Hi,
Please can someone help me with calculating how much battery capacity I need. Calculating different ways which all seem logical in some respects, I can get very different answers! What I have is:
- A datalogger which takes a sample 3 times a minute.
- The sample time is ~1sec and draws 2mA.
- When it is not sampling it draws 2uA.
- I need the battery to last for a year. I have done:
1 second x 3 = samples per minute at 2mA. = 3
3 x 60 = 180
180 x 24 = 4320 (amount of 2mA current draw per day in seconds)
4320 x 365 = 1576800 seconds
1576800 / 60 = 26280 minutes at 2mA per year
26280 / 60 = 438 hours at 2mA per year
438 hours x 0.002 = 0.876Ah
8760 hours per year - 438 = 8322 hours at rest current
8322 x 0.000006 = 0.016644 Ah requirement
Total requirement = 0.016644 + 0.876 = 0.892644 Ah.
Please can anyone confirm if I have done this correctly?
Thanks,
Please can someone help me with calculating how much battery capacity I need. Calculating different ways which all seem logical in some respects, I can get very different answers! What I have is:
- A datalogger which takes a sample 3 times a minute.
- The sample time is ~1sec and draws 2mA.
- When it is not sampling it draws 2uA.
- I need the battery to last for a year. I have done:
1 second x 3 = samples per minute at 2mA. = 3
3 x 60 = 180
180 x 24 = 4320 (amount of 2mA current draw per day in seconds)
4320 x 365 = 1576800 seconds
1576800 / 60 = 26280 minutes at 2mA per year
26280 / 60 = 438 hours at 2mA per year
438 hours x 0.002 = 0.876Ah
8760 hours per year - 438 = 8322 hours at rest current
8322 x 0.000006 = 0.016644 Ah requirement
Total requirement = 0.016644 + 0.876 = 0.892644 Ah.
Please can anyone confirm if I have done this correctly?
Thanks,