What happens if you use the Dell 30-Watt AC Adapter with 3 ft Power Cord - USB Type-C to charge the HP Chromebook 13 G1?
Using software from Granite River Labs, we can see that the Dell 30-Watt AC Adapter with 3 ft Power Cord - USB Type-C first offers 5 volts @ 3 amps (15 watts), 12 volts @ 2 amps (24 watts), and 20 volts @ 1.5 amps (30 watts) to the HP Chromebook 13 G1.
The HP Chromebook 13 G1 first requests 5 volts @ 3 amps from the Dell 30-Watt AC Adapter with 3 ft Power Cord - USB Type-C.
After the Dell 30-Watt AC Adapter with 3 ft Power Cord - USB Type-C provides this 15 watts of power to the HP Chromebook 13 G1, the HP Chromebook 13 G1 then requests 20 volts @ 1.5 amps (30 watts) allowing it to charge much faster.