29
NOTE
Charging at 50% of nominal current or lower will extend the battery module cycle life.
10.4.1 Bulk Charge
Bulk phase. The Bulk Charge is the first phase of the charging process, also called
the constant current phase. This phase is when the charger’s maximum current is
directed to the battery module until reaching the desired voltage. The Bulk phase
will recharge the battery module to approximately 90-95% SOC.
If the charging source is a generator or other charge source that is not efficient at
low output current, a single-stage charge may be appropriate. A single-stage charge
will only complete the Bulk phase portion of the charge curve. This method should
return the battery module to 90-95% SOC.
Refer to Table 3-1, ELEMENT ESS Electrical Specifications for charging parameters.
10.4.2 Absorption Charge
Absorption phase. The second phase of the charging process is Absorption Charge,
also called the constant voltage phase. In this phase, the charger reduces current
accordingly to maintain the desired voltage.
Refer to Table 3-1, ELEMENT ESS Electrical Specifications for charging parameters.
10.4.3 Equalization Charge
CAUTION
FIRE AND BURN HAZARD
Do not perform an equalization charge on the ELEMENT ESS battery module.
Failure to follow these instructions can result in minor to moderate injury.
Do not equalize charge the ELEMENT ESS battery module. Equalization charging
is intended only for lead-acid batteries. An equalization charge is a purposeful
overcharge that targets a voltage above the standard charge voltage to remove
sulphate crystals that form on lead-acid plates over time.
10.4.4 Float Charge
Float phase. Float charge, the third phase of charging, is optional. During this stage,
the battery module is maintained at 100% SOC for extended periods, counteracting
any self-discharge or parasitic loads.
• Not necessary. Float charging is not required.
Refer to Table 3-1, ELEMENT ESS Electrical Specifications for float parameters if
needed.
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