That should work.
I have a 24 volt dc buss in my house that is derived from 4 solar panels on the roof. I went with 24 volt because of the loss over the cable, because it's dc and needs a return path your 100m long cable is 200m long to the circuit. Using heavy gauge wire has lower loss per foot or even using 12-24volts AC would work better over that distance
Polk SDA SRS, Parasound HCA 3500, Luxman M117, Onkyo 504, 7.62X39, sometimes a ball on a string is the greatest of toys for us nonhuman types. oh and some lasers, lots of lasers