Author: Mohamed Ben Tato
Date: 20/07/2020 Machine nr: V2.01
The purpose of this test is to measure the time the machine can work on battery power.
In the current prototype, no separate battery charger is used to charge the batteries. This experiment was done to check whether or not the batteries are charged enough by the PSU voltage without a proper charger.
According to the specifications listed by the MHRA, at least 20 minutes of battery lifetime should be achieved.
The machine uses two RS® PRO 12 V 2.3 AH batteries (see picture 1) .
The settings of the machine used in the setup: RR= 35 BPM, PP= 30 cmH20 and I/E = 1:2.0 . The fan is continuously on at 100%.
Once the batteries are empty and the machine has stopped working, the machine is plugged in to charge the batteries overnight and the test is repeated the next day.
This test was repeated twice.
Measurements and conclusion
After 3 charge and discharge cycles the two RS® PRO 12 V 2.3 AH batteries support the Breathney machine on average for 2,5 hours.
This is well beyond the required 20 minutes goal.
It can be concluded no changes or additions are needed to the battery and charging system.