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  • sailr
    Fast Electric Addict!
    • Nov 2007
    • 6927

    #16
    Well ya know, us florida crackers ain't got much o them technical minds to wrap round such equashuns
    Mini Cat Racing USA
    www.minicatracingusa.com

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    • crabstick
      Senior Member
      • Jul 2008
      • 954

      #17
      Originally posted by sailr
      Maybe I read it wrong. I thought he was saying the voltage was going to drop quicker. Still not sure why you would set the LVC that high.

      I have experienced an issue once where I was drawing so many amps, the LVC didn't cut in right away and I got to about 2.7v per cell then it cut in all of a sudden..... Not sure if this is what the poster meant?

      (kb45 1700kv with an X450 prop and 4s)
      Matt.
      FE, Nitro and Gas racing in Auckland
      www.rcboats.co.nz

      Comment

      • Brushless55
        Creator
        • Oct 2008
        • 9488

        #18
        Originally posted by crabstick
        I have experienced an issue once where I was drawing so many amps, the LVC didn't cut in right away and I got to about 2.7v per cell then it cut in all of a sudden..... Not sure if this is what the poster meant?

        (kb45 1700kv with an X450 prop and 4s)
        sounds like your LVC is wacked
        .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

        • sailr
          Fast Electric Addict!
          • Nov 2007
          • 6927

          #19
          hmmm, maybe! I've never experienced that. But with the higher C ratings, that should allow more amp draw and help prevent it I would think.
          Mini Cat Racing USA
          www.minicatracingusa.com

          Comment

          • sailr
            Fast Electric Addict!
            • Nov 2007
            • 6927

            #20
            Yeah, sounds more like a bad ESC than a battery problem.
            Mini Cat Racing USA
            www.minicatracingusa.com

            Comment

            • Brushless55
              Creator
              • Oct 2008
              • 9488

              #21
              Originally posted by sailr
              Yeah, sounds more like a bad ESC than a battery problem.
              .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

              • Rumdog
                Fast Electric Addict!
                • Mar 2009
                • 6453

                #22
                Yep, also the only real reason the lvc would kick in early is if the cells can't [rovde the needed amps. Voltage drops, LVC kicks in.

                Comment

                • Brushless55
                  Creator
                  • Oct 2008
                  • 9488

                  #23
                  Originally posted by Rumdog
                  Yep, also the only real reason the lvc would kick in early is if the cells can't [rovde the needed amps. Voltage drops, LVC kicks in.
                  agreed, and isnt that what its built to do?
                  .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

                  • Rumdog
                    Fast Electric Addict!
                    • Mar 2009
                    • 6453

                    #24
                    Man, do I need a spell check.

                    Comment

                    • crabstick
                      Senior Member
                      • Jul 2008
                      • 954

                      #25
                      ESC is still fine, and LVC cuts in nicely when im not trying to draw stupid amounts of amps from it... I just think on this particular occasion I drew too many amps, too quickly and the LVC didn't cut in right away.
                      Matt.
                      FE, Nitro and Gas racing in Auckland
                      www.rcboats.co.nz

                      Comment

                      • Brushless55
                        Creator
                        • Oct 2008
                        • 9488

                        #26
                        sounds like a battery issue
                        the LVC is built to save the batteries and if its not keeping up its not working right!
                        .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

                        • 785boats
                          Wet Track Racing
                          • Nov 2008
                          • 3169

                          #27
                          Sorry.
                          What I was trying to say is that they will hold the voltage higher under load & that if the LVC is set to say 3.0 V They will totally discharge their full capacity & sometimes even more before the voltage drops to the LVC & you've over discharged your battery as there will not be around the 20 % capacity left.
                          Even when set at 3.2V my 40C packs will have only about 10% or 15% left if I let them hit the LVC (which I try never to let happen)
                          So these Higher rated Packs WILL hold their voltage Higher for longer & the packs Will most probably over discharge before they hit an LVC of 3.2v or maybe even 3.4V Remember over discharged is with less than 20% capacity left in the pack.
                          I've put back 5480mah back in a 40C 5000mah pack once when I ran it until it hit a 3.0V LVC. A 20C pack wouldn't allow that to happen.
                          as its voltage would sag earlier.
                          As a rule I try to bring the boat in before I hit any LVC.
                          Hope this helps a bit.
                          Paul.
                          Last edited by 785boats; 06-29-2010, 03:29 PM.
                          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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