For $1500 all i can think of would be a
1) MPP brand, all in one, 2000 to 3000 watt version.
2) Any used cheap 24V, 60 cell solar panel above 300 Watts, ( about $100) wich will be cheaper that 2 or 3 100W panels.
3) Should have about $1000 left.
This is the hard part, you may get a 24V 100AH...