You need to develop your specs first. Think about what you'd want from a systems analyst before starting to design a program. Now apply the same concepts to your hardware project.
You need to determine the total energy (in Watt-hours) that you will need. That will require that you determine how much power (Watts) and for how long (hours). So...you need to know the idle current required (times your specified 4 hours) plus the current when running at load (times your specified 30 minutes). Add those together to get your total Watt-hours.
To specify the battery to use, you need to determine the maximum instantaneous load (in Amperes, as everything for the Pi will want 5 volts). Then you need to match the battery capacity (in Watt-hours) to total energy as determined above. Be sure to allow for an extra 20% for conversion losses and other inefficiencies.
At this point, you're in a position to start considering batteries.
You need to determine the total energy (in Watt-hours) that you will need. That will require that you determine how much power (Watts) and for how long (hours). So...you need to know the idle current required (times your specified 4 hours) plus the current when running at load (times your specified 30 minutes). Add those together to get your total Watt-hours.
To specify the battery to use, you need to determine the maximum instantaneous load (in Amperes, as everything for the Pi will want 5 volts). Then you need to match the battery capacity (in Watt-hours) to total energy as determined above. Be sure to allow for an extra 20% for conversion losses and other inefficiencies.
At this point, you're in a position to start considering batteries.
Statistics: Posted by W. H. Heydt — Mon Apr 15, 2024 10:03 pm