The implementation of tens of thousands of small satellites in low Earth orbit will allow regular, reliable communication with Earth-based sensors in remote locations throughout Australia. However, one remaining challenge with remote sensors is how to maintain battery power for many years, without introducing a recharging burden. LoRaWAN has gained significant attention for internet of things applications due to its low power consumption and long range potential for data transmission. It has been confirmed as a viable technology for Earth-to-satellite transmission. While there is a significant body of work assessing LoRA coverage and data transmission characteristics, there is a lack of data available about commercially available LoRa prototyping boards and their power consumption, in relation to their features. It is currently difficult to estimate the power consumption of a LoRa module operating under different transmission profiles. In this study, power testing has been carried out on physical hardware and significant variation was found in the power consumption of competing boards, all marketed as “extremely low power”. Test results are presented alongside an experimentally-derived power model for the lowest power LoRa module, and power requirements are compared to firmware settings. The power analysis adds to existing work showing trends in data-rate and transmission power settings effects on electrical power consumption. The model’s accuracy is experimentally verified and shows acceptable agreement to estimated values. Finally, an application of the model is presented by way of a hypothetical Earth-to-satellite remote sensing scenario and calculations are performed in order to estimate battery life.