Interesting to see that in one of the online Ampera manuals, you can select various charging currents on one of the pages on the DIC, see below, like Paul said a useful function if trying to maximise solar panel output.
Charge level selection
The charge level preference setting allows the customer to select their vehicle’s charge level so it matches the capability of their charging location. If the vehicle consistently stops charging after plugging in, or if a circuit breaker continues to trip, reducing to a lower charge level preference may resolve the issue.
The charge level preference should be configured to match the electrical current rating for the AC outlet that the charge cord is connected to. The charge level preference settings are:
■ Maximum - 16 Amps: Limits AC current to 16 ampere
■ Reduced Level 1 - 12 Amps: Limits AC current to 12 ampere
■ Reduced Level 2 - 9 Amps: Limits AC current to 9 ampere
■ Reduced Level 3 - 6 Amps: Limits AC current to 6 ampere
Exact current levels for a particular region may vary from values shown in this manual. Please check vehicle for available levels.
The charge level preference settings are not directly related to the charge level button on the charge cord. The vehicle will adhere to the setting that minimises the AC current used to charge the vehicle.
The charge level preference setting will be retained between charging events. This setting should be referenced before charging to ensure that the vehicle is configured to properly match the electrical current rating for the AC outlet that the charge cord is connected to.
The charge level preference setting can be changed at any time while the Colour-Info-Display is operable.