The InvisQi charger is certainly compatible with the iPhone 12 MagSafe but requires a smaller distance to charge. We recommend affixing the InvisQi charger to a surface with thickness of between 18-20mm (0.71-0.8”) rather than 30mm (1.2”).
The iPhone 12 charging times will differ greatly based on the size of the camera module, the positioning accuracy and the additional MagSafe Case use. If the battery level exceeds 80 per cent due to battery and device limitations set by Apple, all iPhone 12 models enter a slower charging mode. Even after a complete overnight charge, a combination of these conditions may result in iPhone 12 devices not being completely charged to 100%. Please charge without a MagSafe case for the better charging results, as this further increases magnetic interference and charging time.
Support.Apple.com states the following:
“When charging a non-MagSafe Qi-compatible device with a MagSafe Charger, power is reduced and charge times may be slower than on a typical Qi charger. If your iPhone is connected to both a MagSafe Charger and power via a Lightning port, your iPhone will charge via the Lightning connector. As with other wireless chargers, your iPhone or MagSafe Charger might get slightly warmer while your iPhone charges. To extend the lifespan of your battery, if the battery gets too warm, software might limit charging above 80 percent.”