For a complete circumnavigation non stop and all of it from renewable sources:
Energy on board ACCIONA 100% EcoPowered por VendeeGlobeTV
I hope that on the next Vendee globe they will make this a mandatory rule. There are talks about that and the sailors are favorable to the idea.
What can be learned and the improvements will be huge and the use on cruising boats will be just a step away
By the way, the batteries are the same I have in my boat, I don't mean the brand, they are the same model and capacity...well I have two of those for the house service and a smaller one for the engine. I guess they have chosen well