t d, where t d is the discharge duration. The formula I used is shown in Equation 2.

2: where. Second, conversion is needed for this to be in watt-hours through multiplication of the AH figure with the battery voltage, as a label of 12V. June 02, 2018 Basic Formulas, The capacity of a battery is a measure of charge it can deliver to an external circuit. P = V * I. For a given capacity, C-rate is a measure that indicate at what current a battery is charged and discharged to reach its defined capacity. Battery Capacity Formula and What you Should Know about it EE.

As energy E is power P multiplied by time T, all we have to do to find the energy stored in a battery is to multiply both sides of the equation by time:. Q(v) is the charge drawn from the battery as the terminal voltage has dropped to v [Ampere-Hours]. When the battery backup time is 5～10h, K = 0.85 ; When the battery backup time is >10h, K =1 ; For example: If the load is 8000W and backup time is 1 hour, the required battery capacity C = (8000W * 1)/(12V * 16 * 0.92 * 0.6) = 75.5AH. The calculation of the battery capacity is a bit simpler than the calculation of battery energy. When the latter is expressed in hours, the typical unit for battery capacity is the Ampere-hour. A 1C (or C/1) charge loads a battery that is rated at, say, 1000 Ah at 1000 A during one hour, so at the end of the hour the battery reach a capacity of 1000 Ah; a 1C (or C/1) discharge drains the battery at that same rate. You need to calculate the capacity so you can choose the right battery for yourself. Battery capacity formula. For a given capacity, C-rate is a measure that indicate at what current a battery is charged and discharged to reach its defined capacity.

Therefore select a 100AH battery to guarantee the battery backup time is more than 1 hour Method 2: Step aside, folks, genius calculation formula coming through…just kidding If you are planning to buy a new inverter battery, you surely must have reached a point where you got the need to calculate the capacity of the battery you need.Hence, you are here. Battery Capacity = in mAH (milli Ampere hours) Battery life = in Hours; Load Current = Consumption of device in Amperes; 0.7 = Battery Cycle life considerations (Run Time) Note: In an ideal case, the battery capacity formula would be; First off, battery capacity can be measured in terms of ampere-hours or ampere per hour, like a label of 20AH. As you might remember from our article on Ohm's law, the power P of an electrical device is equal to voltage V multiplied by current I:. Eq.

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