Schumacher 200.71230 Calculating charge time Chart Method, Charge Rate, 40 AMP

The 2 amp charge rate may not indicate activity on the meter. The meter does not have the resolution to display this low rate.

13.calculating charge time

13.1The Chart Method

Use the following table to more accurately determine the time it will take to bring a battery to full charge. First, identify where your battery fits into the chart.

•Small batteries — motorcycles, garden tractors, etc. — are usually rated in Ampere Hours (AH). For example: 6 to 12 AH, or 12 to 32 AH.

•Batteries in cars and smaller trucks are usually rated in Reserve Capacity (RC), Cold-Cranking Amps (CCA), or both.

•Marine or deep-cycle batteries are usually rated in Reserve Capacity (RC).

•NR means that the charger setting is NOT RECOMMENDED.

Find your battery’s rating on the chart below and note the charge time given for each charger setting. The times given are for batteries with a 50-percent charge rate prior to recharging. Add more time for severely discharged batteries. Time is given in hours unless otherwise specified.

			CHARGE RATE/
BATTERY SIZE/RATING			CHARGING TIME - HOURS
			2 AMP	40 AMP
SMALL	Motorcycle, gar-	6 - 12 AH	2 - 4	NR
BATTERIES	den, tractor, etc.	12 - 32 AH	4 - 10	NR
	200 - 315 CCA	40 - 60 RC	11 - 14	30 to 45 min.
CAR/TRUCKS	315 - 550 CCA	60 - 85 RC	14 - 18	45 min - 1
				hour
	550 - 1000 CCA	85 - 190 RC	18 - 35	1 - 2 hours
		80 RC	18	NR
MARINE/DEEP CYCLE		140 RC	27	NR
		160 RC	30	NR
		180 RC	33	NR

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