CARB in ARB/MSD/7-6-94 claims that the battery efficency is 80%.
This is a lie! When charged at a charging station for one hour it
would be
(80x100)/( 20 x8x8) +80)= 5.88%
While during discharge it depends on how many stops the motor
makes. Every time it starts it's efficiency is almost
ZERO!!
1 The leakage inductance cannot limit the starting
current because of the low frequency, which is also detrimental for
the battery because the current is so high!
2 The magnetizing branch of the motor shunts the
load current because of the low starting frequency. This also
increases the battery current supplied while starting.
3 The voltage drop across the inverter
semiconductors is comparable to the motor's because of the low
starting frequency.