Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 105)

105 017-882-B0-001 Rev. C2 (10/2013)
4.0
Maintenance
4.4 Battery Maintenance, continued
4.4.8 Battery Evaluation Procedures for AlphaCell Batteries
4.0 Maintenance, continued
To help identify batteries approaching end of life in an operating power system, the following test
should be performed at each maintenance interval. For accuracy, tests must be performed on
fully charged batteries.
Conductance/Impedance Test – Measure the conductance of each battery. Any battery that
possesses a conductance that is 50% less than the initial reading taken at the point of install can
be considered suspect of being below 70% capacity and should be evaluated further. The battery
temperature must be approximately the same each time this reading is taken (see Table 4-2
below). Use temperature compensation feature when using Midtronics meter.
Float Voltage Test – Measure the float voltage of each battery in the string that is on float charge.
Any battery in the string measured at 13.2 volts or less is a suspect battery and should be further
evaluated with the steps below. Any battery below 12.6 volts should be replaced. The 13.2 & 12.6
voltage values are based on a 77˚F (25˚C) temperature. Adjust the voltage for higher or lower
temperatures by 0.0168 volts per battery per degree Fahrenheit. The higher the temperature
above 77˚ F (25˚C) the lower the voltage will have to be adjusted and vice-versa for temperature
below 77˚F (25˚C). (i.e.: at a temp of 89˚F (32˚C) would have a corresponding float voltage of
13.0 volts).
Battery Replacement Criteria –Batteries with a Siemens number of 400 or less should be
replaced. Batteries with a Siemens number between 400 and 700 and failing the 10 minute Self
Test should be replaced. If the Self Test passes, the batteries will not be replaced. Batteries with a
Siemens number greater than 700 and passing the 10 minute Self Test should not be replaced. A
battery that drops below 10.8 volts during the 10 minute Self Test is suspect.
Table 4-2, AlphaCell Conductance Values, Healthy vs. Suspect Batteries
Midtronics Conductance
Models 3200/micro CELLTRON
3.5 HP 4.0 HP
Approximate Conductance Values (MHOs)
Healthy Battery @ 77°F (25°C)
1400-1850 1700-2500
Suspect Battery @ 77°F (25°C) in MHOs <680 <840
Midtronics Conductance
Models 3200/micro CELLTRON
85
GXL-HP
135 GXL* 160 AGM* 165 GXL 170XLT
Approximate Conductance Values (MHOs)
Healthy Battery @ 77°F (25°C)
480-720 900-1350 1040-1560 800-1200 1040-1560
Suspect Battery @ 77°F (25°C) in MHOs <240 <450 <520 <400 <520
Midtronics Conductance
Models 3200/micro CELLTRON
195
GOLD-HP
195 GXL
195
GXL-FT*
220 GXL
220
GOLD-HP
Approximate Conductance Values (MHOs)
Healthy Battery @ 77°F (25°C)
880-1320 880-1320 800-1200 960-1400 960-1400
Suspect Battery @ 77°F (25°C) in MHOs <440 <440 <400 <480 <480
(*) – Indicates Batteries not listed in the
menu list.