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3.4 Battery Installation
WARNING
Only qualified personnel should install or service batteries.
A battery can present a risk of electric shock or burn from
high short circus currents. Eye protection should be worn to
prevent injury from accidental electrical arcs.
Remove rings, watches and all metal objects.
Only use tools with insulated handles.
Wear rubber gloves.
It a battery leaks electrolyte, or is otherwise physically
damaged, it must be replaced and stored in a container
resistant to sulfuric acid and disposed of in accordance with
local regulations.
If electrolyte comes into contact with the skin the affected
area should be washed immediately.
Batteries must be disposed of according to local
environmental laws
Due to the IGBT inverter design the DC bus bar voltage level is
dependent on the system output AC voltage. Therefore, the number
of battery blocks required will differ according to the system
requirements, as shown below:
380V AC system requires 432 v DC busbar =192 battery cells.
400V AC system requires 446 v DC busbar =198 battery cells.
415V AC system requires 459 v DC busbar =204 battery cells.
The batteries associated with the UPS equipment are usually
contained in a purpose-built battery cabinet, which sits alongside the
main UPS equipment. Sealed, maintenance-free batteries are
normally used in this type of installation (see figure 4-8).
Where battery racks are used, they should be sited and assembled in
accordance with the battery manufacturer's recommendations. In
general, batteries require a well-ventilated, clean and dry environment
at reasonable temperatures to obtain efficient battery operation.
Battery manufacturers' literature provides detailed safety measures to
be observed when employing large battery banks and these should be
studied and the proposed battery installation checked to verify
compliance with the appropriate recommendations.
In general, a minimum space of 10 mm must be left on all vertical
sides of the battery block. A minimum clearance of 20 mm should be
allowed between the call surface and any walls. A clearance of 150
mm should be allowed between the top of the cells and the underside
of the shelf above (this is necessary to for monitoring and servicing the
cells). All metal racks and cabinets must be earthed. All live cell
connections must be shrouded.
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