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I could do with some help with fuse ratings for my MTB restoration. It was built in the mid-50's for i.c. power and has not seen its bottom wet since 1962. Needless to say, it now has a couple of brushless motors plus a lipo pack , ESC's and a sound system. I am about to put the fusing in but am concerned about the initial start point for the fuse capacity. I do not mind burning fuses to achieve the level required but where would be a good starting point? This is by far the most potent power train I have experienced and I do not want to torch a family heirloom....
The setup is as follows:
Motors - 2 x EnErG 600D/R 1550 ( C35-14) pulling about 42 amps max. ESC's - 2 x Hawk BL 50A on 2 x lipo cells
As a start the way I do it put boat in water with ammeter connected in series with battery positive . Now hold boat stationary in water and gradually apply full power to motors and take note of amps reading now get fuse just above that reading and go from there
I had wondered about doing that. Having never used a brushless before, a couple of years ago I 'tested' a much smaller single motor in the household bathroom (I am not married!) and was very surprised how little water was left it when I pushed the throttle fully forward.. Thank you. your thinking is sound!
Sorry Doug, I have mixed up you and another so this will make more sense if I say thank you for your advice. I wll combine it with the lakeside test above.
Hi Charlie, don't mention it, glad to help. 45 years electrical & electronic engineering must be useful for something 😉 I'm also new to brushless and not sure yet how they behave when stalled. Must do some tests soon.🤔 Remember: fuses are essentially there to stop wiring bursting into flames and igniting the surroundings; house, boat, plane, model - whatever! So make sure ALL your wiring (including battery leads) is at least as thick as that on the ESC and motor! 👍 Good luck, and have fun, Doug 😎 PS I'm also single and nearly flooded the bathroom a while ago getting my 5 foot Graf Spee to float to check ballasting!! 😁
Young at heart - slightly older in other places 😉 cheers Doug
Hi Doug Brushless melt when stalled if you are lucky. No fuse and high power battery usually results in the ESC also melting or a small fire that usually quickly spreads to the rest of the model. Not sure if I would go much above 25 amps on a 50 amp ESC, most are overated and will probably need watercooling at full capacity.
Thanks for yet more good advice, Dave M . I will try 20-25 amp fuses to start with. As it happens, there is the original ic water cooling system still in the hull, kept for realism but I could easily make it functional.