This is a highly customized BugE kit we built for a customer who requested improved range, accelleration and top speeds beyond what the standard kit could deliver. It is street legal and capable of highway speeds.
We modifed the battery box to accept a 5kW LiFePo4 battery pack, a 400A adjustable DC controller and a reversable series wound motor so the driver has the convenience of "powered" reverse.
The on-board charger is a multi-stage 25Amp charger. Top-end balancing of the lithium cells is managed by on-cell regulators. The regulators also monitor the voltage of each cell, providing a signal to a circuit we designed to manage the charger or alert the driver any cell reaches an undesirable voltage. The cell monitors and the circuit together, perform the basic battery management system (BMS) functions.