Does a Schulze 18.97kw have a lvc?

[MetalMan]

The 109 uses a total of three stages to charge the battery.

1. Charges at half the rate selected (so if you set it at 5.0amps it will actually be charging at 2.5amps). This goes on for two minutes, at which point it determines the cell count by the voltage it reads from the battery. This is a crucial point because it is the only point where the cell count could wrongly be selected. However, anything less than 7s should not pose an issue to cell count selection unless it was discharged excessively prior to charging.

2. CC phase, charges at the selected rate. Cell count is locked in.

3. This is where it gets weird - instead of a CV phase, the 109 pulses the selected current to keep the voltage as close to 4.20v/cell as possible. The pulses become shorter and shorter as the pack nears 100% charge.

[BrianG]

Originally Posted by MetalMan

...3. This is where it gets weird - instead of a CV phase, the 109 pulses the selected current to keep the voltage as close to 4.20v/cell as possible. The pulses become shorter and shorter as the pack nears 100% charge.

Wow, sounds like a cheap/easy way to achieve a sort of CV. Really, how much more CPU would it have taken to do a true CV (or at least an adaptive CV)? Besides, even though the pulses are short, I'm sure there are still some hefty instantaneous currents before the circuit "realizes" the voltage is too high.

On a related note, don't some battery manufacturers specifically not allow pulse chargers?

[lincpimp]

Originally Posted by BrianG

Wow, sounds like a cheap/easy way to achieve a sort of CV. Really, how much more CPU would it have taken to do a true CV (or at least an adaptive CV)? Besides, even though the pulses are short, I'm sure there are still some hefty instantaneous currents before the circuit "realizes" the voltage is too high.

On a related note, don't some battery manufacturers specifically not allow pulse chargers?

Sounds like astro were not running on all 8 when they designed this charger...