Lucent Technologies Lineage
®
2000 ECS/GPS Battery Plant J85500G-2
3 - 2 Engineering, Planning and Ordering Issue 6 May 1999
General
engineering
calculations
The using system, also referred to as the load equipment,
determines many characteristics of the power equipment.
Service and maintenance strategies also affect the selection of
power equipment. This section describes, through the following
topics, the types of basic power specifications and how they may
be determined.
• load equipment voltage
• battery voltage
• load drain and growth
• reserve capacity
• charge capacity and recharge time
• battery string balancing
• voltage drop calculations
• conductor sizing
• overcurrent protection
Load Equipment
Voltage
Determine the recommended operating voltage range of the
using equipment. If the battery plant is used to power different
types of equipment, it must meet the requirements of each. Fill
in the load voltage information below. The answers to these
questions will be used in engineering calculations and
equipment selection in the following sections.
1. Recommended operating voltage: ______ volts
2. Minimum steady-state voltage: ______ volts
3. Maximum steady-state voltage: _____ volts
4. Maximum high voltage transient: ______ volts
5. Can the load be damaged by low input voltage? ___ (yes or
no)
If the answer to item (5) is “yes”, low-voltage load disconnect
provisions may be necessary. It is important to distinguish
between low-voltage disconnects for batteries and for loads.
Low-voltage battery disconnect does not protect load equipment
from low input voltage. Load and battery disconnect features are
available on this ECS battery plant.
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