a) In the direct current power system, adjust the out-put voltage of the inverter
to protection voltage (e.g. 46V), battery supply the power to the load, then
find out and test the battery which with the lowest voltage, and worst
capacity.
b) Open the inverter and charge the battery, then keep 1hour after full charge.
c) Proceed test at 10hour discharging rate on the worst battery found out in a).
Terminal voltage, temperature, discharging time, and room temperature
should be tested and recorded before and after the test. Take note at the
interval of 1hour. Notes should be taken at any moment when the final
voltage is coming, so that to record the discharging time correctly.
d) Discharging current * discharging time= capacity of the battery group. If the
room temperature is not 25℃, the capacity should be calculated according
to the formula in (A).
e) After finishing the test, charge the battery in a supplementary way so that to
recover it’s capacity.
f) Draw the discharge curve according to the test data.