Is there any reason why the title would present a problem? I had a faulty 20A ESC and blew another one. I had spare 30A ESCs for a planned upgrade and read around - the scant info found suggested that higher current capacity shouldn't matter. I'm running the 850kV motors and a 2650mAh, 3s lipo.
NB: quad still yet to fly. Just curious as to general thoughts from the learned on this.
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Shouldn't be a problem. The 30A one is possibly the same as the 20A except for some additional FET's. It may just run a bit cooler. You need to calibrate them together, obviously.
A mate once broke a motor on his experimental quad. While waiting for a replacement, he put a pair of completely different motors (kV and size) on one axis (in + config). It flew fine, apart from some yaw control imbalance.
So I have 2 20A ESCs across one axis and 2 30As across the other. I don't think I was clear on that. Should that present any problems?