Hi bee_utey, that is a very clever idea but I suspect that device is not large enough, both in the heatsink size and the current capacity.
The unit is designed as a bridge rectifier and as such is actually only capable of handling 100 amps pre diode for a very short time during each AC phase cycle.
To do what is required in this situation, even with an 80 amp draw, the diodes will need to handle a continuos forward current load of 40 amps, and dissipate a hell of a lot of heat.
Furthermore, the connection tabs are WAY too small.
A 200 or better still, a 300 amp version, if available, would be much better and you could still set it up the way you described.
Again, a very clever idea.

