I'm running a battery powered telemetry system which provides data at x (currently 15) minute intervals.
I have a level sensor powered by the telemetry system battery which is energized for 15 seconds per data period.
The sensor has a max current draw of 100 mA.
I'm trying to figure out the number to put in this box to get an accurate Battery Life Estimate.

I appreciate your help.

Link to telemetry system: https://www.signal-fire.com/wp-cont...0099-01-SignalFire-Ranger-Manual-Rev-1_10.pdf
Link to sensor: https://www.ssi-sensors.com/perch/r...al-fluid-trac-220-product-overview-dt-an8.pdf

 

Hi,
Iavr=100mA*(15sec/15min)=100mA*(15sec/900sec)=1.67mA

 

What sort of battery? Some batteries might not last that long.

 

What sort of battery? Some batteries might not last that long.

Lithium

 

Lithium

The BMS will probably discharge it at about 3% per month.

 

Even though the average current is quite low, the battery must be able to handle the peak current bursts, otherwise the battery won’t last.

Many moons ago, in another forum there was an almost identical question to which I provided an identical answer, which the TS chose to ignore and powered his project with coin batteries anyways, with predictable (poor) results.

Hope you don’t make the same mistake.

 

Even though the average current is quite low, the battery must be able to handle the peak current bursts, otherwise the battery won’t last.

Many moons ago, in another forum there was an almost identical question to which I provided an identical answer, which the TS chose to ignore and powered his project with coin batteries anyways, with predictable (poor) results.

Hope you don’t make the same mistake.

It's running a 4 D cell lithium pack.

 

It's running a 4 D cell lithium pack.

Rechargeable?
Are they connected in parallel?
What is their ampere-hour (Ah) rating?

 

Wonderful!
You are safe.
.

 

Rechargeable?
Are they connected in parallel?
What is their ampere-hour (Ah) rating?

Non-rechargeable.
Unknown on the other questions.
This is all the info I have. Avg. Sensor Current supplied by Pyrex.

 

This is all the info I have. Avg. Sensor Current supplied by Pyrex.

That gives a total required battery capacity of 56.6 Ah or 14.2 Ah per cell, witch is well within the 19 Ah I have seen quoted for lithium primary D-cells.

 

UPDATE: After a precipitous fall from the original voltage of 3.67 VDC the battery has now stabilized at 3.53 VDC. I did lower the sensor on-time to 10 seconds as that was enough to get a reading.

Thanks to all for your input.