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The main question that no one asked is how long is the wiring? How far away from the main breaker. If it’s a short distance then upgrading the wire will not be a big deal or cost.
What do you mean "Power" the ipad? It will definitely charge it. It may charge slower than on a home charger, but it will DEFINITELY charge it at some speed.
This site is similar to wires and cables your way but cheaper prices.
https://nassaunationalcable.com/collections/all/products/4-thhn-thwn-2-stranded-copper-building-wire