I guess I'm lucky. I have a switch from my main panel that feeds a sub-panel for all of the electronics. The sub panel has fused outputs for VHF, 2 fishfinders, stereo, and the Humminbird ethernet hub. Everything up to the subpanel is fed with large wire and I have no problems with any of it. The biggest problems with electronics are caused by either dirty connections and wire used that is too small and causing a voltage drop. If the wire is sized correctly and all connections are clean, you should not have issues with low voltage.
2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner