Li-ion Home UPS Firmware Development

**Project Title:** Firmware Development for Li-ion Home UPS (Renesas MCU)

We are looking for an experienced Embedded Firmware Engineer/Freelancer to develop firmware for a Li-ion Home UPS product using a Renesas microcontroller.

**Project Details:**

* Product: Li-ion Home UPS
* Rating: 1250VA / 12.8V (4S LiFePO4 Battery)
* MCU: Renesas
* Topology: Low Frequency Transformer Based Home UPS

**Scope of Work (3 Stages):**

**Stage 1:**

* ADC implementation (Battery Voltage, Current, Temperature)
* LCD Display Development
* Relay, Fan, and Buzzer Control
* Fault Code Display

**Stage 2:**

* SPWM Generation
* Inverter Control
* Battery Charging Algorithm
* Mains Changeover Logic
* Protection Features (Overload, Short Circuit, Low Battery)

**Stage 3:**

* BMS Communication
* Backup Time Estimation
* Data Logging
* Advanced Features and Production Support

**Requirements:**

* Experience with Renesas MCUs
* Experience in Home UPS/Inverter firmware development
* Knowledge of SPWM, Battery Charging Algorithms, and Power Electronics
* Ability to provide complete source code, documentation, and programming support

Existing Home UPS models and hardware references will be shared with the selected freelancer.

Please share:

* Relevant project experience
* Development timeline
* Commercial quotation
* Support period after delivery

Looking forward to working with experienced embedded engineers.