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#Deal: 5V Solar Powerbank up to 30000mAh for Arduino, ESP8266, ESP32, Raspberry Pi projects

#Deal: 5V Solar Powerbank up to 30000mAh for Arduino, ESP8266, ESP32, Raspberry Pi projects

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$3.27

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Set Alert for Product: 20000mAh 6LED Waterproof Solar Power Bank Dual Portable External Battery Charger - $3.27
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Price history for 20000mAh 6LED Waterproof Solar Power Bank Dual Portable External Battery Charger
Latest updates:
  • $3.27 - 14 January 2019
  • $3.48 - 10 January 2019
  • $8.70 - 9 January 2019
  • $3.48 - 8 January 2019
  • $3.27 - 4 January 2019
  • $3.37 - 3 January 2019
  • $3.59 - 28 December 2018
  • $12.49 - 27 December 2018
Since: 20 July 2018
  • Highest Price: $35.99 - 13 November 2018
  • Lowest Price: $3.27 - 4 January 2019
Last Amazon price update was: 13 April 2018 12 h 05 min
× Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com (Amazon.in, Amazon.co.uk, Amazon.de, etc) at the time of purchase will apply to the purchase of this product.

The ESP8266 is ideal for making connected objects that run on battery power. In sleep mode, the power consumption does not exceed 20 μA (on the new models ESP-WROOM-02 / ESP8266EX at least). It is possible to manufacture its own solar power circuit but there is an even more practical solution, the solar Powerbank. Place the Powerbank in a brightly lit place, ideally in direct sunlight to ensure a full charge during the day.

Some tips to save battery and ensure a continuous operation of your objects:

  • Turn on Deep Sleep mode in your ESP8266 and ESP32 programs. The power consumption will be limited to 20 μA.
  • Limit the sending of data to a minimum. Use optimized technology for fast, lightweight data transfer. For example MQTT or the Websocket
  • Limit the frequency of sending data to a server (local or remote). The WiFi connection is very greedy in energy.
  • Optimize your code by limiting energy consuming calculations.
  • Use the interrupts to wake up the module when an actuator is pressed (bell button,
  • Use energy-saving sensors. Do not use a physico-chemical sensor of the MQx series (for example the MQ2 or MQ135). They must be hot (permanently) so that pollutant measurement is possible. Instead, use self-calibrating sensors such as the MH-Z19 to measure CO2 content.
  • If your project uses energy-consuming actuators (servomotor, Nema motor …), opt for a very big Powerbank (at least 20000mAh)
  • The performance of the batteries decreases when the temperature drops (even more below 0°C), isolate the Powerbank to protect the battery.
  • Below 0°C, electrolytes (contained in capacitors for example) can freeze. Your projects may not work properly. It is not necessarily the Powerbank that is unloaded.

Read this tutorial to learn how to measure battery voltage using an Arduino or ESP8266.

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