60amp charge for 48v 270ah batt pack

As far as I know, there is no minimum charging current for LiFePO4 batteries... So the charger just needs to be large enough to recharge the bank as fast as you need... For your bank:

270 AH / 60 Amp charger = 4.5 hours to charge from 0-100% State of Charge

Unlike Lead acid batteries which typically do best with at least 10% rate of charge (i.e., 270 AH * 10% = 27 Amp "optimal" charging current for lead acid).

Also, you do need to monitor Li Ion per cell charging voltages to avoid over charging a cell. If you have a BMS, it may monitor per cell voltage and may even do cell balancing automatically (review BMS manual).

Of course you need to respect the maximum charging current for any battery type... Typically 25-50% max rate of charge for Lithium, and around 10-25% rate of charge for lead acid (lead acid batteries get hot at higher rates of charge and as they charge over 90% SoC--So you need to monitor bank temperature too to avoid overheating at high charge rates or during EQ charging).

-Bill