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[Rottweiler]

I have a quick question regarding my tug. I have fitted everything, tried her out on the table last night and everything was fine, I put her in the bath, and throttled her up to about half throttle and the inline fuse blew, I replaced it and have just done the same again in the bath, and again at about half throttle the fuse has blown, obviously under load she is drawing more amperage. This is a 5amp fuse. Should I just put a higher rated fuse in like a 7.5amp, or do you think I maybe need a higher rated ESC than the P81? I appreciate your advice
Mick F

[gribeauval]

You need a higher rated esc Mick, the P81 is only rated for 5 amps so adding a higher fuse could damage it.  You need to check the current the motor is taking at more than half throttle.


Mike

[Rottweiler]

Thanks Mike I was tempted to put in a 15amp esc in the first place.
Mick F

[Stavros]

How big is tug
What Motor is in tug
What size prop
What voltage are you running
 
 
Dave

[inertia]

Mick
P81 has a single MOSFET which is reliable only up to 5A without any heat-sink. I can easily upgrade it to 10A (P79 spec) by replacing this one component, if you'd like to contact me via PM. Putting a 7.5A fuse in circuit with a 5A ESC makes no sense at all.
Dave M

[Rottweiler]

Thanks Guys.I actually asked the question for a guy who was not actually on Mayhem,and he has now joined our band of merry men.Hopefully he can now take over the thread himself! Another Dave!
Mick F

[Davevince]

Thanks for the help, especially to Rottweiler for posting this for me. I have since bought a P80 ESC, (20amp rated) and fitted it with a 10 amp inline fuse. I have tried my model in the bath again and she throttled up and stayed at full throttle for a full 5 mins with no problem. Should I carry on with the 10 amp fuse or up rate it to the 20 amp rating of the ESC? Thanks

[gribeauval]

If it aint broke,   Don't fix it !!!


Mike

[malcolmfrary]

Thanks for the help, especially to Rottweiler for posting this for me. I have since bought a P80 ESC, (20amp rated) and fitted it with a 10 amp inline fuse. I have tried my model in the bath again and she throttled up and stayed at full throttle for a full 5 mins with no problem. Should I carry on with the 10 amp fuse or up rate it to the 20 amp rating of the ESC? Thanks

Having a 20A ESC protected by a 10A fuse is a good thing.  The ESC will not supply more than the motor demands, and as long as the motor demands less than the fuse can handle, everything will be reliable and safe.  It is now working as it should with a good safety margin.  Let it be.