Please note that as the BMS,after a lipo battery installed, a charging action is needed to active the BMS, to make the battery Output nomrally.

3.7V Power supply, which is the standard output voltage for lipo battery, is popular used in electronic hardware, this power solution for 3.7V system, suitable for applications in agriculture/ farm, to support long-term stable 3.7V power supply.

With the MPPT(maximum power point tracking) charger, it tracks the best point of charging voltage/current, to ensures maximize the performance of solar panels. I can be also charged by 5V~28V DC input, as a standard lipo battery charger.  It outputs lipo voltage 3.7V voltage with 2.0mm connector, with protective circuit(BMS).

This product comes with a 1W 5.5V solar panel, the max current, as tested, can be up to 160mA; Besides standard connector for lipo(PH 2.0mm ),there 2 cells holder (18650) on the board parallel connected, you can install 1 or 2 batteries depends on your needs. With the default solar panel, The whole system suitable for long-usage projects that have average current request lower than 20ma, if your application need larger current, you can update a bigger solar panel for stronger power ability.

Features:

• Standalone Li-ion Battery Charger with Photovoltaic Cell MPPT Function
  
• Wide Input Voltage: 4.5V to 28V
• Constant Voltage: 4.2V±1%
• Automatic Recharge
• Charging Status Indication
• Operating Ambient Temperature －40℃ to ＋85℃
• Voltage of MPTT: 4.82V
• Charge Current Up to 4A
• Input: DC-005 5.5mm*2.1mm Jack or PH2.0-2P Connector
• Output: 18650 socket or PH2.0-2P Connector
• BMS: over-charge, over-discharge protection
• Solar Panel：1W/5.5V

 Working Status:

Package Includes:

• 1 x Makerfabs 3.7V Power Solution with MPPT Solar panel