I am a big boy (~230lbs) living on a mountain. My 1000 watt electric hub powered by 78 18630 Lion batteries in 13 cells barely moves me level let alone up a hill (which was its intended purpose). I tested its current to find it only pulling ~6.7 amps on a wheel stand. Times 48v only gives me just under 322 watts. Did I get ripped off? Is there something I am missing? 

Under the circumstances I'm considering removing the rim and spokes, attaching a cog and connecting it (centered in the frame) into the existing chain/de-railer system, directly.

Suggestions anyone?