How to choose the battery current

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6 Frequently Asked Questions about “How to choose the battery current”

How do I choose a battery size for my project?

The first step is determining how much current your project will consume. To determine the current of your load you can use average or max current. Sizing the battery based on the max current will be the most conservative estimate as it assumes your application is running at full power all the time.

What is battery current?

Battery current is a main driver of how much runtime you will get out of a battery. Battery current is expressed in Amp-Hours (Ah). Amp hours is the amount of current sourced from the battery that would cause it to fully discharge in 1 hour. For example, if you have a 5Ah battery and a load that draws 2.5A, your battery will run for 2 hours.

How do you choose a battery?

Each type of battery has its own strengths and weaknesses, and it is up to the operators of battery-requiring applications to choose the one that best meets their requirements. Batteries have a predetermined lifespan and number of cycles depending on the climate (ambient temperature) and type of use (depth of discharge).

How do I determine the current of my battery?

To determine the current of your load you can use average or max current. Sizing the battery based on the max current will be the most conservative estimate as it assumes your application is running at full power all the time. Using average current will be the most representative of normal use but might reduce runtime for extreme scenarios.

How do you calculate battery capacity?

The required battery capacity is set by the current load and time. This is found by multiplying the current load and hours together for amp-hours. Capacity needed (in mAh) = current load (in mA) × time (in hours) Capacity needed (in mAh) = 600 mA × 100 h Capacity needed (in mAh) = 60,000 mAh

How to calculate battery size?

Once you know the max or average current draw of your load, you can calculate the battery size. Using my e-kayak project as the example, my max continuous current draw is 12A at 24V. Since I wanted a best case runtime of about 2 hours, I needed to pick a battery with a capacity around 12A * 2 hours = 24Ah at 24V.

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