Contact person: Business Client

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Location: Hyderabad, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I am building a custom portable hybrid inverter / power station and need a developer to create the complete ESP32 firmware + basic web dashboard for system monitoring and automation.
The ESP32 will manage power inputs, outputs, battery monitoring, and system protection features.

Hardware I currently have:

160x 18650 NMC cells (3S, ~1500mAh each)

3S 100A BMS

500W inverter (AC output)

ESP32 (main controller)

Bluetooth 2×50W audio amplifier + speakers

Adjustable buck converters

USB-PD output module

DC barrel outputs + XT60/XT120

Solar input

SMPS input

USB-PD input

Car 12V DC input

External battery (car battery) support

Current sensors (Hall or shunt)

Voltage dividers for sensing

GPS module (optional but desirable)

50W COB LED module


Project Requirements:

1. Power Input Management

ESP32 must monitor and manage the following input sources:

Solar

SMPS adapter

USB-PD

Car 12V input

External battery input (with pre-charge logic)


Features:

Automatic source detection

Priority selection (solar → external → SMPS → USB-PD, etc.)

Safe pre-charge control before connecting external battery

Inrush protection control (MOSFET/relay)

Control signals for enabling/disabling chargers or relays



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2. Battery + Power Monitoring

Measure internal battery voltage

Measure external battery voltage

Measure current in/out using Hall or shunt

Monitor BMS data (UART/I2C if supported)

Track SOC, estimated runtime, input power, output power

Overcurrent/overtemp auto shutdown logic



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3. Output Management

Control & monitor:

500W inverter (via enable pin or relay)

DC barrel outputs

USB-PD output

Adjustable buck converters

High-power XT60/XT120 ports

50W COB LED (brightness control optional)



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4. Communication & Interface

Required:

Web dashboard (ESP32 WiFi AP + STA)

Display all voltages, currents, temps, SOC, power flow

Manual control toggles (turn on/off inverter, LED, outputs)

Real-time graphs (optional but preferred)

Bluetooth audio control (basic integration OK)

OTA firmware update



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5. GPS Integration (optional but preferred)

Read GPS position and time

Display location on dashboard

Log events with timestamp



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6. Event Logging & Safety

Logs for: source changes, faults, shutdowns, battery status, temperatures

SD card logging OR internal flash log

Emergency cutoff logic (overcurrent / overtemp / low voltage)



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7. Deliverables

Complete ESP32 firmware (Arduino or ESP-IDF)

Full source code

Connection diagrams for all GPIOs

Documentation for setup, compiling, wiring and configuration

Optional: dashboard UI HTML/CSS/JS files



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Skills Required

ESP32 (Arduino or ESP-IDF)

Power electronics control logic

Voltage/current sensing

Web UI development

Experience with battery systems strongly preferred" (client-provided description)