OutBack Power EnergyCell 1100RE, Installation Manual And Owner'S Manual

Page: 63 / 70

24
www.enersys.com
Publication No. US-VR-OM-002
March 2008
11.2 TEST PROCEDURES
11.2.1 Procedure for Battery Capacity Tests
Use the following test procedure or use the test procedure described in IEEE std. 1188.
An equalizing charge, as described in Section 8.3, must have been given within the last 7
days. (Battery should be returned to float for 7 days before the test.)
1. Make sure all battery connections are clean, tight and free of corrosion.
2. While the battery is on float read and record voltage of each cell, temperature of at
least every tenth cell and battery terminal float voltage.
3. Disconnect the battery charger.
4. Select the discharge rate based upon the critical load and time period. The test
discharge current is equal to the rated discharge current divided by
the K Factor (see Table 11.1) for the initial battery temperature.
5. 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.
6. Observe the battery for intercell connector heating.
7. Calculate the capacity using the following formula:
% Capacity at 77˚F (25˚C) =
Where Ta = test discharge time to specified voltage.
Where Ts = rated discharge time to specified voltage.
8. Recharge the battery, preferably using an equalizing charge (Section 8.3) to
minimize the recharge time.
Ta x 100
Ts