Technical Tips

Hawker Genesis Cells in Portable X-Ray applications

CV Charger should be putting out 128V- 130V (Check open circuit voltages and the charge voltage)

Voltage for each cell after fully charging should read 12.9 to 13.3. All 9 cells should read within 2%-4% of each other

Check following:

1. Any physical damage to a cell or terminals
2. Terminal torque attachment should be 60in.-lbs (6.8nm). Over-torquing can led to premature failure. Loose terminals can also result in premature failure.
3. How is unit used? After deep discharge has it been plugged in to recharge overnight? If discharged & let to sit without recharging for a week, for example, cells can recover but won't last as long. If this occurs more than once, cells can fail due to dryout.
4. Temperature should not exceed +45 degrees C
5. Is there a heat source affecting temperature of any of the cells in the string?
6. Undercharging will result in premature failure
7. Were all cells installed at the same time
8. Check manufacturing date codes of the cells (have 5 year shelf life)
9. Is unit subjected to Shock or Vibration
10. Unit may have reached its Cycle Life - G26EP cells will last approximately 300 or more cycles at 100% Depth of Discharge, will last 600 cycles at 50%DOD if properly maintained. This can be determined by Mfg (check if Positive Grid Corrosion has occurred)