parallel batts and voltage cut off ?

[steveo]

my setup is 4s2p if both batterys are the same, then lets say one is weaker than the other the esc will not detect the weaker battery to shut down and still continue to draw from both batterys and may cause the weaker battery to fall below the recommended minimum voltage and damage it

is this correct, how could this be avoided

[sailr]

The esc is gonna shut down at where you have it set, regardless of the battery conditions. It is based on the total voltage coming out of your packs. So when the 4S hits 12V or wherever you have the cutoff set, the esc should shut down. If one pack is weak, and the voltage is lower, it will contribute to the total voltage of the packs. I don't think the esc is going to allow the bad pack to be damaged because regardless, it's the total voltage, not the voltage of each pack. If any of that makes sense! ;-)

[steveo]

but the both packs are 14volts in parallel i am not adding voltage together like in series, if you take a 4s batt at 12 volts to a meter and parallel a 4s pack 14 volts its gonna read 14 volts, the esc will read the highest voltage

[sailr]

Yes, you are right. I guess my explanation was a bit confusing. The LVC in the esc should still shut down at the correct point which should be high enough not to damage the weak pack.

[Fluid]

14 volts its gonna read 14 volts, the esc will read the highest voltage

No, the ESC will read the average voltage, just like a charger without a balancer does. If the weak pack is well under the voltage of the strong pack then the cutoff could be too low. But if the packs are within 0.2 volts of each other under load I wouldn't worry about it, especially if the cutoff is 14 volts.



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[Make-a-Wake]

No, the ESC will read the average voltage, just like a charger without a balancer does. If the weak pack is well under the voltage of the strong pack then the cutoff could be too low. But if the packs are within 0.2 volts of each other under load I wouldn't worry about it, especially if the cutoff is 14 volts.



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Correct. If you parallel a depleted batt with a full batt for example, the LVC wont kick in til the full batt is to the LVC.........by that time the depleted pack would be extremely low......maybe 2.5v per cell or something in there, and be ruined.

[steveo]

thanks again jay