Xantrex Truecharge 20+ Amp Owner's Manual - page 43

Equalizing Flooded Batteries

3–9

Important

Turn off or disconnect all loads on the battery during equalization. The 

voltage applied to the battery during equalization may be above the safe 

levels for some loads. Be sure to check battery electrolyte before and after 

equalization. Fill only with distilled water. 

To equalize your batteries:

1. Using a toothpick or other small object with a fine point such as a 

paper clip or pen-point, press the recessed Equalize button on the 

control panel below the Charging and Ready indicator lights. Press 

and hold for about 5 seconds until both the Charging and Ready 

indicator lights illuminate. The charger is now in equalization mode. 

2. Monitor the specific gravity of each cell of the battery during 

equalization with a battery hydrometer. 

Equalization is complete when the specific gravity of each cell of the 

battery remains constant. Most lead-acid batteries have a specific 

gravity of approximately 1.265 when fully charged. 

3. To terminate the equalization charge when the battery reaches the 

target specific gravity, momentarily press the equalization button. The 

charger will go to float mode for three-stage charging or monitor 

mode for two-step charging.

4. If the specific gravity is still rising when the charger automatically 

exits equalization to float mode after 6 hours, you can initiate further 

equalization by pressing the Equalize button for five seconds. 

5. When equalization has finished, check the battery electrolyte level. If 

necessary, refill with distilled water only.