[obermd]

Regeneration is DC from the motors to the battery. Wall charging is AC. The on-board charging unit is fundamentally an AC to DC converter (rectifier).

 

[obermd]

I might be misreading, but it looks like you're saying the charger limits regen, but regen charges the battery using the electric motor and not the charger.

If you are high up a mountain with an empty battery you can "charge" much more than 3.6 kWh in an hour regenerating to the bottom.

On the flat during normal driving, regen doesn't amount to much at all. I do still like it on long declines (shift to L and set cruise control to maintain set speed).

Correct, regen bypasses the AC to DC rectifier and feeds directly to the battery. Max regen is somewhere around 50 KW. As for descending a mountain, I filled half my battery between the parking lot on top of Independence Pass and Aspen, CO, just by using cruise control, L and the regen paddles to maintain speed or slow down during the descent.