I will repost here what I put as a response in your other thread on this topic:
Which fuse did you blow and how many amps is it rated for? Perhaps it's a fuse in the battery to protect the cells? The specs for that inexpensive V-power battery say max 20amps continuous discharge and there may be a fuse in there to protect the pack. With a 1000 watt motor/controller, it would not be unusual for it to try and draw more than 20 amps when you are leaning on the throttle.
So..what is the amps rating on the fuses you are blowing (should be written on the fuse)? You are likely drawing more than that. When the wheel is in the air, there is little load and little current drawn. When it is actually on the ground and facing resistance, the current draw goes up (and even more when going uphill).
As above, according to the specs that pack is rated for 20 amps. They may have put a 20 amp fuse (or less) in there to protect it. All I can think of that you can do is put a higher rated fuse in and take the risk of over stressing the battery/BMS.
Bottom line - a "1000 watt" motor is hefty and needs amps to drive it.