Quick Answer
Yes, it's possible to monitor battery state without internet access using local monitoring systems and techniques such as voltage monitoring, current sensing, and remote monitoring via radio frequency or cellular networks.
Local Monitoring Options
Local monitoring systems can be implemented using voltage monitoring, current sensing, and temperature sensors. These systems can be connected to a controller or a microcontroller to read the sensor data and provide an indication of the battery state of charge. For example, a simple voltage monitoring system can be implemented using a voltage divider and an analog-to-digital converter (ADC) to read the battery voltage and calculate the state of charge.
Radio Frequency (RF) Monitoring
Radio frequency (RF) monitoring is another option for monitoring battery state without internet access. RF systems use a transmitter to send data from the monitoring system to a receiver, which can be connected to a display or a controller. RF systems can be used to monitor battery voltage, current, and temperature, as well as other parameters such as charge and discharge cycles, and battery health. For example, a popular RF monitoring system uses a 868 MHz frequency band to transmit data up to 1 km away.
Cellular Network Monitoring
Cellular network monitoring is another option for monitoring battery state without internet access. Cellular systems use a cellular module to send data to a remote server or a display using a cellular network such as 2G, 3G, or 4G. Cellular systems can be used to monitor battery voltage, current, and temperature, as well as other parameters such as charge and discharge cycles, and battery health. For example, a popular cellular monitoring system uses a 2G or 3G module to send data every 5 minutes, with a range of up to 20 km.
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