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re-do emonthv2 battery life estimate, batteris are in series :-)

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Glyn Hudson 2016-10-04 02:37:32 +01:00
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docs/power_consumption.md
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@ -37,19 +37,19 @@ To summarise:
- Off current = 0.06mA
- Off time = 59774.5 ms
[Oregon Embedded online battery life calculator tool](http://oregonembedded.com/batterycalc.htm) can now be used to calculate battery live. Assuming using 2 x AA alkaline batteries @ 2700 mAhr each = 5400
[Oregon Embedded online battery life calculator tool](http://oregonembedded.com/batterycalc.htm) can now be used to calculate battery live. Assuming using 2 x AA alkaline batteries in series = 2700 mAhr
![emonth V2 estimated battery life](emonth2_batterylife_estimate.png)
Given the measured power consumption the emonTh2 is estimated to have a battery life of 7.6 years!
**Given the measured power consumption the emonTh V2 is estimated to have a battery life of 3.8 years**
Plugging in the [power consumption figures from the emonTh V1](http://blog.openenergymonitor.org/2013/10/emonth-update-software-power/) (with DHT22) into the calculator a 1.4 year battery life is estimated.
Plugging in the [power consumption figures from the old **emonTh V1**](http://blog.openenergymonitor.org/2013/10/emonth-update-software-power/) (with DHT22) into the calculator a 1.4 year battery life is estimated.
![emonth V1 estimated battery life](emonth_V1_estimated_batterylife.png)
From [real world testing](http://blog.openenergymonitor.org/2015/02/real-world-emonth-battery-life) is been established that the emonTh V1 actually achieves a 8 month battery life. This is 57% less than the estimated figure.
Assuming the battery life calculator is overestimating by the same amount for the emonTH V2 we can **expect a real world battery life of just over 5 years**, which is not too bad :-p
According to the calculator the emonTH V1 is estimated battery life of 0.7 years which matches the [real world emonth v1 battery life](http://blog.openenergymonitor.org/2015/02/real-world-emonth-battery-life).
I have setup a battery life test with the emonTh V2 with Si7021 sensor, I will report back in a couple of years :-)
[Forum thread discussion](https://community.openenergymonitor.org/t/emonth-v2/1696/2)