I paired the Aeotec Multisensor battery powered. I wake up the device every 1800s=30min to update the measurements. The installation place is such that I can’t get the USB powerplug nearby.
My calculations for battery capacity is as follows:
According to manual:
- If the MS6 is triggered 20 times per a day, using 2 batteries, the MS6 will last 1.5 years on battery life
- If the MS6 is triggered 200 times per a day using 2 batteries, the MS6 will last around 2-3 months.
Two batterie capacity is 3000mAh at 3,0V = 9Wh.
One triggering should use about 9Wh/(20trigger x 365d/a x 1,5a)=0,822mWh/trigger.
I’m triggering the device 48 times per day, and use the room about 1h a day so during that time the device triggers about every 20s. So total of 48trigger+1h x 60min/h x 60s/min x 1trigger/20s=228triggers/d.
So I’m using 228triggers/d x 0,822mWh/trigger=188mWh/d, so double battery should deplete in 9000mWh/188mWh/d=48days. That’s really fast. I hate using batteries.
So I thought that why not use a USB battery pack with higher capacity. I had a battery pack with 37Wh capacity. My calculations were:
37000mWh/188mWh/d=197days. Okay some power will be lost in the battery pack convert from 3,somevolt to 5V USB. Let’s say 10% is lost which is alot, so the battery will last for 177days. That’s nice, let’s go for it.
I tested it with one full USB battery pack charge. It took 7 days to deplete the battery pack
I think most of the energy will be used inside the battery pack electronics, but other than that I have no idea where the energy is drained. Can someone elaborate how this is possible?
I will test it again. Let’s see if it is consistent.