lead-acid

Experimental STM32G474-based high-current battery charger and programmable synchronous buck converter. KiCad hardware and STM32CubeIDE firmware.

Professional battery charger controller for OWON SPE3102 SPE3103 SPE6205 power supplies with Raspberry Pi, MQTT integration, and energy accounting

How does an inverter or UPS work? An interactive, open-source explainer. Glassbox No. 009.

Browser-based calculator for VRLA lead-acid battery testing — cycle life vs. temperature, IEC 60254-1 / ISO 7176-25 acceptance criteria, charge voltage compensation. Single HTML file, no install.

Coulomb-counting battery monitor on ESP32-C6 with dual INA219 shunt sensors: fuel gauge for eight chemistries, OLED, full console over BLE, Android app and a touch-screen remote display. OTA updates with rollback.