Originally Posted by nimblemotors
I have mostly decided to not have any sails
and build my boat
using a hybrid drive of both gasoline and electric propulsion
. There is no question that you can't beat liquid fuel for energy density. There is also no question you can't generate such fuel yourself and must go ashore to buy more of it when you run out. Solar doesn't run out, and what makes it so attractive is that sitting at anchor
it continues to provide great value.
With the current
collapse in the price
, it makes more sense than ever.
What is really needed for a yacht is a way to store a lot of generated electricity.
If you could store enough energy to travel long distances, you can generate it while at anchor
until you have enough to make a passage
Unlike for cars, a yacht system could be big and bulky and inefficient, but must be cheap
and have high energy density
Current batteries are not even close. What is needed is something more like creating liquid fuel from electricity on board. I don't know of any way that is possible at present, but that is the kind of breakthrough needed.
A significant improvement would be using zinc-air batteries.
They have 4x energy density than lithium
. If one can recycle zinc-oxide back into zinc using a system small enough to fit on board, it would be a big improvement.
Old post, but keels were made of lead and some still are, batteries are lead acid , can we not make a lead battery keel
, 2 birds , one stone!
a 3000kg lead acid battery would have a fair amount of storage!
My numbers might be wrong but id say at least a 100kwh f storage
add 300kg more for fuel and 300kg for engine
makes 600kg more batteries for the same weight boat.
so a 42ft mono with 3600kg ballast as batteries , could store around
120kwh in its keel
A 10hp petrol will push a 9000kg boat at 4-5 knots in calm weather
,a 10hp petrol is equivalent to about a 3kw 90 percent efficient electric
, giving a calm weather
cruising range of say 40 hours at 4-6 kn,
i imagine a good sized solar bank or fleixible solar sail? or tow generator
could add on!