What voltage should a 24v controller shut off at?

[Geebee]

What voltage should a 24v controller shut off at?
My Tonxing controller shuts off power at a bit above 23.5v and it is annoying the cr.p out of me because it means I can only pull 3~4 ah out of the 18 ah pack as after that pulling 13.6 amps on long hills sags the voltage too low.

[Ypedal]

20 v should be the right setting. but 24's gonna be a problem.. can you add an extra 6v booster pack to keep things going ?

[Freddyflatfoot]

GeeBee,
My 24 volt controller shuts off at 21.5 volts.
Cutoff should be at, or higher than the lowest per cell voltage, but 23.5 seems way too high! (i.e. 1.75v per cell for SLA's = 21.0 volts)
My pack often sags to mid 22's, and does go lower as the capacity gets lower.
Rob

[dirty_d]

my 48V controller shuts off at 31V i think, that ridiculous, by the time my batteries are 47V i can barely move.

[Ypedal]

NIcad/NImh = 1v per cell

SLA = 10-11v per cell under load

so
24v pack = 20v cutoff

36v pack = 30v cutoff

48v pack = 40v cutoff



Edit to add :

Many " 48v controllers " are simply 36v units run at higher voltage, so the LVC ( low voltage cutoff ) will still be set for a 36v pack.

You really want to avoid draining ANY battery pack to the cutoff point tho. no matter what chemistry, it's always best to keep a certain percent buffer.