Autonomously operating sensor nodes need wireless communication as well as an autonomous source of power. This article will introduce you to a battery-powered Internet of Things (IoT) node, buffered by a solar cell, with LoRaWAN connectivity. We focus on the power supply and monitoring the different voltages remotely via Bluetooth and LoRa. But as many different sensor modules are available and there is also good software support, you can adapt the project easily to your specific needs.