Okay, Here's a stab at this. Now this is the schematics (on paper still) for my bus. I am using a tripp inverter which is able to act as a converter and has a 75 amp charger on it. So it will be a bit different.
Lets start with power sources or where power enters your bus.
1) Shore power 30 amp. If you are going with a 30 amp setup which can handle your massive ac unit and you have access to only 15 amp, you can get an adapter that plugs into the end of your shore power cable for very little money. However be aware you have access to only 15 amps. Not enough for your ac.
2) Generator. Either a 15 or 30 amp connector. If it is perminently mounted instal the appropriate size extension cord that runs from the geni to where your shore power cable connects with the power system. Be sure to have the appropriate ends on the cable. So lets assume your geni only has 15 amp outputs (as mine does). The geni end has a 15 amp plug, then other end has a 30 amp plug.
next step. You can either have a manual plug, like vonslat (i think) has in his unit. This is a fool proof system to ensure you do not have multiple power sources entering your electrical (ac) system. What you do is install a 30 amp plug somewhere dry and clean which you then maually plug either your shore power or generator into. Only one thing can be pluged in at any given time. The other option is an automatic transfer switch. With this unit you are able to perminantly wire your shore power and your generator in and the ats is able to dertimine which is most suitable or able to supply power. This is a handy system if you have a perminantly installed geni and don't want to exit the vehicle to switch your power over. Great if you're on the road, and want to make a cup of coffee or fire up your air conditioner and you forgot to plug in your geni before leaving home or your campground.
So, we have ac power in the bus, Where does it go?
Using the tripp converter/inverter/charger the ac is hardwired into it. From there it runs into a small (or large) ac breaker pannel. This is the same type that is used in homes. In the ac pannel you decide what your needs are. I have four breakers:2 15's, 1 20, 1 30. The kitchen outlets will get the 20, the ac will get the 30, interior plugs get a 15 and exterior plugs get the other 15. This is a very simplified breakdown.
Using a traditional converter, you would run the power from your ats or plug to a breaker pannel. from that you would choose one of the breakers to run your converter. Create an ac outlet and plug the unit in. Be sure the breaker and the plug will work with what requirments the converter needs. On the other side of your converter there should or may be a row of fused outputs. These are what you create your dc system from. If you only have to wires coming out you would create one positive and one negative fused terminal that yoy are then able to run dc appliances off. However it is at this point that I open it up to the group because I have no first hand knowledge of these units. Please correct or modify as you see fit all.
Back to my system. So we have the ac power taken care of, and shore power. What about DC?
Alternator power comes from the engine, to a solonoid that is wired to the ignition. When on the power is distributed to both my starting battery and my deep cycle house batteries. When not engaged it stops the transfer of power. So no power is being robbed from my starting battery. The power runs from my deep cycle batteries to a "guest" battery disconnect which is good for up to 350 amps. This is a marine style unit that allows me to turn off all dc power entering the house system. Good in case of emergencies or maintinance. Next is a large inline fuse (300 amps). Both of these are on the positive lead and large cable. I use 1 guage welding cable with soldered brass conectors. This helps any voltage drop in the system. After the fuse the sytem tee's off. One lead returns to the tripp inverter/converter/charger. The other goes to 12 v fuse bus which is the main power distrobution center for all 12 v leads. Each of these is fused. Again I used marine equipment. It's a bit pricey but far better in regards to what design and quality.
Solar (the wild card
). Solar systems are made up of pannels, conectors and regulators. Mount the pannel(s) on your roof, run the power cable to the regulator, install and inline fuse and run it directly to your house deep cycle batteries.
I hope this is helpful. It took me a long time to get it right in my head. I travelled to many sites online, asked questions and finally was able to have journeyman rv technicians clear up a few fuzzy area's. I feel the system described here is safe, well thought out, not too expensive and makes sense. However I am sure there will be other who disagree. God bless the internet and it's forums.
. Don't install wiring or gas till you know it's right and others who know what they are doing agree. It's too dangerous to cut corners.