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WSAL16120 – Solar Power Manager/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare Solar Power Manager (SKU WSAL16120) manages charging of 3.7V lithium batteries from 6-24V solar panels or USB inputs. It supports MPPT and provides 5V outputs for low-power IoT projects.

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Technical overview

  • Uses the CN3791 as the solar charging management chip; suitable for 3.7V lithium batteries with 6-24V solar panels.
  • Supports MPPT (Maximum Power Point Tracking) to maximize solar panel efficiency.
  • Charging inputs: DC-002 jack or screw terminal for solar input; USB input (Micro-USB or Type-C depending on variant).
  • Outputs: USB port for 5V/1A and pin header for 3.3V or 5V; both outputs can be powered simultaneously.
  • Multiple protection circuits: overcharge, over-discharge, reverse polarity, overheat, overcurrent.
  • Operating temperature range: -40°C to 85°C.
  • The MPPT SET dip switch on the back is set to the solar panel input level, e.g., 9V for a 9V panel.
  • Maximum charging power is about 5W; full charge via USB (5V/2A adapter) takes about 1 hour, via solar under optimal conditions almost 2 hours.

Notes and version constraints

  • Only rechargeable 3.7V lithium batteries are supported; LiFePO4 (3.2V) is not supported.
  • The module does not work without a battery; both charging and discharging require a connected battery.
  • Do not occupy both battery positions (14500 holder and PH2.0 connector) at the same time; use only one battery per operation.
  • For iPhone charging, the D+/D- pins on the USB output must be shorted (weld a 0R resistor); without this modification, Apple devices will not charge.
  • The module is intended for low-power IoT; powering a Raspberry Pi is not recommended.
  • The main switch must be on for charging and discharging to work; when off, the module behaves as if the battery were removed.
  • Exact compatibility with specific battery sizes/capacities should be verified before purchase; the source does not provide a complete compatibility list.

Source and revision record

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