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 low power. You can use it to power IoT-based wireless sensors or 3.3V microcontrollers like 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 able to maximize the conversion efficiency of solar energy under weak sunlight. This feature makes it possible for low-power wireless microcontrollers to be charged by pure solar energy and run autonomously outdoors without constantly changing 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 a built-in overcharge and undercharge protection device so that the battery is perfectly protected and achieves a high battery life. 

If you want to connect a 3.3V microcontroller like the FireBeetle ESP32 or ESP8266, you have to connect the controller in parallel to the Lipo via the Lipo connection of the microcontrollerboard. The reason is that the ESP32 briefly draws more than 90mA current when sending data.

Features Solar Set DFRobot Micro:

• Constant voltage ratio MPPT algorithm that maximizes solar power conversion
• Designed for 1V to 3V small solar modules
• Ultra low power design
• Charging of 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
  
• Scheme
  
• 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
• Current Output Parallel Lipo: BAT IN 3.7V
• Idle Current: <3 uA
• Protection Functions
• Operating Temperature: -40°C to 85°C
• Dimension: 30.0mm x 30.0mm

Solar Module:

• Rated Voltage (VMP): 2V
• Rated Current (IMP): 160mA
• Open Circuit Voltage (IOC): 2.4V
• Short Circuit Current (ISC): 190mA
• Solar Cell Material: Monocrystalline Silicon
• Other Features: Waterproof, oil-resistant and corrosion-resistant
• Dimension: 50mm x 50mm

Scope of Delivery:

• 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