How to calculate battery capacity for electric motor. 07 battery cycle life considerations run time note. Depending on the vehicles battery capacity it can take anywhere from eight hours to more than 16 hours to achieve a full charge using level 1 charging. Minimum starting torque 016 x 75100 2.
Most electric vehicle charging is done at home either via a conventional 120 volt circuit known as level 1 charging or a dedicated 240 volt line level 2 charging. Lets say you have an electric motor rated at 200 kilowatts kw at peak power output. Battery capacity in mah milli ampere hours battery life in hours.
If you ran that motor for 30 minutes you would use 100 kwh of energy 200 multiplied by 05 of an hour. Q is the battery capacity measured in amp hours. Minimum capacity x c 1000 must be at least equal to motor current.
In an ideal case the battery capacity formula would be. 9 x 10 2 nm 1275 oz in minimum required stalling torque 025 x 551002. 100 ah 48 amps drawn 208 hours of runtime.
For 14a 1300 x 25 1000 325 so plenty. To calculate how long a battery will last we need two figures. 50 ah 52 amps drawn 96 hours of runtime.
This explains why the lead acid battery has a small usable capacity for electric outboard. This states how many hours the battery can supply 1 ma of current or how many ma of current it can supply for one hour. Average run cycle is 10 hours.
However when the 2 105 at 20 hrs batteries in parallel are used and then put on charge after use the batteries typically register 50 charged. Battery capacity hours x amp run time. Charging an evs battery.
Hopefully you remember that amp hours are a measure of electric charge q the battery capacity. The lfp battery still remains high voltage after 97 capacity consumed. If we are using a 24v system that draws 1152 watts with two 50ah batteries in series 100ah total we would use the following equation.
The torque is proportional to the square of the voltage and the following values are obtained. It shows how the voltage drops at 1c discharge. Load current consumption of device in amperes.
1152 watts draw 24 volts 48 amps drawn at top speed. E is the energy stored in a battery expressed in watt hours. The batterys capacity and how much current will be drawn by the motor.
Using the inverter calculator indicates 1435 amps dc load and then running the sizing calculator suggests that i need battery capacity of 306 ah 20 hrs. V is the voltage of the battery. 700mah at 25c might just about be enough but give very short flights.
Hence the final version of the battery capacity formula looks like this.
Amazon Com E Bike Battery 48v 20ah Lithium Li Ion Battery With 4a Charger For 1000w 1500w E Bike Kit Electric Bicycle Scooter Rear Rack Power Sports Outdoors
www.amazon.com