Running a 2A powerplant in a size 3 slot? I don't recommend this. Get the highest powerplant you can afford to reduce heat buildup since the better powerplants are better at disapating heat. Also, NEVER start FSD charge while you are in the star's corona. This applies to all ships, not just the T6.
As others have said.. a 2A and a #a are the same in heat efficiency
with the 2a you are only using 75% power for a standard cargo haul build
2A 75% usage 19.61ly jump cost $160 224
3A 60% usage 19.53ly jump cost $507 912
basicaly your paying 3 times as much to jump less distance, use more fuel ( per weight) and have even more energy that u wont use
You can even shove in 2 A class shield boosters on with the 2A pp, and just tick 100% usage with the cargo hatch disabled.
it could also be argued that the 3a power distro i ran in it wasnt needed,but the ability to pretty much spam boost means theres no point to fighting an interdiction submit/spam boost/jump and rofl