Last night I realized my boats battery was dead and I am suppose to be taking the boat out tonight, but I need to recharge the battery. Hopefully the marina crew guys will be able to do it for me this afternoon, but if not I need to buy a charger and recharge it. How long does it usually take? Thanks, Jeremy
How long to recharge a battery?
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Depends on
how big a charger and how big a battery. Only you know that. Read the Ample Power Primer on batteries, download from www.amplepower.com Stu
how big a charger and how big a battery. Only you know that. Read the Ample Power Primer on batteries, download from www.amplepower.com Stu
Charging time
Jeremy, I just purchased a Xantrex charger and there is a formula in their user manual to calculate the battery charging time with one of their unit. I am including the formula in the picture. Hoping this will help!
Jeremy, I just purchased a Xantrex charger and there is a formula in their user manual to calculate the battery charging time with one of their unit. I am including the formula in the picture. Hoping this will help!
Formula
Here is the 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. Charging time = CAP x DOD CC x 80% where: 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 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 20 amps unit is calculated as follows: Charging time = 82 Ah x 40% = 2 hours 20 A x 80%
Here is the 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. Charging time = CAP x DOD CC x 80% where: 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 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 20 amps unit is calculated as follows: Charging time = 82 Ah x 40% = 2 hours 20 A x 80%
Formula
Jeremy, the formula did not come out correctly Here it is: Charging time = (CAP x DOD) / ( CC x 80%)
Jeremy, the formula did not come out correctly Here it is: Charging time = (CAP x DOD) / ( CC x 80%)
1.25
1. An appropriate "fast charger" could recharge a flooded battery in about 75 minutes. 2. You don't have one (appropriate charger).
1. An appropriate "fast charger" could recharge a flooded battery in about 75 minutes. 2. You don't have one (appropriate charger).
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