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I think Ian's post are thoughtful and he seems to be reading the material posted with high levels of comprehension. It will always be "possible" to develop alternative configurations. The question is will they be cost effective? If not then most will never see production on the scale of conventional vehicles. I want a solution that applies to all vehicles, inclusively, not exclusively. If you want to store energy in a battery and use it in an electric motor, you are not excluded from using a HH powertrain, just turn the motor on , without any current regulation, charge the accumulator when it needs it and drive the vehicle normally.
That way those who have the capability to collect energy with solar panels can use that energy to drive their cars. My guess would be that is less than .0001 percent of the vehicle operators in the US, but even that minuscule percentage could use a hydraulic powertrain platform and eliminate the motor controller and achieve higher overall efficiency, especially in the current mostly local high traffic density scenarios in which most BEVs operate.
I posted a long time ago that you could use the same vehicle with interchangeable power modules. One IC and liquid fuel. The other battery electric. Use the first for long distance trips and the second for local operation. As battery technology improved, you would use more of config2 and less of config1 until battery tech became your principle source of energy.
regards
mech
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