Help with dropping 20 volts for 8kw AC or DC

The project I am building needs to turn 120 volts AC into 100 volts DC while being able to withstand 8 kw of current. I already have a 10 kw bridge rectifier. The 20 volt reduction could happen before the rectifier by using a transformer or after the rectifier using a voltage divider circuit (using two resistors). The problem is, either one of those options is not possible due to cost. Transformers in that power range are extremely expensive and even 1 kw resistors are $70 each at best from what I could find. Does anyone have any other ideas on how to drop those 20 volts? I have plenty of area for this project, so I was even thinking of some thick wire run for a distance or maybe some pieces of graphite from the art store to create a crude voltage divider. I have thought of different cooling methods that would need to be employed using water, oil, or fans. Finally, I was thinking that furnace heating element resistive wire might work in place of resistors in the divider circuit. I think it can handle 220 volts at 800 watts (of course multiple strands would have to be paralleled), but I think that would be better for lowering the amount of current available instead of lowering the voltage.
Thanks in advance for any ideas.

 

Yes, it's 80 amps - I though that was obvious from my post. Ripple is not important for my project and I would have stated so if it was. I was simply trying to see what other options are out there for reducing voltage. And yes, the bridge rectifier I have was not rated in kilowatts but I was stating that for simplicity - my bridge rectifier is 100 amps at 120 volts if you need me to be simplistic about it. I have no idea where you get 170 volts - I'm trying to go from 120 volts to 100 volts.

 

This is the problem with the internet today. I remember in the 90's when if someone had an idea outside the mainstream it was encouraged, not derided. Now days it's more likely to have someone try to make you look foolish to make themselves look superior than to have someone offer help. Never mind, I'll find the answer myself as I always do.