Reliable automatic solar charging and lighting control: charges connected lithium batteries during daylight and switches lights on at dusk and off at dawn without relying on photosensitive components. The module senses solar panel voltage to manage charging and output, reducing false triggers from ambient light and ensuring consistent nighttime operation. Broad voltage and battery compatibility: designed to work with common lithium battery systems including 3.2V, 3.7V, 4V, 11.1V and 12V. Suitable for a wide range of outdoor lighting equipment, from singlecell lawn lamps to multicell string lights. Simple, intelligent operation: the circuit detects voltage changes from the solar panel to determine sunrise and sunset, then automatically enables or disables the light output. This dawn/dusk switching provides handsoff energy management and reliable performance in changing light conditions. Durable, compact construction: built as a small circuit board module from quality materials for long service life in outdoor installations. Compact size makes it easy to fit inside garden lights, pathway fixtures, or decorative lighting housings. Practical performance benefits: extends battery runtime by preventing daytime drain, reduces maintenance by automating charge/discharge cycles, and provides consistent lighting behavior without external light sensors. Typical applications Solar garden and pathway lights: or upgrade the control module in lawn lamps to improve charging reliability and automatic on/off switching. Decorative string lights and festival lighting: power and manage colorful string lights or LED ropes that use 3.7V to 12V battery packs, enabling automated evening operation. Small solar street or pathway setups: suitable for compact solar street lights or remote pathway fixtures where a simple, robust charging and dusk/dawn control is required. What this solves Eliminates the need to manually switch lights or install separate photosensors. Prevents daytime battery drain by ensuring charging is prioritized during sunlight and lights remain off until night. Provides a compact, compatible module that fits a variety of outdoor lighting systems for reliable, lowmaintenance operation.