HEAVY Car project: im running 3 brushess motors (21.5 turns, 1855kv, max 22Amps draw), each with their own speed controller (35 amps each), by one lipo (5000mah, 2 cell).
is my safe to go? any possible fire issues?
3 Motors: link
3 ESCs: link
1 lipo:link
66 amps draw.
5 Ah battery.
About 13C.
Well within the capability of most RC hobby batteries, and the one you selected is 50C.
You should expect about 4 minutes of run time at full throttle. More if you are not running full throttle.
vinceherman:
66 amps draw.
5 Ah battery.
About 13C.
Well within the capability of most RC hobby batteries, and the one you selected is 50C.
You should expect about 4 minutes of run time at full throttle. More if you are not running full throttle.
so all i good right? what does the 50C represent? i always search it up and then forget its significance. also, at what volt per cell should i disconnect the motors? 3.7 volt? lower?
Big C refers to how many times the normal capacity a battery can safely provide without damaging the battery.
50 C means the manufacturer is claiming to have tested the battery with a 250 amp draw and determined that there was no undue damage.
I don't like to push things too far. I have used a lot of batteries and I find that you get a shorter lifetime if you push them to the limit.
But your scenario is far from that.
C-ratings are usually marketing speak rather than genuine tested maximum currents. They vary from reasonable to downright lies e.g. there's one make that claims max 150C which means you could in theory discharge it fully in 24 seconds. Never going to happen.
You want the battery to recover to 3.7V/cell after the load is removed. That usually means you can go down to about 3.2V/cell under full load.
Steve