Xantrex Technology Link 2000 - Manual (Page 38)

Calculating External Battery Charging Time
975-0343-01-01 B-3
Calculating External Battery Charging Time
Formula
Charging time will depend on the capacity of your battery
and on how deeply it is discharged.The following equation
calculates an approximate charging time:
where:
Example
A Group 27 size battery rated at 82 amp-hours is 40%
discharged, that is, it has a DOD = 40. Charging time with a
Duracell® Charger unit is calculated as follows:
Charging Time: Battery recharge time in hours
CAP: Battery capacity in amp-hours
DOD: Battery depth of discharge in per cent. A fully
discharged battery has 100% DOD
CC: Charge current, the rated current output of the
charger in amperes
80%: Typical charging efficiency for lead-acid batteries
Charging time = CAP x DOD
CC x 80%
Charging time = 82 Ah x 40% = 2 hours
20 A x 80%
Duracell_Charger15.book Page 3 Friday, June 15, 2007 2:34 PM