Uninterruptible Power System 800 Guía de instalación descargar pdf (Pagina 19)

PROPERTY OF SOLIDSTATE CONTROLS, INC. 7/1998

Since battery operation results from a chemical reaction, temperature plays a significant role in

performance and life. A standard temperature of 77°F (25°C) is used to rate the batteries. It is

recommended that the battery room temperature be maintained as close as possible to this

temperature (72-80°F would be acceptable).

Care should be taken not to locate batteries where they will be in direct sunlight or near a register which

might subject one or more cells to high or low temperatures. The temperature differential between all cells

in a battery bank should no be more than 5°F. Although battery capacity improves considerably at higher

discharge rates as the temperature increases, there is also a significant decrease in battery life. An

increase in periodic maintenance, especially watering, can also be expected with stationary types.

Sealed batteries are less tolerant of high temperatures than are wet batteries. If average daily

temperatures in the battery room exceed 92°F, you would be advised to consider using only wet

stationary battery type.

When batteries are operated at temperatures below the standard of 77°F, the available capacity

and consequently, the back-up time is reduced. It is significant to note that the percentage

decrease in operating time will be greater than the percent loss of capacity and varies with the rate

of discharge. The effect is greater at high discharge rates, such as fifteen minutes, then at lower

discharge rates, such as eight hours. Also, since the charging voltage was based on 77°F, reduced

temperatures will result in increased recharge time, a likelihood of cell imbalance and

consequently, a need for equalization.

1. Floor Space Required

Various styles and sizes of battery racks are available. The selection of racks will probably be

based on available floor space. The two-tier and two-step racks will provide for easier servicing

of the battery; however, the three-tier and three-step racks will save floor space. For sealed

batteries, cabinets offer the most efficient use of floor space.

Battery banks are heavy, and consequently, floor loading may be a critical consideration. Be

sure the floor will be adequate. Floor loading over 600 pounds/square foot can be expected

with some battery bank and rack combinations. Obtain floor loading requirements for the

proposed location. Floor loading requirements may also help determine the type of racks

which can be used in a particular location.

Standard two-tier racks are the most economical and most commonly used models in commercial

and industrial applications. They do not include any side or end rails to restrain the battery cells. Your

building code may require shock-protecting racks for Zone 1 area applications, or seismic racks for

Zones 2, 3, or 4 applications. If these racks are required, SCI can quote prices and supply

dimensions. These racks are generally not available in space-saving three-tier or three-step designs.

Most sealed batteries in cabinets are suited for UPC Zone 4 applications. Since stationary batteries

do require some routine maintenance, adequate space must be allowed around the battery bank to

accommodate safe and efficient maintenance. The cells need to be visible in order to check

electrolyte levels and be accessible when specific gravity and cell voltage checks are required.

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Uninterruptible Power System 800 Guía de instalación Pagina 19