Battery damage

[sprintkat]

Good morning got a question

when i hook up my 3s1p 5000 mah 20-30c discharge lipo batteries in series,,the battery that is hooked up to the positive side of the esc always burns up
completely destroying the battery after 2 min run time. i use a leopard 40-82 with a 100/150 esc that supposed to handle 6s lipo's. esc and motor stay cool to the touch. is it the esc not able to handle the voltage or is it something else. i hook up the jumper between the 2 batteries last, am i supposed to hook the positive to the esc last with the jumper already in place.
im confused

[lenny]

Need more info on the boat size and kind and setup,
And some pictures of the boat and setup would be great.

[JimClark]

Let's see your jumper

Sent from my MB611 using Tapatalk 2

[LiPo Power]

[sprintkat]

never mind ,, need help from a pro boater who runs fast electrics

[JimClark]

Humm last time i checked this was a Fast Electric board (Hence the name Offshore Electrics). Guess you don't want any help

[carlcisneros]

Please provide a picture of your battery/esc hook up if you would so folks
can see what might be the problem.

A ton of words can be miss-interpreted by a ton of folks.............

thanks

[LarrysDrifter]

Did you have a "pro boater" in mind? If so, you should pm him instead of asking openly in the forum. Then, you wouldnt have to be a dick to those that try to help.

[sprintkat]

How is a picture of my 29" sprintcat going to solve this problem. anyway--i thought it was a simple question. everyone knows that when u hook up 2 batteries in series the left batt positive goes to the
positive of the esc and the right side battery negative goes to the negative of the esc,,then u use a jumper to hook up the remaining positive and negative together. all my wires are 10 gauge and the connectors are 5.5 mm. the jumper is about 4 inches long with 5.5 mm connectors. tested with voltmeter, the two 2 in series = 22.2 volts
back to the question at hand--the esc says it will handle up to 6s lipo's. the esc is 100/150 with 2 cooling plates,1 top,1 bottom. motor and esc stay cool. ive also used the hk 180/300 and it did the same thing. why does it always burn up the battery hooked up to the positive side of the esc, the negative side stays cool. in other words, it drains the positive side battery to the point of melting within 1 minuets or less. ive put a throttle stop on my transmitter so it will not go into burst rate. esc has indicator led for burst rate.
Its a 29" sprintcat with a leopard 40-82 motor,100/150 esc, 2x 5000 mah 20-30c discharge batteries, .187 flex drive using an octura x440, aeromarine hardware
in paralell, it runs fine, about 40 mph. in series for 1st minuete runs 60+ mph, then slows down amd thats when i bring it in and check everything to find the battery on the positive side has melted and swelled up. does anyone know what is causing this

[Fluid]

Yes, I do know. You are over-discharging your packs. What is the Kv of the motor - "Leopard 40-82" tells us nothing useful. Your batteries are clearly inadequate, by their specs they can only supply 100 amps continuous, but if they are cheap packs they may not be labeled "correctly". Running in parallel helps in two ways - it vastly reduced the amp draw and gives twice the safe discharge capacity (200 amps). You will either have to buy better batteries, run 2P, or get a more suitable motor.

You "thought it was a simple question" but you don't know the answer so how could you know if it was simple or not? The next time someone asks for more information, either give it to them or leave the board and ask your questions elsewhere. We are free with information once we know the whole situation, without that we can't be certain of someone's real problem.




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[LiPo Power]

I am not sure why use jumper???
If you are using 5.5mm connectors all over than you lost me on the reason of using jumper.
On my picture you will see simple set up in series using 5.5mm connectors..
Get rid of the resistor-jumper. Than will go from there....
Later try nano-tech lipos 40C or more... Maybe your set up is sucking more juice than your 20-30 lipos can produce. They are legging behind and one of them keeps saying
heck with this, I give up!!!
I am also with Fluid on setting it up as P configuration... Works like a magic!
Post some pictures please.... We would like to see your boat....

[sprintkat]

the leopard 40-82 is a 1600 kv motor. if the motor max amp draw is a 120 amp (per specs) and i have 100 amps in the battery at my disposal, how am i over discharging the battery. isnt it supposed to draw from both batteries at the same time. it seems to be drawing from the battery on the positive side of the esc 1st . ok --what batteries and at what discharge rate and how many mah's would u suggest.

[LiPo Power]

40C plus!!!
also max draw is only on the paper....
When the prop gets out of the water and than back in the water getting hit with full load your amp draw can go to the roof this very moment....
If motor is rated max at 120 amp your ESC should be 180Amp and your battery set up shoud be able to squeez 130plus amps...or more, why not....
It sounds to me you are right on the edge.... Give yourself a little margin here and there....

[sprintkat]

ok - so if i got 2 x 3s1p at 5000 mah witha 40c discharge rate in paralell ,, isnt that 400 amps of power.