Hi Mike,
I'd spoken to Graeme Hawksley at http://www.hybrid-marine.co.uk/ some time back about his regen with the Lynch, and naturally because of commercial confidentiality he wasn't prepared to disclose his 'black box' for regen purposes which he has put a lot of work into, although he was very pleasant and helpful. My reason for speaking to him was I was considering experimenting with an MPPT solar charge controller for regen/charging but my boat simply doesn't have a high enough hull speed, so it was more out of curiosity.
Anyhow, I think you are quite right that it is not easy to have a good charging solution as you certainly have to be able to control it well as the battery reaches full charge. Having said that I think for lithium it would be easier especially as they are basically bulk all the way to 98% and in my case my BMS and high/low voltage relay cut offs would help.
As regards Beta and the hybrid. I also spoke to them a few years back. Their point is commercial and they don't see much benefit, even in terms of fuel savings, to offering a hybrid solution. Clearly Hawksley does that or other benefits and has continued. I think the attraction there is that a hybrid is great for canal barges. Electric propulsion being good at low power witha hybrid, quieter than diesel which is quite an attraction on our canals and a generator as an all in one package as most barges have high house loads and can often be away from shore supply when cruising. Personally and having said that I think 2 dimensional solar and better still my calcs for 3D solar with an MPPT on each face on the long, wide coachroof of a barge is a nicer solution plus a small Honda genny when needed and just pure electric propulsion with a decent bank of lithium or Supercycle or TPPL AGMs.
John R.
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