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I think it depends a lot on alternator speed and load.
You car guys are running your alternators on the highway at high speed with lowish draw (5 to 15) amps from an alt spinning at least 6,000 up to about 9,000.
I am sure I would see more than a 5% gain if I put enough solar on top of the suburban to run the electrical system since the alt runs at 100%+ at lower speeds.
I run my alternator at about 3,600RPM on the highway drawing up to 20 to 25 amps.
Using solar to cover coolant pump, fuel pump and fan losses sounds nice.
To sum it up I think I have more to gain by removing the electrical load only and you have more to gain by deleting the alt or removing the belt.
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