I just sent to the forum admin the brochure from Silent Yachts. Perhaps he'll post it as it will likely provide more clarity than I can. I do know they offer 3 setup's for LIPO batteries. There is a maximum setup and.... a generator for days that the sun..... well just doesn't appear (and we all know there can be quite a few days of that). Additionally, the yacht has an option for a kite which I've got the quote on. The kite is much more efficient than standard sails. I don't know that companies name off hand but I have their materials also. I do believe it's possible. Might I suggest you query them in youtube as there's a captain that has an older silent yacht, I believe a 64 which is't nearly as efficient that he sailed from Cartagena Spain to Palm Beach Florida. I can send you a private link if you'd like to watch that and hear his assessment.