OPzV Battery Operation Manual
8
The certain voltage can be equalizing voltage or floating voltage. When the discharge depth is
large (such as larger than 10% C
10
), equalizing voltage is recommended, which will make charging
more sufficient. We can also determine the voltage according to initial current. When current is
large than 0.05C
10
A (the reference current when transfer to equalizing charge), we recommend
equalizing charge. the time of charge is 24 hours. Or the value of charge current is not varied for
continuous three hours under the condition of constant voltage, we can determine the charge is
finished.
We can raise charge current if batteries need to be fully charged in a short time, but the
current cannot be higher than 0.25C
10
A.
4.3 Battery Recharging Method
This method is used for battery charging for the first time after installing or battery recharging
after long time storage.
Recharging Parameter
We use equalizing charge to recharge the batteries, the parameter is as below:
1
Charging mode: equalizing charge;
Charging voltage: 2.35V/cell, for -48V system, charging voltage is 56.4V;
Charging voltage (made up with 2V cell) = 2.35 × 1× battery quantity
2
Current limited: 0.10C
10
(A);
3
Cut-off condition: the charging current is less than 0.005C10 with another extended 3
hours or charging time reached 16 hours;
Recharging Procedure
1
Connect the batteries in series with cables or copper bars, and make sure that all the
screws tightened with each joint, then connect the positive of battery group to the positive of
charging equipment (charger), and the negative of battery group to the negative of charger. Pay
attention, a breaker or fuse should be connected in the circuit in order to protect the batteries and
charger, the capacity of breaker or fuse should be 1.5 times of circuit maximum current.
2
Turn on the charger, set the charging voltage and current according to 3.1 Recharging
Parameter.
3
Turn on the breaker or fuse, and then turn on the charger to recharging batteries.
4
Stop charging when reaching the cut-off condition. At the last one hour before finishing,
test the battery voltage one by one, the battery which voltage is below 2.16V/cell should be dealt
with the method in chapter 3.3, if that battery still can not accord with the requirement, it should be
rejected.
Cycle Procedure
We can use the method as below to recharge the batteries after long time storage (for
example: more than 1 year):
First connect the batteries in series to the charger, discharge batteries with constant
current 0.25C
10
(A) for about 3 hours. Then use the method in chapter 3.2 to charge the
batteries. Stop charging when reach the cut-off condition
If the capacity still can not be renewed by this method, this means the batteries fail
because of long time storage or other reasons.
