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I'm quite aware that the efficiency of regen on electric hybrids is relatively low, 30% sounds about right.
I also realize that an accumulator is similar to a capacitor. My questions were due to the fact that an accumulator is so similar to a capacitor and for your application it would seem that it would be better if it were a bit more battery like to decrease the on/off cycling of the engine. I'm thinking that your engine is going to have to cycle on and off quite a bit to keep that accumulator in its designed pressure range, unless the accumulator is quite large. That is where the energy density question came in.
So, I guess my real question is how do you plan on minimizing the cycling?
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