Allmand Brothers MB 6200 - Manual (Page 11)

11
ARRAY MAINTENANCE (cont)
The array may be tested by using a voltmeter to check the voltage across the array (+) terminal
and array (-) terminal of the sign connector. Expose array to full sunlight. Using a voltmeter, check
open circuit voltage across the leads. The meter should indicate
a voltage reading of 16-20V
DC.
Check all bolts and nuts. Tighten as needed.
BATTERY MAINTENANCE
Check the level of electrolyte in each battery cell. If necessary, add
DISTILLED water to bring the
electrolyte up to the required level. A hydrometer may be used to test the condition of each
individual cell or a voltmeter may be used to test the condition of each individual battery.
Examine all battery terminals for signs of corrosion. If any terminal is corroded, disconnect the
battery cable. Clean the battery terminal and the connector on the cable with appropriate wire
brushes. Reconnect the cable to the battery terminal.
NOTE: Batteries must be recharged periodically using an AC battery charger to avoid over-
sulfating plates and impairment of battery performance.
If
the supplied ALLMAND BATTERY CHARGER is not used, a charge current of at least 50
amps must be provided to sufficiently charge batteries. Use extreme caution when using other
than
ALLMAND charger to observe correct battery polarity and also to avoid over-charging
(“boiling”) of batteries.
CAUTION! Any battery is an infinite current source when the battery terminals are mo-
mentarily shorted which can lead to serious bodily injury or fire. Goggles and other
protective equipment should be worn to shield skin and eyes from battery acid.