The info I have is:
The 1717 seems to be 2000Watts (4000w surge).
The 1515 is 1250W (2500w surge).
The 1518 is 1500W (3000 surge).
The 1520 is 1750W (3500W surge).
Anyone with info on temps and run time on 4S Truggy Geared to 40mph - is welcome :-)