Alpha Technologies AlphaCell OPzS - Manual (Page 32)

OPzS-BATTERY 32
13.0 Test Procedures
13.1 Procedure for Battery Capacity Tests
At least 3 days but not more than 7 days before a battery capacity test, give the battery an
equalizing charge as described in Section 11.3.
Make sure all battery connections are clean, tight, and free of corrosion.
While the battery is on fl oat, read and record the specifi c gravity and voltage of each cell,
the temperature of at least every 6th cell, and battery terminal fl oat voltage.
Disconnect the battery charger and any other load on the battery to be tested.
Select the discharge rate based upon requirements (Reference to EN 60896-1, IEC
60896-1 or IEEE 450).
With the variable load bank having an ammeter in series and a voltmeter across the
battery terminals, connect the load, simultaneously starting the timing device. Maintain
the correct current while periodically reading and recording total battery voltage. When
the minimum total voltage has been reached, it is desirable to read and record each cell
voltage including an intercell connector.
Observe the battery for intercell connector heating.
Calculate the capacity using the following formula:
% Capacity at 25°C = Ta/Ts x 100
Ta = test discharge time to specifi ed voltage.
Ts = rated discharge time to specifi ed voltage.
Recharge the battery, preferably using an equalizing charge (Section 11.3) to minimize
the recharge time.
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