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The iVoler 75W USB Type C Charger with Power Delivery (click here for Amazon pricing) offers USB Power Delivery charging for many types of mobile devices including certain Apple based products like the Apple iPad Pro (12.9").

During earlier testing we found that the iVoler charger could provide 12 watts over USB Power Delivery to the well charged Apple iPad Pro. Here we see how well they perform with a fully depleted battery on the iPad when connected with a Apple USB-C to Lightning Cable.  

We observe using the Granite River Labs GRL-USB-PD-A1 test software which repeatedly shows the iVoler 75W USB Type C Charger declaring initial USB Power Delivery profiles of 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps) and 45 watts (15 volts @ 3 amps) while waiting for the Apple iPad Pro to respond.

After a hard reset and the same power offering by iVoler, we can finally see the Apple iPad Pro makes its first request of 15 watts (5 volts @ 3 amps) and gets accepted.

The iVoler 75W USB Type C Charger goes on to initiate Discover Identity which the Apple iPad Pro complies. The iPad then takes this opportunity to request and establish the highest 45 watts (15 volts @ 3 amps) power contract to speed up charging with the iVoler charger.  

However, we can actually see that upon plugin from zero charge, the Apple iPad Pro initially pulls only around 0.4 amps at 5 volts when switched off. After 15 minutes, the iPad is turned on and after requesting 45 watts (15 volts @ 3 amps), it doesn't appear to pull any current as the voltage rises to 15 volts.

Unfortunately the Apple iPad Pro is not able to charge properly from a fully drained battery with the iVoler 75W USB Type C Charger with Power Delivery even after charging for some time before turning on the iPad.