Murphy BCEG-24-20 - Manual (Page 15)

Section 75 00-02-0615
02-29-08 - 11 -
Measuring Charging Voltage and Current
To check the charger is working, follow these steps then consult the expected conditions listed
below.
1. VOLTAGE – Place voltmeter across battery terminals (“V” in diagram).
2. CURRENT – Turn off AC power supply before breaking into the line to measure DC
Amps. Break the positive line to the battery and place an ammeter between positive
from charger and positive of battery (“A” in diagram).
Current Flow from Charger to Battery
If voltage at terminals is less than nominal battery voltage then the maximum rated charger
current should be present.
NOTE: Once battery is fully charged, output current should be between 0.1%
and 0.5% of batteries AH capacity plus any standing loads.
Voltage Rise at Battery Terminals
A gradual rise of voltage should be seen showing as float voltage is reached – batteries should
not be boost charged continuously.
NOTE: If the battery voltage increases rapidly during charge and no minimum
current is measured then the battery may have become sulphated and will not
hold charge and may be unrecoverable.
Output Voltage
12/v 24/v
Float: 13.6V 24.2
LEAD
ACID
Boost: 14.1 28.2V
Typical output with no battery or load
connected. For all Guardian models the
precalibrated float voltage should be present.