Joined: Mar 2014
Posts: 18,448
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From: ,location, location
Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
Regen stuff is an absolute waste for e-bikes and other small lightweight vehicles. You need some mass to get some actual power so in the end you are just expending more effort to get a drop of electric power.
What I would recommend is stopping places taking a break maybe grabbing some lunch and charging while you eat. If it is a dual battery system you will be able to charge a couple batteries at once which will help. It won't be perfect but it will help a bit.