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10.5 Charging Voltage and Current
Most garage and consumer (automotive) type battery chargers are bulk charge
only, and have little (if any) voltage regulation. They are fine for a quick boost
to low batteries, but do not to leave them on charging for long periods.
Use an external Constant Current charger, which is set not to deliver more than
12% of the Reserve Capacity (RC) rating of the battery and monitor the
State-Of-Charge (SOC). Timers that will cut-off the charger when charging
hours are completed will help prevent overcharging of the battery.
NOTE:
For discharged batteries, the following table lists the recommended battery
charging rates and times:
The best method is to slowly recharge the battery at 70° F (21.1° C) over a 10 to
20 hour period (C/10 to C/20)
current charger) because the acid has more time to penetrate the plates and
there is less mechanical stress on the plates.
*
NOTE:
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Reserve Capacity (RC) is the number of minutes a fully charged battery
at 80° F (26.7° C) is discharged at 25 amps before the voltage falls
below 10.5 volts. To convert Reserve Capacity (RC) to Ampere-Hours
(AH) at the 25 amps rate, multiple RC by
Reserve Capacity (RC)
Rating
80 Minutes or less
[32 Ampere-Hours or
less]
80 to 125 Minutes
[32 to 50
Ampere-Hours]
125 to 170 Minutes
[50 to 68
Ampere-Hours]
170 to 250 Minutes
[68 to 100
Ampere-Hours]
Above 250 Minutes
[over 100
Ampere-Hours]
C-rate is a measurement of the charge or discharge of battery
overtime. It is expressed as the Capacity of the battery divided by the
number of hours to recharge or discharge the battery.
For example, assume that the Amperes-Hour capacity of the battery is
220 AH, then it would take 11 hours (220 divided by 20) to recharge or
discharge the battery using a C/20 rate.
.4167.
Slow Charge
(RECOMMENDED)
15 Hours @ 3 Amps
21 Hours @ 4 Amps
22 Hours @ 5 Amps
23 Hours @ 6 Amps
24 Hours @ 10
Amps
*
using an external constant voltage (or tapered
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Fast Charge
5 Hours @ 10 Amps
7.5 Hours @ 10 Amps
10 Hours @ 10 Amps
7.5 Hours @ 20 Amps
6 Hours @ 40 Amps
Battery Analyzer
Series
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