C&D Technologies RS-2044 msEndurII Series - Manual (Page 27)

RS02044/1114/CD 27 www.cdtechno.com
Part 10 – Battery Degradation
10.1 General Information and Precautions
When properly maintained and charged, the ATP and ATLP series of msEndur II batteries should
provide many years of trouble-free service. However, despite their inherent dependability, failure to
operate and maintain them correctly can lead to damage, shortened service life and possible loss of
service. The following sections address some of the most frequently encountered errors.
10.2 Float Versus Cycle Life
Standby batteries such as the msEndur II are designed and constructed to provide long life in continuous
float service. They differ in their design from cycling batteries, such as engine starting, solar or traction
types. Standby batteries are continuously charged at a comparatively low float voltage in parallel with the
load, ready to supply instantaneous DC power either directly to the load or by way of interfacing
electronics, such as an uninterruptible power supply (UPS) system. The name “stationary” implies the
battery is usually permanently placed in a given location and not transferred from place to place in its
service life.
As such, standby battery life is directly affected by and will be degraded if subjected to repeat cycling.
Depth of discharge, number of discharges, rate of discharge, and the interval between discharges are all
determining factors in battery life. Cycling should therefore be kept to a minimum.
To ensure that the battery will perform during power outages and other emergencies, it is strongly
recommended that testing be kept to a minimum in accordance with the following practices:
• The performance of an initial acceptance test not to exceed user’s originally specified system
• reserve time.
• A full-load service test should be performed not more than once every 12 months to verify battery
capacity at user’s originally specified discharge rate.
• A monthly transfer test not to exceed 30 seconds of battery discharge time at user’s originally
specified discharge rate to verify system load transfer and electrical system performance.
• The time that is required to synchronize the UPS and return to rectifier power must be taken into
account when calculating total discharge.
The user is expected to maintain complete records of all battery testing and emergency discharges in
order to comply with the requirements of the warranty.
10.3 High Temperature Operation
Operating a battery at temperatures exceeding 77°F (25°C) will reduce the battery life.
Elevated temperatures accelerate the electrochemical reaction within the lead acid battery.
For additional information, refer back to Section 8.3.
CAUTION:
RECHARGE BATTERIES AS SOON AS POSSIBLE AFTER AN EMERGENCY DISCHARGE.
Failure to recharge batteries immediately after emergency discharge may lead to sulfation,
or in the case of deep discharge, a complete battery failure due to hydration. If recharging
at freshening/equalize voltage is impractical, promptly recharge at float voltage.