One booster per level should be ample power.
The only common connection between boosters is the control bus cable. If you're going to fabricate your own control bus cable, be sure to read the instructions carefully about crimping on the connectors. If you crimp one on wrong, that booster's output will be out of phase.
We have 4 boosters on our large HO scale club layout plus the main PowerHouse Pro Command Station. All track wiring is through PSX circuit breakers so the entire layout doesn't shut down if there's a problem.
If you don't already have it, the NCE DB5 user manual in .PDF format can be downloaded from the following site:
https://ncedcc.zendesk.com/hc/en-us/articles/200537709-DB5-5-amp-Dumb-Booster
I am building a new layout (HO with NCE) which will be a 3 level shelf around my shed which is 9x6 mtrs.
My layout will run sound and non-sound engines, passenger trains, freight trains (consisted 3-4 units) , steam and yard switching, plus local industry switching ,
So there will be lots of trains running and a few people in a OP session as well, so I will need ample power. I want to add 3, 5 amp SB3 booster to each level....so heres my question
Should I join the boosters to the main track buss at each level separated by an EB1?
or
should I have the 3 boosters connected to each other by the control bus socket at the bottom level and just run the track buss all the way around and up to the top ?
IF i do it this way would there be voltage drop over such a distance to the top level? How would you guys go about this?
Thanks in advance