Does a Schulze 18.97kw have a lvc?

[BrianG]

Maybe it's because it was a simple matter to adjust the NiMH firmware the way they did?

[lincpimp]

Originally Posted by BrianG

Maybe it's because it was a simple matter to adjust the NiMH firmware the way they did?

Likely. I just cannot understand why someone would want to run an expensive truck, with a 1527, good lipos and then use an outdated, featureless charger... Blinky balancer too, so that will not do anything to protect the pack if the charger messes up.

He also runs a schultze esc and some off brand lvc. I can see why he is having lipo issues, bet the pack ran down below 3v per cell, then he tried to charge it and it saw the low voltage as a 5s pack, and charged it as that. Plus that esc is only rated to 5s by the mfg, not 6s. Like pushing water up a wall...

[MetalMan]

Originally Posted by lincpimp

Interesting, so there is room for some error in determining the cell count. Thanks for that info dude!

Any time

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?

The circuit is really good at cutting the pulse right when 4.20v/cell is reached, but you're right, it is a really cheesy way to complete a Lipo charge. In fact, I often perform a manual CV phase when I charge with my 109.

Originally Posted by BrianG

Maybe it's because it was a simple matter to adjust the NiMH firmware the way they did?

This would be my guess. The AF109 is a pretty old charger, and aside from a SMD conversion (used to be thru-hole) and new software chips (single item with the charging algorithm store on it) it's likely the same charger as one of AF's old NiCd chargers.

Originally Posted by lincpimp

Likely. I just cannot understand why someone would want to run an expensive truck, with a 1527, good lipos and then use an outdated, featureless charger... Blinky balancer too, so that will not do anything to protect the pack if the charger messes up.

He also runs a schultze esc and some off brand lvc. I can see why he is having lipo issues, bet the pack ran down below 3v per cell, then he tried to charge it and it saw the low voltage as a 5s pack, and charged it as that. Plus that esc is only rated to 5s by the mfg, not 6s. Like pushing water up a wall...

Tell him to invest in some new technology... IE drop the Schulze and AF109.

[lincpimp]

Originally Posted by MetalMan

Tell him to invest in some new technology... IE drop the Schulze and AF109.

Yeah right... Would be like trying to push water up a wall. That is his best bet though. Just annoying that I have to fool with a pack that was most likely damaged by incorrect use. Oh well, just how it is.