An absolutely fuseinating question

[PJ-27]

I highly doubt you'd pull enough amps long enough to damage a Li-Po, except maybe in some extreme circumstances, in which case a big Maxi/Blade/Car fuse on the Li-Po should suffice.

I'd just consider what you want to protect, so ESCs. If you burn out a motor it'll kill the esc so put a ~30a fuse there.

It would be a real shame to lose a fight beacuse you blew a fuse, but at the same time if I motor dies you've lost anyway so don't let it take more componenets with it!

Putting fuses in parallel is just more potential points of failure in your bot. I'd avoid.

[Ellis]

We have have won fights having blown motors! At MMM I think we only had one fight in which we didn't destroy a gearbox and thus a motor.

I don't think the speedos will mind having a stalled 550 on them. Even two, which unless something goes really wrong, will never happen. Not only should they be fine on paper, but in practice, again, the ESCs were subject to stalled motors at MMM and they were fine.

I have an idea that may solve some of our gearbox issues anyway, which in turn should reduce the number of motors the machine eats, actually reducing stress on the speedos.

Have spoken to dad, and we'll get some 80a and 100a jobbies on the go soon. Thanks again.

[widow_twanky]

Time/current charachteristics for automotive fuses are here:

http://www.littelfuse.com/products/fuse ... Delete.pdf

Can't find it for the higher fuse ratings but the curves wont change just where they are on the graph. If you scroll to the bottom you'll see the curves.

Basically for a 1A fuse you get:

Instantaneous: 10A
0.1s: 3.5A
1s: 2A
10s: 1.5A
100s: 1.25A
1000s: 1.15A

Approximate figures because the graph isn't too accurate but interpolating (which in the case of fuses is perfectly valid but doesn't give a fine accuracy) that to a 100A fuse you get:
0.1s: 1000A
1s: 200A
10S: 150A
100s: 125A
1000s: 115A

In practice they are designed to take the peak current if they're sized to take the running current. We've used a 20A fuse on two drills and a set of gimsons in BOOM! since it was built. I put a 25A fuse in Diablo and it runs no probs. Will be interesting to see wether it holds on the Wyachi's in combat but I suspect it will.

Andy