I’m trying to figure out what connector to use for phase wires for my under-board setup.
I’m using 12S2P with a 6384 motor and Flydragon 80A ESC.
I see others using things like AS150 bullet connectors or other above water solutions.
It looks like FoilDrive use a MR60 connector (which I would prefer due to it’s small size):
Is that correct - or is it bigger (I’ve searched and cannot find a larger MR connector)?
I’m curious to know if this is too lower amperage connector for my 12S setup?
The MT60 also would suit - but not sure if can handle the amperage.
If not can anyone suggest a better one that is compact?
I can create a 3D printed surround/mount for it to make it waterproof if need be.
Great, thanks for the info. They are the MR60 connectors.
How have you limited your system to 60A?
Also, do you have a fuse on your battery packs? If so what amperage??
Thanks again - much appreciated.
I use the connectors that @hangloose made. It uses 6mm bullet connectors in a 3d printed housing and filled with epoxy and 3d print a mold to make a gasket out of 2 part silicone. It might be a bit bulky for what you are trying to do.
The plugs are XT150. They are extremely strong with peak curret up to150A.
At moment I’using them just with dielectric grease in the water.
I’ll design a seal soon
So interesting to see their build using MT60’s and fairly low AWG wire. I’m sure they’ve tested the limits in and out of the market. Wonder how close to the limits this pushes things. Very tempted to follow this honestly for a low stress foil assist build. It would certainly make a through-board connection a lot easier. Hmmm…
Yeah I was thinking the same. I did chat about this with a friend who is an engineer and he said it was possible because of it being underwater… it keeps things cool and allows it to handle the current.
I am also trying to figure out a good waterproof solution to passing a cable through.
Was thinking of just passing wire through, with no plug, and moulding resin or sealant around it both sides of the container, maybe with 3D printed surrounds.
Do we know what gauge wire they’re using for the 3 conductor cable up to the ESC? Seems the motor comes with 12AWG but I could swear I saw someone/somewhere mentioning 14AWG?
My friend who knows this stuff well says the following:
2.5mm2 (AWG 14) wire will be OK as long as it is short (<500mm) and we don’t put it on full power very long out of the water. The “power factor” for this cable/scenario suggests 250-300mm is ideal. And, yes, I just had to google what power factor is… indeed it’s the thing we should be calculating here
Using the larger 4mm2 wire (AWG 12) at those short lengths… you would need to remove the capacitors (I’m assuming he means on the ESC) as it would be too low resistance.
I don’t agree on removing the capacitors, they are on the battery side and needed. It never hurts to use a thicker cable, reduces loss and risk of overheating. It’s a compromise between weight/size and heat/loss. The cable should also match the connector, it doesn’t help to use a large cable on a small connector that overheats and de-solders itself.
Several MT 60 connectors along the route to the ESC, combined with a small cross-section wire, greatly increase your chances of getting a de-soldered phase wire.
vs