Hello, I'm about to build my own Onewheel alternative.
I'm going to use 2x 350W 36V bldc motors for the hoverboard, 2x ESC with hall sensors support, ESP32, MPU6050, resistive sensor for foot activation, some Neopixel LEDs and 2x 6s2p batteries wired in series (together around 44V) to power it all.
Software wise I plan to use PID control with PWM output, some safety features with resistive foot sensor and later bluetooth connectivity with mobile app(maybe some gps tracking).
I selected all the components except the batteries, because when I look at the products on aliexpress, I am confused about their capacity. This model (like everyone else) I'm interested in is saying it's 40Ah.
Can someone please explain to me what this means? I would expect something like 4Ah.
40Ah means that in principle, the battery can supply 40 Amperes continuous current for about 1 hour, 20 A for 2 hours, etc. However, battery manufacturers tend to exaggerate.
I doubt the validity of the advertisement. A battery with 40Ah is going to weigh 20 lbs... A "large" ebike battery only holds 20Ah (and weighs 10 lbs) with a range of 40 miles.
24v * 40Ah = 960Wh.
960Wh / 20Wh per mile = 48 miles calculated.
I don't think that's quite right. If you connected two batteries in series, the voltages would add up. So if each battery is 24 volts, the total would be 48 volts.
48*40 = 1920
As previously stated,
So for the next calculation, let's stick with a more conservative estimate of 1500 Wh. If there are two 350W motors on my Onewheel bike, the total power consumption is 700 W. So using 1500 Wh / 700W would give me approximately 2 hours of use time at full speed. Full speed should be something around 16 km/h, so I could travel something around 30 km? Am I right?
