Alpha Technologies AlphaCell SMU-F - Manual (Page 9)

9 SMU-F-BATTERY
Specifications are subject to change without notice.
Torque specifications
Torque specifications are
8.4Nm (75lbf-in). Torque all terminal connections to the specified
value. Improper torquing can result in loose connections or damaged terminals.
Electrolyte
The electrolyte is sulfuric acid with a specific gravity of 1.320 at 77ºF (25ºC) and has the same
purity characteristics as other types of high quality lead acid batteries.
Short circuit
SMU-F batteries are designed to withstand a short circuit current for 1 minute without damage.
Cycling
The SMU-F range of batteries will deliver 200 cycles (at C
8
to 1.75Vpc and 77ºF (25ºC)).
Life
The end of service life of a battery is defined as the point at which the battery’s actual capacity
has reached 80% of its nominal capacity. The design life of the FA family of batteries is 15 years
of float life. However, since users cannot often duplicate laboratory conditions, such as controlling
temperature, voltage, and AC ripple, this period may vary. Battery life will decrease by roughly
half for every 14.4–18ºF (8–10°C) above or below nominal operating temperature (68ºF (20°C)).
Low Voltage Interruption
Because the DC load will shut off if the voltage gets too low, damaging equipment, Alpha
Technologies recommends the use of Low Voltage Disconnects (LVDs) to maximize battery life.
LVDs protect sensitive equipment from low voltages, and prevent the battery from being over-
discharged. LVDs can be placed on either the load or battery side.
A string of batteries is a series of individual 2V cells working together. After discharge, the
voltages of individual cells vary based on the exact capacity of each cell. Most users try to
terminate the load when the batteries reach 1.75Vpc to ensure no individual cells fall below
0 VDC. Cells that fall below 0 VDC are said to be reversed. Alpha Technologies strongly
recommends that cells which have been reversed be replaced immediately.
1.0 Introduction, continued
1.2 Specifications and General Information
Table 1-1, Mechanical Specifications
Fig. 1-1, Dimensions
Type Length
(in/mm)
Width
(in/mm)
Height
(in/mm )
Weight
(lb/kg)
Standard Stud Size *
SMU-F 12-50-FR 15.4/390 4.1/105 8.9/227 47.4/21.5 8mm
SMU-F 12-75-FR 21.9/558 4.1/105 8.9/227 68.3/31.0 8mm
SMU-F 12-85-FR 15.6/395 4.1/105 10.6/270 69.5/31.5 8mm
SMU-F 12-105-FR 20.1/511 4.3/110 9.4/238 79.4/36.0 8mm
SMU-F 12-125-FR 21.9/558 4.9/125 10.6/270 108.0/49.0 8mm
SMU-F 12-155-FR 21.9/558 4.9/124 11.1/283 119.0/54.0 8mm
SMU-F 12-170-FR 21.9/558 4.9/124 12.2/310 129.8/59.0 8mm
*a
6mm stud size can be ordered as an option