Before we get too far, is there a gas motor driving the generator (as I was assuming) or are you trying to harvest energy from dynamic braking off an electric motor? That matters because a generator isn't the way that is typically done (I assume because it won't work well). The electric cars do this with a bank of large (heavy) capacitors and a high current control circuit connected directly to the drive motor which probably isn't practical nor cost effective in this case. The 3 batteries (which should be 4 to get 48V by the way, 3 will only provide a bit more than 36V) make me think they are the power source as well.If that is true they don't charge fast enough to do much that is useful off dynamic braking and the efficiency loss from converting power to mechanical energy (via the motor) and back to electricity (via the generator) is crippling. In cars the capacitors store the energy from the back emf of the electric motor (eliminating the generator inefficiency) to give the batteries time to charge over time but that takes big expensive capacitors (I've seen them surplus at about $40 each) and a high power control circuit to harvest the back emf during braking.
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