2025-07-10
The 3.2V system uses a single LiFePO₄ (Lithium Iron Phosphate) battery cell, operating within a voltage range of 2.5V to 3.65V. This setup is common in low-power solar street lights (typically under 30W), where simplicity and cost-efficiency are prioritized.
Simpler & Lower Cost
Requires a basic Battery Management System (BMS) without complex balancing circuits.
Fewer components mean lower manufacturing and maintenance costs.
Higher Efficiency for Low-Voltage LEDs
If the LED driver operates at ~3V, there’s no voltage conversion loss (unlike 12V/24V systems that need step-down converters).
Ideal for small solar lights (e.g., garden lights, pathway lights).
Improved Safety
Lower voltage reduces risks of short circuits, overheating, and fire hazards.
LiFePO₄ chemistry is already safer than other lithium batteries (e.g., Li-ion).
Compact & Lightweight
Single-cell design allows for smaller battery enclosures, making installation easier.
Power Limitations
Higher current is needed for the same power output (since Power = Voltage × Current).
This leads to more energy loss in wires (copper losses) and potential overheating in high-power applications.
Not Suitable for High-Wattage Lights
Struggles with LEDs above 30W due to excessive current draw.
Thicker, more expensive wiring is needed to minimize losses.
Limited Compatibility
Most off-the-shelf solar controllers and LED drivers are designed for 12V/24V, not 3.2V.
Custom solutions may be required, increasing complexity.
Shorter Cable Runs
Due to higher current, long-distance wiring is inefficient—best for short-range installations.
✔ Low-power solar lights (5W–20W)
✔ Decorative & garden lighting
✔ Cost-sensitive projects where simplicity is key
✖ High-power street lights (30W+)
✖ Long-distance wiring setups
✖ Applications needing standard 12V/24V compatibility