Jammer and Dave, -- and Chris, and 2air --
Thanks very much for the conversation.
I'm trying to take all of this in.
The power management of a laptop, in this case, a MacBook1,1, is built into the interior power supply, the brick, and even the "plug" on the power cord.
So, the best approach to using the MacBook in the Airstream is to use 110v when possible, and let the electronics do what they are supposed to do. When 110v is not possible, or preferred, or whatever, use an inverter to raise the Airstream's or the tow vehicle's 12v
to 110v, so the electronics can adjust the power accordingly.
Have I restated accurately?
Ready to go on to the TV questions? Is the brick on the power cord, and the built-in power supply inside an LED LCD HDTV, generally, doing the same kind of power conditioning that a laptop's brick and power supply circuitry is doing?
Power fluctuations are managed by the laptop [and possibly the TV] built-in systems. Both use between 12 and 16.5 volts, less power, by design, and will not drain the batteries as much as I imagined, if I am without 110v for a short while (not sure how long).
I would imagine a voltage regulator, generally, would be a good thing to add to the Airstream's power system, for the incoming 110v and also the 12v
produced by the converter (Univolt, at present).
Adding to my list now:
Higher capacity 12v
system, perhaps the 2 - 6v systems I have read about here
Battery charging monitor
Battery conditioning electronics