Author Topic: Avg. Power consumption calculation  (Read 930 times)

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Offline ArCoNTopic starter

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Avg. Power consumption calculation
« on: February 04, 2019, 10:43:54 am »
Hi All  8)

Can any one help me with this.

I have a circuit that use:
30uA static
wake up 2 times/sec and uses 3.3mA for 10mS at idle
and it do some work 10 times/day and it uses 5mA for 5sec

i cant get it right, for some reason

i have a 1100mAh battery

I get around 100h in my calc and it is not right  :-\

Thanks

 
 

Offline Psi

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Re: Avg. Power consumption calculation
« Reply #1 on: February 04, 2019, 11:03:06 am »
I got average total current draw of  98.894 uA

so 11123 hours
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Offline ArCoNTopic starter

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Re: Avg. Power consumption calculation
« Reply #2 on: February 04, 2019, 11:05:12 am »
Thanks Psi

Can you write how you did it?  ;D
 

Offline sleemanj

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Re: Avg. Power consumption calculation
« Reply #3 on: February 04, 2019, 11:09:09 am »
5mA for 5s is 0.0069 mAh, 10 times a day, divide by 24 hours 0.00289 mAh in an hour

3.3mA for 10mS is 9.1666666666667e-09 mAh, twice a second for an hour is 0.066 mAh in an hour

30uA for an hour is 0.03 mAh

Total 0.0988 mAh in an hour

I come up then with 11,000 hours (rounded :-))

I am probably wrong, I'm really bad at maths.
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Offline Psi

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Re: Avg. Power consumption calculation
« Reply #4 on: February 04, 2019, 11:14:29 am »
Here's the workings, excel file attached.

But i wouldn't trust this as correct unless someone else gets the same number.
(Edit, looks like sleemanj also got 0.0988 mAh  and round 11,000 hours )

« Last Edit: February 04, 2019, 11:24:28 am by Psi »
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline ArCoNTopic starter

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Re: Avg. Power consumption calculation
« Reply #5 on: February 04, 2019, 11:27:52 am »
Thanks a lot  ;D
 

Offline Psi

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Re: Avg. Power consumption calculation
« Reply #6 on: February 04, 2019, 11:34:06 am »
No problem  :)
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