esp-solar-contoller

esp8266 and esp32 based solar controllers targetting Houses with a fronius solar system (other inverters can be supported).

Inspired by the various DIY powerwalls

https://www.facebook.com/groups/diypowerwalls/

Use

Common Day devices:

• Pool Pump
• powerwall / UPS / Battery Bank charger
• roof exhuast fan

Common Night time Devices:

• UPS mains disconnect
• Grid tie inverter turn on

Example Applications

Simple

(day) Turn on day time device when PV export is greater than device size (eg pool pump)

DIY Powerwall

(Day) Turn on charger when PV export is greater than charger size.

(night) Turn on inverter when power import is larger than inverter size.

UPS

(Day) Turn on charger when PV export is greater than charger size.

(night) disconnect UPS mains if house is drawing power from the grid.

Features

• Self hosted solution, no external servers needed everything runs on the microchip.
• Complete Web Interface for confguration and monitoring.
• JSON config file for easy manual editing.
• OLED display
• Support querying Fronius inverters directly
• NTP time sync
• Fallback WiFi network settings.

Battery Monitoring (esp32)

• High voltage disconect (day)
• Low Cell Voltage disconnect (night)
• High temp shutdown

esp8266

Supporrt for all common esp8266 boards.

• sonoff
• IoT Yunshun
• Anything tasmota runs on.

Supports adding OLED display the above.

ESP32 Board

Custom designed board.

• 16 Bit 4 channel ADC fed to 4 8x analog signal multiplexers allowing for a total of 32 analog lines.

• 16 Voltage monitoring lines.

• 16 ntc temp sensors + 1 ambient temp sensor.

• SD Card for config storage.

• Simple Oled display.

• Piezo buzzer.

• 5v & 3.3v i2c headers for expansion.