Equalization is a controlled overcharge designed to balance the voltage in each battery cell. Equalization is also used to mix battery electrolyte and to remove sulfate build up from the plates. Only liquid lead acid batteries can be equalized using a specific type of charger designed with an equalization setting. Battery equalization is not an automatic process, but must be manually performed. Due to high gassing temperatures and excess voltage that occurs with battery equalization, it is recommended that you have this procedure performed by a qualified technician.

How to program the inverter control panel is dependent upon the type of inverter installed in your RV. Refer to your inverter operator's guide for the recommended set up. Read the fine print. RV electronics can be sensitive to voltages 15 v and up. True equalization may push the batteries up to 16 volts.

Remove metal jewelry. Wear protective clothing and safety goggles. Never smoke around batteries during the gassing stage. Perform the equalization process in a well-ventilated area. Extend battery trays to the full out position for additional venting space. Be aware of gassing that can occur as batteries heat up. Avoid windy conditions that can blow battery acid onto the sidewalls and destroy painted surfaces or cause personal injury.

Fill each cell with distilled water to 3/8 inch below the vent tube. Bring the batteries up to a full state of charge. Disconnect all DC electrical loads. Failure to unhook all DC loads may damage component circuit boards. Using a battery hydrometer, check each cell and record the readings. Loosely replace battery caps to trap excess gassing.

Closely monitor the batteries during equalization. Stop equalization if batteries become too hot or spewing occurs. If conditions remain the same, end the equalization process after four hours (most inverters have a four hour EQ timer).

Normal use and maintenance of the battery bank will eliminate the need for equalization. Batteries that sit unused for long periods of time may be reconditioned through equalization. If you find it necessary to equalize RV batteries more than two times per year, this may indicate the need to replace the batteries. Replace all batteries in one bank to prevent a weakened battery from prematurely discharging the new cells.