High temperature

[ksaucerman]

I'm running a leopard 2150kv a turnigy 180amp esc, 2 35c 2s packs, 5.5 bullet motor connectors and 5.5 bullet battery connectors. Also running x642 prop. My battery connectors get up to 200 degrees and have melted the solder out of the bullet connectors a couple of times. Is this temp normal? Motor and esc never get above 105 degrees. Could the solder be bad or is there higher temperature solder. Used 60/40.

[bbosncali]

Wow that's pretty hot.... strange how the battery connectors get so hot but the rest of the electronics don't. The highest my connectors ever got was 120* and my motor and esc temps were around 105* and I'm using ec5 which are actually rated less for amp draw compared to the 5.5mm. I use computer solder which sems to work fine for me. Have you double checked to make sure nothing is loose or anything grounding out? Are your connectors completly seperate with no metal showing? Sometimes the electric current can jump but that usually will lead to a burnt up esc or batteries. Can you post a pic of your batteries fully connected in your boat with a nice close up of the connectors to esc

[ron1950]

if go out on a limb here and say your solder joints arent up to snuff

[ksaucerman]

would a bad solder job cause that much heat? I'm new to this just put on some ec5 connectors using silver solder and a torch maybe this will be able to handle the heat. I am just wondering why battery connectors would get that hot and nothing else? Sorry dont have digital camera to post pictures. Thanks for the help.

[bbosncali]

Make sure you tin the wire good use a little flux to draw the solder in and rpeat on bullets

[dana]

Dood I just went thru this. I have 2200kv seeking 180. Two 2s 40c packs running m445. Mine got the same temps even desoldering themselves. The fix? Two 4s packs. The motor is a power hog. The 2s packs can't deliver enough. My temps now are 120 bullets, 114 motor, motor bullets 140, and that's 7 minute run, not the 3 min I was getting on 2s packs.

[bbosncali]

There has to be another solution?? I ran 2 s pack for 4s and 2 3s packs fr 6s on 5 diferent motors 4074 2200kv 1512 1800kv 4074 2000kv 4082 1250kv and a 1518 1800 kv and mine never got above 120* at the connectors

[dana]

Hmmm... Well I can only say what happened to me with the same setup. Do you time your runs?

[LarrysDrifter]

Has anyone thought about checking wire temps? Compare wire temps to bullet temps. Typically, if the wire is not hotter than the bullets, then the bullets need to be upgraded to a larger size. Running a 2p setup like Dana has is also a big help. When checking temps, check the wire and the connectors. When checking the motor itself, check it at the end bell if there is no cap. You need to be able to touch or temp gun the motor shaft. If you cant do it by using the end bell, check it at the collet. I check mine at 3 different places and use the highest temp.
When checking esc's, check the caps, and as close to the board as you can.

[tiqueman]

I have the same issue on a P-mono boat. Everythign comes in about 125, but the 5.5 bullets were 170. I changed to larger bullets and it brought it down a little bit. Changing props brings it down a lot.

[ksaucerman]

Thanks for the input. I just talked to a guy at a hobby shop and he said that my 180 amp esc is trying to pull to many amps from my 35C batteries. He said I need higher C ratings for this setup does this make sense. Also if I turned my timing down would that help with the amps it is drawing?

[dana]

Keep your timing at 15degrees. 40c isn't even enough. When you run two 40c 4s packs parallel, you get 80c discharge. That's what it takes. Plus your mah is doubled. So even 4s 3000 mah packs will give you 6000mah and double the discharge rate

[LarrysDrifter]

I don't think parallel connecting packs increases c rating. I could be wrong, but I think that's what always stays a constant.

[dana]

Well why wouldnt it? Two 4s 40c packs only have to work half as hard as two 2s 40c packs

[dana]

I'm sure I've got it mixed up, but my point is.... Two 4s is better than two 2s packs for his setup