PowerFilm Solar Inc

Solar Development Kit (DEV-BASIC)

Solar Development Kit (DEV-BASIC)
Where To Buy

The DEV-BASIC is a complete energy harvesting power management solution using TI BQ25570 PMIC. It is able to efficiently extract energy from solar whether in a dim indoor environment or outdoors

in direct sunlight. 


Once collected, the BQ25570 can store energy in a variety of storage elements while providing a regulated voltage output to power your application devices.


The kit includes everything you need to start developing power autonomous electronics. Use Indoor Light series panels for indoor applications and use Classic Application panels for outdoor environments. Pre-configured to charge 3.7V Lithium batteries, you can use the included Li-Po battery or swap in a more suitable size.


Kit Contents

  • DEV-BASIC circuit board assembly

  • (2) LL200-3-37 Indoor Solar Panel with 6” leads

  • (2) ONP1.2-12x24 Classic Application Solar Panel with 6” leads

  • 60mAh rechargeable Li-Polymer battery

  • Instructions, hardware and software files, and product documentation


Panel Specifications

Indoor Series          


1000 lux:

  • 1.089mW

  • 0.419mA

  • 2.6V

200 lux:

  • 0.166mW

  • 0.079mA

  • 2.1V

Classic Application


100% Sun

  • 4mW

  • 3.33mA

  • 1.2V

25% Sun

  • 0.9mW

  • 0.7mA

  • 1.2V


System Diagram

Indoor Solar Development Kit layout

Board Layout

solar development kit board layout


Use Cases - Power Source For

Wireless connectivity is now standard in modern electronics and the growing IoT and sensing industries. Many applications in this area are very low power and can run completely off a solar energy harvesting solution.

  • BLE Beacons and Tags

  • Smart Windows and Shades

  • E-Paper Displays

  • Wireless Sensors

  • Telematics

  • Wearables

  • Smart Locks

  • Field and Herd Monitoring

  • Thermostats

  • Other Low Power Electronics



  • Nano power DC-DC boost charger, with 100mV minimum input voltage.

  • Integrated power management.

  • Compatible with Li-ion, LiFePo, Thin-Film, capacitor, and supercapacitor rechargeable battery technologies.

  • Adjustable battery under-voltage protection and load disconnect with hysteresis. 

  • Adjustable battery overvoltage protection.

  • Regulated power output with adjustable voltage.


Capacitor / Super Capacitor Storage Element Operation

The DEV-BASIC is capable of running and operating with a capacitor as the storage element instead of the Li-Polymer battery. The capacitor will maintain steady power to the system while light is available.


Charge and discharge rate will be greatly affected by the size of the capacitor. If the capacitor is completely discharged (0V) the charge rate will be slower because the harvester chip is not yet fully functional.


Board Configuration and Customization

The Solar Development Kit hardware is currently configured to charge a Li-Polymer type battery with max voltage of 4.2V and the output voltage set to 3.0V. The configuration can be customized by modifying SMT resistor dividers per the BQ25570 datasheet specifications which can be found under the “Additional Resources” section below.


Resistors OV1(2), OK1(2)(3), and OUT1(2) control the output voltage, charge configuration, and power management of the BQ25570 PMIC. Use the formulas below to determine appropriate 0603 package resistor values for your desired application.


Output Voltage: VOUT = 1.21 * (R_OUT2 + R_OUT1)/R_OUT1

Charge Termination Voltage: VBAT_OV = 1.815 * (1 + R_OV2/R_OV1)

Low Voltage Load Disconnect: VBAT_MIN = 1.21 * (1 + R_OK2/R_OK1)

Load Re-connect Hysteresis: VBAT_MIN_HYST = 1.21 * (1 + (R_OK2+R_OK3)/R_OK1)


For best results the sum of each resistor divider should be as close too but not exceeding 13Mohms. VOUT cannot exceed VBAT, VBAT_OV cannot exceed 5.5V, and VBAT_MIN cannot be less than 2V.


IV Curves


Indoor Series

LL200-3-37 IV Curve


Classic Application

ONP1.2-12x24 IV Curve


*No international shipments for online purchases. For delivery to other locations, please order via Digi-Key or Mouser.

Where To Buy

United States

Ships Internationally

Solar Development Kit (DEV-BASIC) at Mouser Electronics


Solar Development Kit Spec Sheet

Solar Development Kit Customization Guide

IC (BQ25570) Data Sheet


Download DEV-BASIC Software & Resources Below

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