In the shown setup Batbox will get 16 packets of 32EU. One packet would be stored, other discarded.
The better suggestion would be to emit RS signal with strenght, proportional to stored charge. In 1.5 of course.
Batbox will actually get 4 packets of 32 EU per tick because LV transformer can only handle one MV packet, everything else is stored inside transformers buffer until it has a place to go.
For example :
MFSU emits a HV packet of 512 EU which goes to a MV transformer which tries to emit 4 MV packets to a LV transformer, but it only accepts one MV packet, other three MV packets gets stored in the MV transformer waiting for the LV transformer to send the first MV packet.
After 4 ticks MV transformer buffer will be empty, LV transformer successfully sent 16 LV packets (assuming it has a place to go) and MFSU will send another HV packet, resetting the whole process.
Tick one :
MFSU (Send one HV packet) -> MV trans (Have 3 stored MV packets) -> LV trans (Output 4 LV packets) -> Batbox (receives 4 LV packets)
Tick two :
MFSU (do nothing) -> MV trans (Have 2 stored MV packets) -> LV trans (Output 4 LV packets) -> Batbox (receives 4 LV packets)
Tick three :
MFSU (do nothing) -> MV trans (Have 1 stored MV packets) -> LV trans (Output 4 LV packets) -> Batbox (receives 4 LV packets)
Tick four :
MFSU (do nothing) -> MV trans (Have 0 stored MV packets) -> LV trans (Output 4 LV packets) -> Batbox (receives 4 LV packets)
Tick five (same as one, the process starts again) :
MFSU (Send one HV packet) -> MV trans (Have 3 stored MV packets) -> LV trans (Output 4 LV packets) -> Batbox (receives 4 LV packets)
...