Lowest cut off for a Luna 52 v 13.5 ah

[tony234]

I was wondering if anybody knew the lowest voltage you could go for a cut off On a Luna 52 V Wolfpack. Some say 46!!??( which is a little high right? Some say 41, and even 39 v .

 

[harryS]

A 52V pack is 14 series groups. Let's say the lowest safe voltage is 3V/cell. that gives you 3 x 14 = 42V.

There are two low voltage cutoffs to consider. One in bike controller and one in battery, Ebike controllers usually set a higher LVC than what a battery BMS will set. Many 48V controllers will run on 52V packs, but their internal low voltage cutoffs remain set for a 48V pack, around 40V.

That's a little too low for a 52V pack. If you can adjust the controller LVC via settings, it's a good idea to do so. I set mine to 43V. Can't go any higher or I would. There's not much left in a 52V pack when it gets down to 45V.

 

[tony234]

A 52V pack is 14 series groups. Let's say the lowest safe voltage is 3V/cell. that gives you 3 x 14 = 42V.

There are two low voltage cutoffs to consider. One in bike controller and one in battery, Ebike controllers usually set a higher LVC than what a battery BMS will set. Many 48V controllers will run on 52V packs, but their internal low voltage cutoffs remain set for a 48V pack, around 40V.

That's a little too low for a 52V pack. If you can adjust the controller LVC via settings, it's a good idea to do so. I set mine to 43V. Can't go any higher or I would. There's not much left in a 52V pack when it gets down to 45V.

Thank you very much for this information man!!I really appreciate it!

 

[smorgasbord]

To the OP - if you bought the battery from Luna you should ask them.

On my 52Volt Apollo, the Bafang Ultra motor is programmed with a "Low Battery Protect" at 38 volts. That probably compensates for sag (which is a lowering of the measured voltage when the battery is under load).

 

[tony234]

You’re probably right I’ll definitely give them a message for sure! I do appreciate all the input. I’m having a blast using this set up.