13
8. BATTERY INFORMATION
The standard batteries supplied in the MESTA UPS are sealed lead-acid maintenance-free 12 volt 6.5
amp-hour batteries. These batteries are wired in series to provide a total nominal voltage as follows:
Number of Batteries:
4
8
Total Nominal Voltage:
48VDC
96VDC
The nominal voltage found in the larger models is 96 volts DC. Expected battery float life is 5 years at
room temperature (70
°
F), although frequent discharges and high ambient temperatures will shorten
battery life. The standard battery supplied is designed to be kept at a constant 13.5 to 13.8 volts.
The microprocessor is set to charge the batteries to 13.7 volts. It will recharge the fully discharged
batteries in a relatively few hours. The run time that one can expect is dependent on the magnitude
of the load and the age and state of charge of the batteries.
I
I
WARNING
A BATTERY CAN PRESENT A RISK OF ELECTRICAL SHOCK OR BURN FROM HIGH
SHORT CIRCUIT CURRENT. OBSERVE PROPER PRECAUTIONS. WHEN REPLACING
BATTERIES, USE THE SAME NUMBER AND THE FOLLOWING TYPE BATTERIES: SEALED
LEAD ACID. PROPER DISPOSAL OF BATTERIES IS REQUIRED. REFER TO YOUR LOCAL
CODES FOR DISPOSAL REQUIREMENTS. Do not dispose of batteries in a fire - they may
explode. Do not open or mutilate any battery. Released electrolyte is harmful to the skin and
eyes. It may be toxic. Only qualified technicians or supervised personnel should remove and/or
replace the batteries. Mistakes in connecting or disconnecting can cause connections to arc or
weld and could result in severe bodily harm or damage to the UPS.
I
I
ATTENTION
UNE BATTERIE PEUT PRÉSENTER UN RISQUE DE CHOC ÉLECTRIQUE OU DE BRÛLURE
PAR TRANSFERT D'ÉNERGIE. SUIVRE LED PRÉCAUTIONS QUI S'IMPOSENT. POUR LE
REMPLACEMENT, UTILISER LE MÊME NOMBRE DE BATTERIES DU MODÉLE SUIVANT:
SEALED LEAD ACID. L'ÉLIMINATION DES BATTERIES EST RÈGLEMENTÉE. CONSULTER
LES CODES LOCAUX À CET EFFET.
Instruction for Removing UPS Batteries:
Mesta has designed this unit to provide maximum battery reliability, thus requiring little or no
maintenance. However, should a battery problem be detected, please adhere to the following
instructions and preceding warnings. The unit has been designed to allow easy access and
replacement of the batteries by qualified technicians or supervised personnel.
Removing the batteries necessitates opening the UPS cabinet. Follow the procedure for opening the
UPS outlined in the "
Internal Maintenance
" section of this manual. The following precautions should
be observed while working on batteries:
1) Remove watches, rings, or other metal objects.
2) Use tools with insulated handles.
3) Do not lay tools or metal parts on top of batteries.
4) Do not touch battery terminals to chassis (watch for inadvertent contact that can occur if not
being careful when removing lead wires to battery terminals).
5) Make sure battery fuse located external to the UPS, on its upper back side, has been
removed.