![]() If you want to see the formula yourself, see our Math behind the Magic article.Īmperage of Load Applied - The next field is where the amperage of the load you are placing on the battery is entered. Peukert's Constant - The seventh field is Peukert’s constant, and is figured using the previously given information. The sixth field accounts for age of the battery. In our example it is the 20 Hr rate.Ĭ2 and R2 - The third and fourth fields are for the second set of ratings, in this case 216AH at a 100 Hr rate.īattery Temperature and Age - The fifth field is to adjust for extreme environmental temperatures, in our example it is over 85 deg F. This leads to the second field, which is the hour rate that the AH is given at. Typically you will have a 100hr rate, a 20 hr rate and a 10 hr rate readily available from the manufacturer.Ĭ1 and R1 - The first field of this calculator is for the first AH rating for the battery. If you do not know, you will need to contact the manufacturer to find out. It requires 2 separate AH ratings at different hour ratings. This calculator is designed to tell you exactly how long your battery will last given a set amperage load that is put on it. ![]() Capacity AH rating 1 C1Ĭheck if Battery Temp is Over/Under 0-85 ☏Ĭheck if Battery is more than 6 months old. For an explanation of why a calculator is necessary to figure out the true run time of your battery see Puekert’s Law. In order to use this calculator you will need two separate AH ratings, given by the manufacturer, as well as the amperage, in direct current of your load. This calculator is intended to help you figure out how long your lead-acid ( Wet, AGM, Gel) battery will last under a specified load.
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