![]() ![]() If you go this route, better current measurements are an easy way to improve accuracy, but Texas Instruments makes some "battery fuel gage" chips that are pretty slick too. This is not super accurate by any means, but if you're interested in a basic setup that will get you in the right ballpark this is it. In this manner you accumulate how much current you have "spent" and can compare that to how much you started with. spentCapacity = spentCapacity + (dut圜ycle*maxCurrent)*dT The battery C rate is calculated by dividing the discharge current by the theoretical current draw at which the battery would supply its rated capacity in one hour. For LiPo batteries, which are commonly used to power quadcopters, just multiply the number of cells in series with 3.7V. This means that you take your current and multiply it by whatever your sample time interval is, then add it to the previous measurement. So now that you have an estimate for current draw, you can do a simplistic state of charge estimate called " Coulomb counting", which is just current integration. Remember too that P=IV, so you could get a rated current by dividing rated power by operating voltage. Below is the Flight Time calculator for the PRISM Quadcopter configuration. From a PWM perspective, you are pulsing current at a constant voltage, so you could estimate current output to be (duty cycle)*(rated current) where rated current is the nominal current draw at your operating voltage. We have created the Flight Time Calculator to assist with providing realistic flight times based on payload and battery choice. ![]() Battery life is generally measured in amp hours. You may use the calculator to simply run through all the specifications for either one battery pack or two battery packs To use the RC LiPo Battery Power & Configuration Calculator, simply use the drop down box’s to select your battery pack specifications. In other words, the quadcopter achieves a maximum flight time of 767 s when a fully charged DC conventional battery having specifications as 3S, 2200mAh, 11. The battery size calculator calculates the battery size in ampere-hour (Ah). ![]()
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