
No status display, no health monitoring, no visibility into what's happening.
Remote work, smart devices, and video calls cannot tolerate unexpected drops.
You never know remaining runtime or charge cycles — until the battery dies.
NetSure MiniUPS Pro is an intelligent inline power module that sits between your wall outlet and router — automatically switching to battery backup when mains power fails. Engineered with thoughtful hardware design and a clean embedded software stack.
The ESP32 microcontroller continuously monitors mains voltage and battery state. On detecting a power cut, it switches the load to battery automatically. A small OLED display provides live status — battery level, output voltage, and estimated remaining runtime.
When wall power drops, the system automatically routes load to battery — no manual action needed, no interruption to your router.
POWER PATHDual-core 240MHz microcontroller manages switching logic, battery monitoring, OLED display, and WiFi connectivity — running on FreeRTOS.
EMBEDDED128×64 display shows battery percentage, output voltage, current load, and estimated time remaining on backup power.
DISPLAYINA219 sensor tracks voltage and current draw in real time. State of charge is estimated and displayed continuously on the OLED.
SENSINGBuilt-in WiFi allows status push to a local dashboard or phone alert when a power cut is detected — no cloud dependency required.
IOTDesigned to support 9V and 12V router outputs. Battery pack is user-replaceable. Architecture kept modular for future hardware revisions.
HARDWAREThe architecture is clean and purposeful — every block serves a specific function with minimal complexity.
How power flows from wall to router, and how the system bridges to battery on mains failure.
The ESP32 runs two concurrent FreeRTOS tasks to keep sensing, switching, display, and connectivity running in parallel.
Minimal connectivity stack — local-first, no cloud dependency required.
A simulated view of the OLED display and status metrics during a live backup session.
NetSure is an early-stage hardware startup concept — currently at architecture and PCB design stage, moving toward prototype and validation.
Market analysis of existing solutions. Identified core pain points. Defined product requirements and target hardware stack.
Schematic design completed. Power path, MCU board, and battery module architecture finalized. Component selection and BOM drafted.
ESP32 firmware being written — switching logic, battery monitoring via INA219, OLED display driver, and WiFi status push.
First physical prototype. PCB fabrication, component assembly, end-to-end hardware + firmware validation. Measure real switching behavior and battery performance.
3D-designed enclosure, labeling, user documentation. Refine based on prototype learnings. Prepare for wider demo and feedback.
If validated, explore small-batch production, crowdfunding, or ISP bundle partnerships. Build the mobile app. Launch NetSure as a real product.
Post-prototype ideas — features that make sense after v1 is validated.
iOS and Android app for real-time battery status, power cut history, runtime estimates, and instant alerts when backup activates.
Use discharge curve data to estimate battery degradation and predict remaining useful life — so you know when to replace before it fails.
A solar charging variant for off-grid deployments, rural areas, and sustainability-focused users — extending runtime indefinitely during daylight.
Native integration with Home Assistant for smart home users — triggering automations, logging outage events, and dashboard visibility.
Partner with internet service providers to include NetSure with broadband plans — making reliable backup power a default expectation, not an afterthought.
Expanded output for powering router + switch + small NAS or security camera simultaneously — covering the full home networking stack.
NetSure MiniUPS Pro is an active engineering project. Schematics, firmware progress, and build updates are documented on GitHub.