I would also round it down rather than up.....
My tp3200&3300 would need 17+ amps to 18amps....
My tp4200 would need about 23amps....
The tp5300 would need about 29amps...
Past 5300 mah to 7200mah you'll need more than 30amps, which my tp1430C can't do........... I'll need a higher amp power Supply to charge over 23amps , but will probably pass on the benefits and save a few bucks....