Sorry to throw so much info 'late' in the process...
Those batteries sound too large for a beginning PV install, and just right if you can exercise them; you might find a gas or diesel generator is needed. Your battery is designed around a usage model of the 8-hour workday for discharge and 16-hours to cool/recover/recharge/cool, deka specs are listed as 6-hour discharge so add 15-20% to that capacity to compare other brands equivalent 20 hour rate (usual advertised rates).
If you get these batteries here is your bible for them:
http://www.eastpenn-deka.com/assets/base/0656.pdf
Those motive power batteries are meant to be worked hard, Deka says "Proper charging is essential for maximum battery life. In general, the proper charging rate for lead-acid batteries is any rate which doesn't produce temperature higher than 115°F (46°C), and any rate which doesn't cause excessive gassing."
A very interesting excerpt from Deka's PDF...
The charger delivers a "high" start rate of 20-23 amps per 100 A.H. of rated capacity. As the voltage rises to 2.37 volts @ 77°F (25°C) per cell, the gassing voltage of the battery is held constant until the charge rate tapers down to 4-5 amps per 100 A.H. This finish rate is held constant until the charger automatically shuts off. Charger start rates should not be more than 23 amps per 100 A.H. of rated capacity, and the finish rates not less that 4-5 amps per 100 A.H. @ 2.55 V.P.C.
The Outback MX-60 at 14.7V will produce around 50 amps with the maximum recommended NEC 750 watt solar array; if you have the 510AH bank the Dekka PDF calls for 100A minimum initial charging current, and enough charging time on their charge profile the electrolyte mixes thoroughly while the batteries are bubbling to avoid sulfation. Weekly equalizing will be very necessary, using solar alone may not make it.
I don't know your system specifics, but instead of the MPPT MX-60 why not a good used Xantrex RV series inverter/charger? They have built in 100/120/140A 3-stage chargers that you can attach a generator to for equalizing and sunless weeks; and take the money that would've gone to the MPPT and get another solar panel? Buying a 12V bank sure limits available resources once you get to such a large 500AH+ banks...