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I love the diagram. Do you know where the solar panel might fall in there?
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I am not the solar expert on the Forum, so I invite others to comment or correct me.
Discussions of solar systems often get bogged down in details very quickly. The details are important if you are installing a solar system, of course, but the diagram you asked about shows things at a summary level. There are two things going on in the TM electrical system - keeping the battery charged, and providing operating power to all the TM load devices.
Charging: In the diagram, you see the TM battery down at the bottom. You see that there are two sources of charge current for the battery. One is the charge line coming from the tow vehicle. The other is the TM's built-in battery charger, physically located in the converter. These two sources are connected directly to the battery, and the battery accepts charge from either or both. A solar system, panels and charge controller, is just a third source of charge current, and like the others, it is also connected at the black-circle junction just above the battery.
Powering the TM: At the same time, you can see that there are two arrows above the battery, one in each direction, showing that the battery can either accept charge current from those sources, or provide load current to all of the TM electrical devices. This, of course is what you expect from a battery, and why you have one.
These two functions happen automatically, as needed, and in the amount needed. In fact, most often, some of the current from the charging sources goes directly to the TM loads, and some of it goes to the battery to top up its charge. The battery doesn't know or care, and neither do the sources or loads.
I hope this clarifies that at a conceptual level, all of this stuff is simple. If I've caused more confusion than clarity, please feel free to ask - either here in the thread, or by PM.
Bill