Deka Unigy II AVR45 Series, Installation And Operation Manual

5.  Charging / load cable(s) should be tin or lead plated copper lugs 

able to accept a 1/4 –20 bolt. Cable lugs should be coated with 

a thin film of NO-OX-ID “A” grease. System connecting cables 

can be attached to any battery post of the multipost connector. 

System connecting cable(s) supplied by others.

Select cable size based on current carrying capability and 

voltage drop.

Select cable size based on current carrying capability and 

voltage drop.

Cable size should not provide a greater voltage drop between the 

battery string and operating equipment than required. Excessive 

voltage drop in cables will reduce the desired reserve time and 

power from the battery string.

Cable sizing is the responsibility of site electrical engineer.

SYSTEM OPERATIONS

Charger Voltage

  2.25 V per battery ± 0.01 @ 77°F (25°C)

   When setting the float voltage on the charger, the battery string 

should be set to float at the required cell float voltage times the 

number of cells per battery string. The charger must be able to 

maintain the battery string voltage within ± 0.5% of the desired 

level at all times.

Charge Current

   Charge current should not exceed the recommended minimum 

and maximum requirements as detailed in Appendix C.

Temperature Compensation

   Battery voltage should be adjusted for ambient  

temperature variations.

2mV per °C (1.8°F) per 2V cell.

Consult 

Voltage Compensation Chart (Appendix C)

 for  

temperature compensation voltage maximum and minimum limits.

Cell Voltage

   Although the charger must maintain the battery string voltage 

within ± 0.5%, individual cell voltages may vary by ± 0.05 volts 

of the average cell float voltage.

Equalizing

   Upon installation of the battery string, an optional charge at a 

constant voltage equal to 2.40V per cell ± 0.01 @ 77°F (25°C) 

for a maximum of 24hrs may be performed. (NOTE: Verify that the 

higher cell voltage will not adversely affect any other connected 

equipment). If this is done, be sure to reset the charging equip-

ment to the proper float voltage.

Battery Operation

   Battery string operating temperature will affect battery string  

capacity and operating life. 

Temperatures greater than 77°F (25°C) will reduce the operating 

life of the battery. For every 13°F (7°C) increase in operating  

temperature above 77°F (25°C), the warranty period will be  

proportionally reduced by 50% as shown below:

5

6.  Reference Appendix D for layout drawings detailing cable and 

connector quantity and placement.

7.   Upon completion of installing, all connectors / cables hardware 

should be torqued to 125 ± 5 inch pounds (14.1 ± .5 Nm).

Final Assembly Check Procedure

1.  For future identification of all cells, number individual cells in 

sequence, beginning with number one (1) at the positive end of 

the battery. The last cell of the battery string is located at the 

negative output terminal.

2.  Read and record the voltages of the cells to assure that they are 

connected properly. The total battery string voltage should be 

approximately equal to the number of cells connected in series 

multiplied by the measured voltage of one cell. If the measure-

ment is less, recheck the connections for proper polarity. Verify 

that all cell and battery string connections have been properly 

torqued.

3.  Measure and record the intercell connection resistance using a 

micro-ohms meter. This helps determine the adequacy of ini-

tial connection installation and can be used as a reference for 

future maintenance requirements. Refer to the recording forms 

in Battery Maintenance Report in Appendix E of this manual. 

Review the records of each connection and detail resistance 

measurements. Clean, remake, and re-measure any connection 

that has a resistance measurement greater than 10% of the  

average of all the same type connections (i.e. intercell, inter-

module, etc.).

4.  Battery string performance is based on the output at the battery 

terminals. Therefore, the shortest electrical connection between 

the battery system and the operating equipment results in maxi-

mum total system performance.

Operating Temperature

Proportional 

Percentage (%) 

of Life

ºF

ºC

77º

25º

100%

81º

27º

80%

87º

30º

60%

90º

32º

50%

   It is not recommended to operate the battery string above 95°F 

(35°C). If operating temperatures are expected to be in excess of 

95°F (35°C), contact East Penn for recommendations. Operating 

a battery string over 105°F (40.5°C) for more than 8 hours may 

void warranty.