Well ya know, us florida crackers ain't got much o them technical minds to wrap round such equashuns
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Originally posted by sailr View PostMaybe 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)
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sounds like your LVC is wackedOriginally posted by crabstick View PostI 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).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
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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
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Yeah, sounds more like a bad ESC than a battery problem.Mini Cat Racing USA
www.minicatracingusa.com
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Originally posted by sailr View PostYeah, 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
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agreed, and isnt that what its built to do?Originally posted by Rumdog View PostYep, 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.
.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
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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.
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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
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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, 02:29 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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