Colleagues,
I’m reading-up on rules and customs for charging lead-acid batteries. It appears that they have 2 charging regimes with different charging voltages: 2.30V to 2.35 V/cell and 2.40V to 2.45 V/cell (source: Table 4-5 here). That generally agrees with charging voltages imprinted on some of the batteries. For example:
Notice that initial charging current for Standby Use (lower charging voltage) has no limit. Charging current for Cycling Use (higher charging voltage) has a limit at 0.3C Amps. Without the limit the battery would pull 2C amps at that charging voltage.
Here’s what I’m struggling with:
In the vehicles, the starting battery, the system load, alternator w/ regulator are all wired in parallel. AFAIK, there is no current limiting between the alternator and the battery.
What’s the difference between these 2 charging regimes such that charging at lower voltage doesn’t have a current limit (or doesn’t need external current limiting)?
Any suggestion, insight or reference is really appreciated!
Cheers,
- Nick
I’m reading-up on rules and customs for charging lead-acid batteries. It appears that they have 2 charging regimes with different charging voltages: 2.30V to 2.35 V/cell and 2.40V to 2.45 V/cell (source: Table 4-5 here). That generally agrees with charging voltages imprinted on some of the batteries. For example:
Notice that initial charging current for Standby Use (lower charging voltage) has no limit. Charging current for Cycling Use (higher charging voltage) has a limit at 0.3C Amps. Without the limit the battery would pull 2C amps at that charging voltage.
Here’s what I’m struggling with:
In the vehicles, the starting battery, the system load, alternator w/ regulator are all wired in parallel. AFAIK, there is no current limiting between the alternator and the battery.
What’s the difference between these 2 charging regimes such that charging at lower voltage doesn’t have a current limit (or doesn’t need external current limiting)?
Any suggestion, insight or reference is really appreciated!
Cheers,
- Nick
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