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On my own Previa, I would probably prefer to have some sort of A/C clutch type mechanism for the alternator, so that I could engage the alternator at will. This would give the batteries a little more range (at the cost of fuel economy, but one could engage it on long downhill sections).
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The A/C clutch idea is oft talked about but I've never seen one done. Would be cool to have. Most people have gone the much simpler route of a switch to the field coils to disable it.
I have a spare battery, amp meter and voltage meter. I have run low a couple of times but only ran out once. My charger unplugged somehow during the night so I only had 30% left to get home. 120Km I had to stop at some point didn't have enough juice to restart. I would have been fine if I didn't have to shut off the van on the ferry. A nice gas station attendant let me charge up with my 25 amp charger for a while and I was on my way in about 20 minutes. Now I have a 50 amp charger so I only need half the time to get enough to get home.
Once you learn about amp hours and get used to your system it becomes just like making sure you have enough gas. I never worry anymore. Just the one accident.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
