DFRobot Micro 3.3V Solar Set

This DFRobot set consists of the Solar Power Manager Micro with the SPV1050 and a monocrystalline 2 V / 160 mA solar panel. The module charges a 3.7 V lithium battery with MPPT via solar or USB and delivers a regulated 3.3 V at 90 mA, for low-power IoT sensors and 3.3 V microcontrollers such as FireBeetle ESP32 or ESP8266. MPPT draws as much energy as possible from small solar cells even in weak light. Protection against overcharging and deep discharge preserves the battery. The battery is not included.

Connect a 3.3 V microcontroller such as FireBeetle ESP32 or ESP8266 in parallel to the battery via the battery connector of the microcontroller board, not to the 3.3 V output. The reason: the ESP32 briefly needs more than 90 mA when transmitting.

Recommended Accessories:

• FireBeetle Board ESP32-E

Features:

• MPPT with constant voltage ratio for as much solar power as possible
• Designed for small solar panels with 1 V to 3 V
• Very low self-consumption
• Charging a 3.7 V lithium battery via solar or USB
• Protection at the battery input against overcharging, deep discharge and reverse polarity
• Output with short-circuit and overcurrent protection

Application Examples:

• Solar-powered IoT sensors outdoors
• Weather stations with FireBeetle
• Long-term measurements without battery changes

Documentation:

• DFRobot Wiki
• Layout drawing (PDF)
• Schematic (PDF)
• SPV1050 datasheet (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: DFR0579
• Charge controller IC: SPV1050
• Solar input (SOLAR IN): 0.5 V to 4 V
• Battery input (BAT IN): 3.7 V lithium battery
• Maximum charging current via USB IN: 100 mA
• Maximum charging current via SOLAR IN: 70 mA
• Overcharge protection: 4.2 V
• Deep discharge protection: 3.1 V
• Regulated output: 3.3 V, 90 mA
• Output parallel to the battery: BAT IN 3.7 V
• Quiescent current: below 3 µA
• Operating temperature: -40 °C to 85 °C
• Charge controller dimensions: 30 × 30 mm
• Solar panel rated voltage (VMP): 2 V
• Solar panel rated current (IMP): 160 mA
• Solar panel open-circuit voltage (VOC): 2.4 V
• Solar panel short-circuit current (ISC): 190 mA
• Solar panel material: monocrystalline silicon, waterproof, oil-resistant and corrosion-resistant
• Solar panel dimensions: 50 × 50 mm

Scope of Delivery:

• 1× Solar Power Manager Micro 3.3 V
• 1× monocrystalline solar panel 2 V 160 mA
• 2× red wire 15 cm 24AWG
• 2× black wire 15 cm 24AWG
• 1× power cable with PH2.0-2P plug 15 cm
• 2× pin header 1×2 pin