i had seen some kind of avalon2 400g use 2 1000w psu
so, i believe avalon1 can use 2 psu
its a relatively different system. heres what you need to check/know:
How does the power get from the PSU to the chips? If each module has individual power connectors that dont link to one another via the control board, you can use multiple PSUs to power the different modules.
But if the power DOES to the control board, THEN the modules - using 2 power supplies will eventually (probably within minutes or hours) destroy one or both supplies (possibly causing shorts and fires)