DFRobot Micro 3.3V Solar Set

This Solar Power Manager Micro from DFRobot is a highly efficient solar power management module for 3.3V projects with small power requirements. You can use it to power IoT-based wireless sensors or 3.3V microcontrollers such as FireBeetle ESP32 or ESP8266. The module has extremely low power loss and charges your 3.7V LiPo cells highly efficiently via MPPT (Maximum Power Point Tracking).  MPPT is capable of maximizing the conversion efficiency of solar energy under weak sunlight. This feature allows wireless microcontrollers with low power consumption to be charged solely by solar energy and to be operated autonomously outdoors without constantly replacing the battery. The module can charge a 3.7V Lipo battery via solar or USB and provides a charging current of up to 70mA or 100mA. A 3.3V 90mA regulated output can provide the required current for most low-power wireless devices during transmission or reception.  The module has built-in overcharge and undercharge protection devices to perfectly protect the battery and achieve a long battery life. 

If you want to connect a 3.3V microcontroller such as the FireBeetle ESP32 or ESP8266, you must connect the controller in parallel to the Lipo through the Lipo connection of the microcontroller board. The reason is that the ESP32 temporarily draws more than 90mA of current when sending data.

Features Solar Set DFRobot Micro:

• MPPT algorithm with constant voltage ratio, maximizing the conversion of solar power
• Designed for 1V to 3V small solar panels
• Ultra low power design
• Charging 3.7V Lipo via Solar or USB
• Deep discharge protection for 3.7V Lipo battery
• Overcharge protection for 3.7V Lipo battery

Documentation:

• DFRobot Wiki
• Layout Drawing
  
• Schematic
  
• Datasheet SPV1050

Technical Details:

Charge Controller Module

• Solar Power Management IC: SPV1050
• Solar input voltage (SOLAR IN): 0.5V to 4V
• Battery input (BAT IN): 3.7V Lithium battery
• Maximum charging current USB IN: 100mA
• Maximum charging current Solar IN: 70mA
• Overcharge protection threshold: 4.2V
• Undercharge protection threshold: 3.1V
• Regulated power supply: 3.3V 90mA
• Output current Parallel Lipo: BAT IN 3.7V
• Quiescent current: <3 uA
• Protection Features
• Operating temperature: -40°C to 85°C
• Dimension: 30.0mm x 30.0mm

Solar Module:

• Nominal Voltage (VMP): 2V
• Nominal Current (IMP): 160mA
• Open circuit voltage (IOC): 2.4V
• Short circuit current (ISC): 190mA
• Solar cell material: Monocrystalline silicon
• Additional Features: Waterproof, oil-resistant and corrosion-resistant
• Dimension: 50mm x 50mm 

Package Includes:

• 1x Solar Charge Controller Micro 3.3V
• 1x Monocrystalline Silicon Solar Module 2V 160mA
• 2x Red wire 15cm 24AWG
• 2x Black wire 15cm 24AWG
• 1x PH2.0-2P connector power cable 15cm
• 2x Pin header 1x2Pin