QUARTERLY TEST PROCEDURE
The Charger has been programmed to match your battery pack voltage and the batteries specified. To ensure that the charger is working properly and to evaluate the batteries, it is recommended that you perform the following test quarterly.
Step 1 - Take Data during charging
There are three phases in the charging process:
Phase 1 – Bulk Charge
Phase 2 – Absorption
Phase 3 - Equalization
Take the data at approximately 30 minutes intervals. Here’s an example:
Time Indicating Light Voltage
(hrs) (R, Y, G) (Volts)
2:00PM Start 142
2:30 R 151
3:00 R 154
7:10 Y 175
7:33 G 179
Step 2 – Evaluate the Voltages
a. Was the voltage increasing during Phase 1- Constant Current?
b. Was the voltage constant during Phase 2 – Yellow light?
c. Was the voltage increasing during Phase 3 – Green light?
Step 3 – Evaluate the Time
The charger is rated at X watts. If it is a dual voltage charger (115/ 230VAC) charger, the 115VAC is limited to 1600 watts. That is the power available from the outlet. Battery packs weighing more than 1000 lbs are best charged by the 230VAC; the 115VAC is an opportunity charger.
The Kw-hrs in your battery pack can be calculated based on the 75 minute rating. For example, T-125 is rated at 125 minutes at 75 amps. So a 144V battery pack has:
Battery Power = 75 amps x 144V x 125 min/ (60 min/hr) = 22500 watt-hrs= 22.5 KW-hr
If you have a 3KW-hr charger, then it will take 7+ hrs for the Bulk Phase and an additional 1-3 hrs for the absorption and equalization.