Lipos puffing on a conservative setup, what gives

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  • Skullcracken
    Senior Member
    • May 2010
    • 617

    #1

    Lipos puffing on a conservative setup, what gives

    I have a Dr pirate 35 inch, with a typical setup, 4082 1600kv on 6s. Using an x445 prop. Runs great seems effortless, but last two outings puffed two turnigy 3s 5000 40c lipos severely, enough to split the blue casing. Ran again with two new turnigy's 3s 5000 4pc lipos, one looked brand new, the other was puffed out, and the label peeled up from the heat. Ruined. Any reason this is happenening on a moderate setup? I see guys run 4082 2200kv on 6s and I'm running a 1600kv...
  • 785boats
    Wet Track Racing
    • Nov 2008
    • 3169

    #2
    I would venture a guess & say that you are running the batteries down too far by running for too long.
    What were the cell voltages after the run?
    See the danger. THEN DO IT ANYWAY!!!
    http://forums.offshoreelectrics.com/...hp?albumid=319
    http://forums.offshoreelectrics.com/...hp?albumid=320

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    • Fluid
      Fast and Furious
      • Apr 2007
      • 8012

      #3
      I'm not so sure how 'moderate' that setup is, IMO too high a Kv and too small of a prop to be optimum for a boat that size. Be that as it may, Paul's assessment could be good too. What ESC?


      .
      ERROR 403 - This is not the page you are looking for

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      • Jamey
        Senior Member
        • Apr 2015
        • 199

        #4
        785boats is onto the right track! I would guess max wot run time should only be about 2 minutes tops, maybe less?

        Maybe it is just me but I personally don't call 1600kv on 6s as conservative especially in a mono. Granted it isn't a super hot saw set up of course but it is far from being "conservative". If the boat is running wet it will draw some decent amps. Think ~1250kv as conservative. That boat has enough room for 6s2p, you might look into doing that. 8000 to 10,000 mah total will definitely help run time and battery life.

        Comment

        • StevenBryant
          Senior Member
          • Nov 2012
          • 359

          #5
          I run a very similar setup with turnigy 5000mah cells on a M445 or M545 and have never had problems with the cells, I personally think you have been running the cells down too low or you have problem with your motor.


          Sent from my iPhone using Tapatalk

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          • JimClark
            Fast Electric Addict!
            • Apr 2007
            • 5907

            #6
            So then what is your runtime?
            "Our society strives to avoid any possibility of offending anyone except God.
            Billy Graham

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            • Brushless55
              Creator
              • Oct 2008
              • 9488

              #7
              Did you measure your cell voltages after they rested some ?
              .NAMBA20...Caterpillar UL-1, P-Spec OM29, P-Mono DF33, P-Spec JAE, Aussie 33" Hydro-LSH, Sprintcat CC2028 on 8s, PT SS45 Q Hydro, PS295 UL-1 power, OSE Brothers Outlaw QMono 4-sale, Rio 51z CC2028 on 8s

              Comment

              • Skullcracken
                Senior Member
                • May 2010
                • 617

                #8
                This was definitely a longer run, 5 min. But mid speed, a few fast passes. But this thing has baked 2 lipos in about 2 minutes before. Perhaps 2 3s in series is no bueno?

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                • Skullcracken
                  Senior Member
                  • May 2010
                  • 617

                  #9
                  Meant to refer to it as a moderate setup. But I've seen guys run 6s on 2200kv which I think is way too much, but I end up the one baking bread in the battery trays.

                  Comment

                  • Skullcracken
                    Senior Member
                    • May 2010
                    • 617

                    #10
                    Turnigy 180amp

                    Comment

                    • Skullcracken
                      Senior Member
                      • May 2010
                      • 617

                      #11
                      Maybe too long of a run. On the charger was down to 11.34v to start new charge on the non damaged lipo

                      Comment

                      • Tamelesstgr
                        Fast Electric Addict!
                        • Jun 2014
                        • 1516

                        #12
                        Those 40C packs can support 200 amps with the 5000mah rating. I will be running the Leopard 4082 with 1450kv on 6s, I will be ordering 60c packs from Revolectric. Is your motor a Leopard 4082 or another brand? Any specs on the motor wattage, max amp draw, etc?
                        NEVER SATISFIED RACING
                        Fine Design 32 V-Hull 4082+6s

                        Comment

                        • Brushless55
                          Creator
                          • Oct 2008
                          • 9488

                          #13
                          Originally posted by Skullcracken
                          This was definitely a longer run, 5 min. But mid speed, a few fast passes. But this thing has baked 2 lipos in about 2 minutes before. Perhaps 2 3s in series is no bueno?
                          there is your answer
                          .NAMBA20...Caterpillar UL-1, P-Spec OM29, P-Mono DF33, P-Spec JAE, Aussie 33" Hydro-LSH, Sprintcat CC2028 on 8s, PT SS45 Q Hydro, PS295 UL-1 power, OSE Brothers Outlaw QMono 4-sale, Rio 51z CC2028 on 8s

                          Comment

                          • NativePaul
                            Greased Weasel
                            • Feb 2008
                            • 2760

                            #14
                            Running 2x 3s packs in series as a 6s pack does work, plenty of people do it. what connectors do you use, it is possible that too small a connector is heating the wire and the tabs up too much. If that 11.35v is for a single 3s pack, not a surviving pair in series for 6s then that is near 3.8v/cell or about half full, so it wasn't overdischarged, did the pair start off at the same state of charge? Did you use the same charger for both? Were they a matching batteries of the same capacity and C rate? If so the other wont have been overdischarged either. All that is left is that it was pulling to many amps, is your drivetrain free and well lubricated during a run? Do the motor bearings feel OK? Is the boat running loose or wet? Where is your prop in relation to the hull bottom? How sharp is the prop?
                            Paul Upton-Taylor, Greased Weasel Racing.

                            Comment

                            • Doby
                              KANADA RULES!
                              • Apr 2007
                              • 7280

                              #15
                              You should be running 6S2P
                              Grand River Marine Modellers
                              https://www.facebook.com/search/top/...ne%20modellers

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