Outback EnergyCell RE High Capacity Manual

Publication No. US-VR-OM-002
March 2008
www
.enersys
.com
17
8.0 OPERATION
8.1 General
The sealed design of the VRLA batteries makes it impossible to measure specific gravity as a
state-of-charge indicator. The state-of-charge can be identified to some degree by the
amount of charging current going to the battery exceeding 2.35 volts per cell.
8.1.1 Determining the State-of-Charge
The following method can be used to determine the state-of-charge of the battery.
1. Place the battery on charge/recharge following a discharge.
Read the ammeter.
The char
ging current will be a combination of the load cur
rent plus the current
necessary to charge the battery.
2. The batter
y becomes fully char
ged when the current to the batter
y starts to
decrease and stabilize.
3. When the cur
rent level remains constant for thr
ee consecutive hours, the state-of-
charge is approximately 95 to 98%. Full charge can be assumed.
For most r
equirements, the battery is ready for use.
Optional catalyst vents may be used on mSeries and DDM cells.
A White paper discussion about the use of catalyst vents can be
found on the EnerSys
®
website at www
.enersys.com.
NOTE