{"id":105,"date":"2018-06-28T22:18:25","date_gmt":"2018-06-28T20:18:25","guid":{"rendered":"https:\/\/www.honey-pi.de\/?p=105"},"modified":"2021-02-16T23:57:17","modified_gmt":"2021-02-16T22:57:17","slug":"autarke-stromversorgung-am-bienenstand","status":"publish","type":"post","link":"https:\/\/honey-pi.de\/en\/autarke-stromversorgung-am-bienenstand\/","title":{"rendered":"Autonomous power supply at the apiary"},"content":{"rendered":"\n

Normally there is no power supply at the apiary, therefore this article is dedicated to the autonomous power supply of the Raspberry Pis (RPi). The Raspberry Pi 3 B needs 5.1V and 3A as optimal input voltage. Compared to other boards like the Arduino or the ESP8266 this is a lot. Nevertheless such a power supply can be realized. With the RPi Zero W<\/strong> only 160mA is consumed. Thus a battery with the Zero W lasts twice as long as with the RPi 3 B.<\/p>\n\n\n\n

If a Surfstick is connected, the power consumption increases additionally (if the transmission of the measurement data takes place via mobile cell radio).<\/p>\n\n\n\n

Battery<\/h3>\n\n\n\n

In my case, I had an old 12V car battery at home. You can also use lead batteries instead of lithium batteries. It is to be paid attention that the battery has as a large “Ah” value as possible. Optimal would be a capacity of at least 70Ah.<\/p>\n\n\n\n

To supply the Raspberry Pi with power a 12 Euro expensive “DC-DC-Buck Converter” is used, which has two USB ports.<\/p>\n\n\n\n

Charging with solar module<\/h3>\n\n\n\n

To charge the battery automatically I have mounted a 25 Watt solar panel on my beehive. This costs between 47 and 58 Euro on Amazon and already includes a 3A charge controller.<\/p>\n\n\n\n