I seriously considered the E-bus, but opted out of it for my plane. I've got vfr instrumentation, single com, 196 handheld, ADI, EIS, P-mags, no lights, no efis. When I started planning what to put on the e-bus it was going to be pretty much everything but the contactor. On a plane that runs fine without juice, I just couldn't see the point. Regarding switching the EIS, it just seemed like a real easy thing to do, it complied with manufacturer's instructions, and it does allow me the option of taking it off line for any reason, however unlikely. Regarding fuses, I'm aware that they are there only to protect the wiring, but I'm saying that the manual advises using a 5 amp, which won't blow until a whole lot of juice has gone down the drain. Are there any known failure modes of the EIS or it's sensors that result in an abnormally high current drain? I sure don't know, but I just like the idea of being able to turn stuff off if it starts to go crazy.
Steve Zicree