User Manual

RS02109/0814/CD 21 www.cdtechno.com
9.5 Performance Tests
If desired by the customer, a full-load performance test can be conducted at the user’s original specified
discharge rate or the appropriate rate based on connector sizing per the following procedure:
• Equalize charge the batteries if necessary, refer to section 8. 3 equalization notes.
• Let batteries float for 72-hours.
• Perform the annual inspection.
• Run a discharge test at the system designed rate per IEEE 1188.
Part 10 - Battery Degradation
10.1 General Informat ion and Prec auti ons
W hen properly maintained and charged, the Liberty 2V batteries should provide many years of trouble-free
ser vi ce. H o weve r, de sp it e t hei r inh er ent d epe nda b il it y, f a il ur e t o op er ate an d m ai nta in t h em cor re ct ly 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 C ycle Life
Standby batteries such as the Liberty MSE are designed and constructed to provide long life in
co nt inu o us f lo at s er vi ce. T he y diff er i n th e ir d es ign f r om th e 2V L ib ert y D CS c yc li ng batteries. Standby
batteries are cont inuo usly c harg ed at a com par ati vely l ow float volt age in para lle l with the load, ready to
supply insta nt aneous D C power either dire ctly to the load or by way of interfacing electronics, such as an
uninterruptible power suppl y (UPS) s ystem. The name “st ationar y” implie s the bat tery is usually
per mane ntl y place d in a gi ven lo cat ion and n ot tran sfer red from place to place in its service life.
As such, standby battery life is directly affected by and will be degraded if su bj ect e d t o r ep eat ed cycling.
Dept h of d isch arge, num be r of discharges, rate of discharge, and the interval between discharges are all
det erm i ni ng f act ors in ba tt er y l if e. Cyc l ing s hou ld t heref or e b e ke pt to a minimum. To ensure that the battery
will perform during power outages and other emergencies, it i s str ong l y re c omm en de d t hat t est ing b e k ept t o
a minimum in accordance with the following p ractices:
• 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 transf er test not to exceed 30 secon ds of batter y disc har g e t im e at u s er ’s or ig i na ll y
specified discharge rate to verify system load tr ansf er and elect rica l syst em perf orm ance.
The time t hat is required to synchronize the UPS and retur n to rectifier power m ust 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 t he requirem ents of the warranty.