I have a query regarding the operation of my hub motor kit.
The battery is a 24V li-ion 6.8 Amp Hour. It has 7 cells in it and when it is fully charged my multimeter reads 29.0 V. (this would be 4.14V per cell).
The controller has 24V 15A stamped on it. It also has 20.8V on it. The rest of the writing is Chinese. I assume the 20.8V is the cutoff voltage.
Now, when I ride the bike till the motor cuts out the battery reads 26.4V (3.77V per cell).
What is happening here? I thought that the low voltage cut-off for li-ions would be about 3.0V or so (maybe less) which is to protect the battery from over-discharge.
Is my controller being very cautious and cutting the power well before this in order to preserve / extend battery life?
I have found that if I disconnect the battery and reconnect then I can get a little bit more distance out of it before it cuts out again.
Perhaps the reading taken when the battery is not under load is 26.4V but as soon as the load is applied the voltage plummets. Would this be correct?
I wonder if anyone can shed some light on this behaviour.
The battery is a 24V li-ion 6.8 Amp Hour. It has 7 cells in it and when it is fully charged my multimeter reads 29.0 V. (this would be 4.14V per cell).
The controller has 24V 15A stamped on it. It also has 20.8V on it. The rest of the writing is Chinese. I assume the 20.8V is the cutoff voltage.
Now, when I ride the bike till the motor cuts out the battery reads 26.4V (3.77V per cell).
What is happening here? I thought that the low voltage cut-off for li-ions would be about 3.0V or so (maybe less) which is to protect the battery from over-discharge.
Is my controller being very cautious and cutting the power well before this in order to preserve / extend battery life?
I have found that if I disconnect the battery and reconnect then I can get a little bit more distance out of it before it cuts out again.
Perhaps the reading taken when the battery is not under load is 26.4V but as soon as the load is applied the voltage plummets. Would this be correct?
I wonder if anyone can shed some light on this behaviour.