Huge difference between esc temps and motor temps

[RuntheraceAMC]

I recently blew up my Raider 150 (my fault. Running way too many amps). I bought the ETTI 220a ProII and love this esc. It lays down the power. But.... My temps have me scratching my head.

My set up: DFE 36, Leo 4092 1730kv, 648 prop, batteries: 5s 1p 70c; 6s2p 45c, 6s1p 70c. COG is 10 inches from the transom. 33" from transom to tip.

On the raider I would see 110-125. Motor up to 110F

On the new esc.... 5s: motor 90F. Esc 140F. 6s: motor 105 esc 155-160

Could it be timing? I thought I had it at 2.5 but this esc is hard to program. Am I missing something?

[JimClark]

How long do you run? Or how much is left in the lips after a run?

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[RuntheraceAMC]

That's a 5 min run. Just sport running with half a dozen full throttle passes

[RuntheraceAMC]

I'm not sure what you mean by how much is left in the lipos after each run? I run them down to 3.2-3.3 per cell each time I use them

[JimClark]

That's a 5 min run. Just sport running with half a dozen full throttle passes

So you are you at low throttle a fair amount of time?

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[RuntheraceAMC]

No. Half to 3/4 throttle for half the passes and full or near full throttle for the other half for a solid 5 mins

[Fluid]

How many mAh do you put back in the packs after a run compared to the total pack capacity? We need to know more than 6S2P etc, we need to know the total mAh for each setup.

Are you timing the runs or just guessing? That alone could be the reason especially if there is a difference in pack capacity.


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[RuntheraceAMC]

My 5s and 6s packs are 5000 mah. I am putting 4600-4900 back in them each time I charge. On one or two occasions I have recharged them and it was over 5000 mah. My last run (when I noticed the abnormally high temps) it charged and it took 4800.

I also have two 6s packs I am running in parallel. 4100 each for 8200 total. I am recharging them 7200-8000 each time.

I don't time my runs. I quit when I notice a drop in performance.

[NativePaul]

Your packs wont last long treating them like that.
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[fweasel]

Your packs wont last long treating them like that

I agree. I set my LVC to 3.2V in my Zelos and my 3S packs usually read 3.55V when I bring the boat in after 3.5min. In my other two boats that don't draw as many amps, my packs come back closer to 3.7V after about 5min runs.

[TRUCKPULL]

My 5s and 6s packs are 5000 mah. I am putting 4600-4900 back in them each time I charge. On one or two occasions I have recharged them and it was over 5000 mah. My last run (when I noticed the abnormally high temps) it charged and it took 4800.

I also have two 6s packs I am running in parallel. 4100 each for 8200 total. I am recharging them 7200-8000 each time.

I don't time my runs. I quit when I notice a drop in performance.

A 5000 pack -- Recharging to 4800
This means that you are running your packs down to 4%

6S 2P 8200 packs --- Recharging to 8000
This means that you are running your packs down to 2 1/2%

These numbers are way too low.
You will start seeing the magic smoke if you keep this up.
You could be causing a lot of extra heat when the voltage drops.

The old rule for LiPo's for them to last for a good number of cycles is ;
Never charge over 98% and Never discharge below 20%

I run 2P setups of 10,000 total for racing.
My run times are about 2 min.
My packs are usually down to about 45%

My suggestion to you would do some testing; run 2 min. recharge to see what you got left.
Try again at 2 1/2 or maybe 3 min.
When you find your right point, then always time your runs.

Larry

[RuntheraceAMC]

As you can tell.... I had no idea

[srislash]

It's a learning curve. After awhile you just kinda get used to a 'time'. But run a timer, it will save you money in the long run. Run two sets of packs to get your fill, it is better than running one set and killing it in months, or less.

[Fluid]

The OP's temperatures are higher with the 6S2P setup because they ran a lot longer before they hit the LVC. As mentioned above, running the packs so low will shorten their lives and performance as well as heating everything up.


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[785boats]

RuntheraceDMC
Keep a copy of this chart handy. Time your runs. Check your cell voltages after each run, & compare them with the chart to see where you're at with run time & discharge.

Lipoly Voltage vs. State of Charge 2S - 6S Packs.JPG

fweasle.
As you see on the chart, at 3.55v, you are seriously overdischarging your packs.
Resting voltage after a run should be above 3.7v/cell.
I'd raise your cutoff setting a bit to prolong the life of your packs.