In the Maggie's boot is the charge controller and charger as well as the batteries.  The batteries are in the trunk in two large aluminum boxes which we will discuss later.

I was initally confused by the terms "charging system" and the "charger".  Here we are discussin the the charger. The previous page discussed the charging system which plugs into house power.

The job of the charger is to receive the AC voltage from the charging system and convert it to DC, the current used in the batteries.

The charger is tjhe larger of the two boxes in the circle.  The charger controller is the small white what box which has the brains of charging the battery.