Solar powered Low voltage lighting.

Its all in the math. Well, and the pocket book.
1000 watts at 12 vdc equals 84 amps.
Wow! You could just about weld steel with that.
In south Florida you get an average of around 5 to 6 hours of equivalent full rated charge from a PV module annually.
So, 1000 watts divided by 5 equals nothing less than a 200 watt PV array. More would be better! Say a 400 watt PV array.
As for battery storage. We know that a minimum of 83 amps per hour is needed. If lights burn for a yearly average of 10 hours per night then we have a minimum battery capacity of 830 amp hours at 12 vdc.
At bare minimum 200 to 400 watt PV array, 830 to 1000 amp hours at 12 vdc battery bank.
Anything less than this and you will not be satisfied with the system. Of course if your on the grid then grid power can make up the slack. Don't skimp on the wire size though. As with any low voltage system including accent lighting do line loss calculations and when in doubt always go to the next size up.

Or you could just add the PV array with a grid tie inverter to your existing grid service. No battery replacement needed and you can add more PV array as time and or money allows. Just size the inverter for future expansion of course. Good hunting.

Thank you very much.