DISCOVER Tubular Gel OPzV Manuale operativo - Pagina 5

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• Always connect the individual series strings first and then check that the different strings are at the same potential

before connecting them together on the bus.

Notes:

• The combined performance data of all of the cells will be realized at the end pole/terminal of each string.

• Battery life or reliability will not be negatively affected if this form of paralleling is done correctly.

• Parallel connection of strings with different capacities as well as different ages is possible (the age and capacity of the

batteries within each string must be the same).

• The current during both discharge and charge will be split according to the capacity or age of the batteries respectively.

3.4 Cells in Series Strings

• Discover® Tubular Gel cells may be connected in series to increase system voltage.

• In the case of each series connected string, only use batteries of the same voltage, capacity, design and age.

• The resistance of the cables or connector bars in each string must be the same, e.g. same cross-section, same length

and same conductor type (copper, aluminum).

• Each string should be equipped with disconnect capabilities (breakers) for maintenance and safety purposes.

3.5 Pre-installation Control

• Check cells for evidence of leakage.

• All cells with visible defects such as cracked jars or containers, loose terminal posts, or other unrecoverable problems

shall be rejected.

• Before installation, in cases where the battery container is dirty, wipe with a dry anti-static cloth only.

• Carry out Open Circuit Voltage (OCV) measurements on each individual cell and check their compliance against

the following variation and absolute voltage criteria:

The OCV must not deviate from average more than ±0.025V for 2V cells

The OCV must not be lower than 2.05 Vpc

The OCV of a fully charged cell at 20°C/68°F should result between 2.12-2.15 Vpc

Per 10% Depth of Discharge (DoD) the voltage is reduced by .015VPC

3.6 Electrical Connections

• Ensure that the cells are installed and connected in the correct polarity.

• Check that all contact surfaces are clean. If required, clean poles/terminals with a brass brush/pad.

• You may slightly lubricate terminal inserts and connections with silicone grease. Petroleum-based lubricants are not

recommended.

• Tighten the terminal screws using a torque loading of 23 Nm or 17 Ft-lbs. Electrical connections between cells or

cells on separate levels or racks should be made making sure to minimize mechanical strain on the battery poles/

terminals.

• For systems where the total battery voltage is measured at the controller, use oversized cables between the controller

and the battery to minimize the voltage drop.

• Check the battery's total voltage. It should match the number of cells connected in series. If the measurement is

not as expected, recheck the connections for proper polarity.

• The installer of the battery is responsible for conformity to local electrical standards.

• For future identification, apply individual cell numbers in sequence starting from one end of the series string. Also apply

identification letters or numbers for the parallel strings.

• Only connect the battery to the DC power supply after ensuring that the polarity is correct, the charger is switched off,

and the load is disconnected.

3.7 Instrumentation

• For large installations consider using permanent instrumentation for measurements and alarms. These include voltmeters,

amperemeters, Ah counters, high and low voltage indicators, ground fault detector(s) and temperature sensor(s) for the

battery and the ambient air.

• For smaller installations, use portable test equipment. The battery temperature sensors shall be fixed on the cell side

wall or negative pole/terminal.

• The use of monitoring and recording systems is mandatory in "Hybrid" systems.

TERMINAL TORQUE

23 Nm / 17 ft-lbs

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