Figure 1 shows a domestic battery storage unit connected to a solar panel system.
The battery storage unit has a rechargeable battery pack to store electric energy for a household.

The rechargeable battery operates at a potential difference of 400 V and can store up to 48 MJ48\text{ MJ}48 MJ of electrical energy.
It takes 6 hours6\text{ hours}6 hours for the battery to receive a full charge.
Assume that the charging process is 100% efficient.
Calculate the total charge that flows while the battery is being charged.