Originally Posted by Pete7
Why do you need to store 4000Kw of power? How about trying 14Kw, that's 12 x Group 31 batteries and seems quite achievable if you take the diesel engine out.
This guy has just done a cirumnavigation of the North Atlantic. You could watch to see how he go along without an engine.
If you have a yacht and don't need to sail to a time table so being back on Sunday night to go to work on Monday morning, then a number of yachts have proven its quite possible. A trawler
might be a problem and a Miami
Vice Cigarette 50, well your stuffed.
the point here is you have an engine as comfort and added security
when the **** hits the fan.
To compare apple with apple I fully agree with barrymac.
I wouldn't take 400l but 200-300l if you are in a 3 day storm is easyly used when engine runs day&night to safe your ass.
72h by 4l/h (45ft/60hp engine runs on higher RPM
, not comfortably motorsailing
)= 288l, lets go in the middle say 250l = 2500KW in the batteries
And this is what you have bluewater
sailor have to count with on a long range passage
So its 2500KW that need to be stored in batteries or fuel cell, to be 100% comparable and have the same security
then with a diesel and a 250l tank.
Lets face it and be honest, every electric boat that kinda works well out there is
- very lightly build, with high efficency hull
, spartan interieur with a lot of compromises in liveability to safe weight=> and if you would put a diesel in that boat in can be half size (eg 20hp instead 40hp in a 40ft) and uses min 50% fuel less then a conservative bluewater
comparable one (so 2l/h instead of 4l/h. So reduced emissions already by half. And to this you need to compare then to the electric boat (not the heavy bluewater cruiser with double engine size to be fair and 100% comparable). But how much energy&pollution does the production of the carbon fibre you use to make it very light causes? A lot
and how does the total co2 balance look like, deep red
today and near future, with same(!) safety and comfort as a diesel engine (with around +30% higher purchase
then diesel boat):
- full electric daysailing => a clear yes
med full electric sailing, habour to habour day sails
and occassionally 2 or 3 days trip but you could stop daily at habour if you need. => a clear yes
- bluewater sailing, weeks over open ocean and a strom or other event can happen where you need your ironhourse for several days straight or simply the use the panama canal
(obligation to be able motor
for 3 days with 6kn to be able to use it) on your way around the world=> a clear NO, no energy concept
avaliable that can store the needed 2500kw on a 45ft sailboat.
same story with cars: i was forced to have a tesla Model S as company car last year. I warned our CEO before...doing 60000km/year with a Tesla impossible especially with my tide scedule. Well it lasted a week, where I got picked up 4 times by a tow truck because the 300km+ range shown ended up in reality less then 180km range with no charger
nearby plus forced breaks to recharge missed 8 customer meetings and 80k turnover, maybe more because don't know if there would be additional business. Driving overall was horrible, yes nice torque for excelleration but
constant watching of the dreaded battery level was stress pure. And that compares to bluewater sailing.
A week later I had my BMW 335xd that I had requested (instead a 520d, i like smaller and more hp for german highway
) and all was fine...
I owned privately a electric Renault twizzy myself, to go to my 5km away workshop, quickly shopping
in the area etc for that it was perfect, fitted upfront our house on the motorbike parking spot and was heavly incentivised so it cost me less then a motorbike.
Nothing against electric where it makes sense...
everything and 100% bluewater cruising on a 40ft longkeeler pilothouse ketch
(soon a 36 Mahe evolution i hope)