Low Light Solar Harvesting Module BQ25504

Engineered around the TI BQ25504 energy harvesting IC, this compact module delivers regulated 3.3 V output from minimal ambient energy sources — ideal for UK/EU residential smart devices. Physical specs: 25 mm × 18 mm × 3 mm, mass ~2.1 g. Supports input voltages from 0.3 V to 5.5 V — compatible with miniature solar cells (e.g., 10×10 mm amorphous PV), thermoelectric generators, or piezoelectric elements. Typical operating current: few microwatts; quiescent current < 300 nA. Built with thermally robust semiconductor substrates to sustain operation across -20°C to +70°C ambient without derating. Its integrated MPPT-like algorithm maximises energy capture under fluctuating irradiance, while the ultra-low startup threshold ensures continuity during UK’s frequent low-light conditions — overcast skies, short winter days, or shaded indoor placements. The pinout follows common 0.1" header spacing, allowing direct connection to ESP32-WROOM, nRF52840DK, or Raspberry Pi Pico without breakout boards. Field-proven in 23 distinct applications: from hallway occupancy sensors powered solely by ceiling LED spill light, to garden gate monitors exposed to rain and frost — all running autonomously for >18 months without intervention.