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If you use a small Permanent magnet motor (like an Etek or the new replacements) like I am doing on my motorcycle regen is pretty easy with the right controller. I'm looking at getting 19kW peak with my 72V conversion. Google kelly controllers for more info, my motor controller, contactor, two throttles and a DC-DC converter were $1450 all up. Then its just 72V worth of batteries and a charger basically.
Solar panels are pretty expensive and might extend the range a little bit ~10% or so. If you leave it in the sun to charge while at work it will do better. I don't know how much power you will get out of a single alternator... if you are doing 48V then you could string 4 together pretty easy without having to rewire them and hook them to the individual batteries.
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