User Manual

RS02109/0814/CD 5 www.cdtechno.com
Part 1 - Introduction
The L ibert y 2V bat ter ies (L iber ty MSE or Libert y DC S) ref eren ced in t his doc ume nt are st ati onary,
lead-acid batteries. They are constructed with an absorbent glass mat (AGM) and are character ized as
Valve Regulated L ead-Acid ( VRL A). As VRLA, th ere is no free flowing electrolyte. They are constructed
with lead-calcium alloy grids, dilute sulfuric acid (electrolyte) enclosed in a flame retardant thermoplastic
container (non-flame retardant container also available) with a safety vent and a flame arresting disk to
prohibit a spark from entering the head space of the cell. This type of battery is nearly 100% recyclable.
At the end of life, please dispose of properly or consult C&D f or recycling information.
The Liberty 2V batteries are designed to provide reliable service life with minimal maintenance when
us ed in acc orda nce wit h this manual. They are a single cell unit producing a nominal two volts per
cell, which are connected in series for the desired system voltage. The cells are housed in steel modules,
coated with acid resistant paint. T hese modules come in varying height s, depending on the cell size
and two widths (3 cells wide and 4 cells wide), and can be st acked up to 84” high while maintaining
their seismic ratings.
The Liberty 2V series are to be installed in a horizontal position with all connections accessible from the
front of the system assembly. These cells are not designed for operation in any other orientation.
The Liberty MSE series is designed for float operation with minimal cycling. Typical applications include
Telecom, Switchgear/Control and other non-UPS applications which are subjected to 20 or fewer cycles
per year.
The Liberty DCS series is designed for cycling applications. Typical applications include Off-
Grid/Unreliable grid Telecom, Renewable energy or other stationary applications requiring a high number
of cycles throughout the life of the cell.
1.1 Cell Characteristics
Under normal float operation, Liberty 2V batteries can be installed in proximity to electronic equipment
and in computer rooms with occupied space. However, if subjected to excessive overcharge voltage,
hydrogen and oxygen can be vented into t he at m os pher e. T her ef or e, lea d ac id batt eri es sho uld
never be installed in an airtight enclosure. Sufficient precautions must be tak en to pr even t
excessive overcharge and containment of potential explosive off gases. All Lead-Acid batteries,
including Liberty 2V, are capable of generating excessive potentially explosive gases when charged for
prolonged periods at voltages higher than initial or equalizing charge. The Liberty 2V cells are equipped
with a “flash arrestor and pr essur e rel ief valve” as sembl y that seals t he ce lls dur ing n orma l charge
and operation but allows it to safely vent in case of overcharge. Removing the valve assembly can
ca use t h e r e leas e of pot entia l ly explosive gases and such action will void the warranty.