November 2010 Blog Posts (3)

S/V Intrepid Voyage Log: Okinawa, Japan

Sailing an electric powered boat around the world

shisa By Greg Martin The voyage of Project Intrepid Seas begins on the beautiful subtropical Pacific island of Okinawa. Situated at 26 deg. 3o' N, 127 deg. 45' E, Okinawa is the southern-most prefecture of Japan. Okinawa, the main island in the Ryukyu Archipelago…

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Added by Greg Martin on November 20, 2010 at 6:00pm — No Comments

The Conversion of NB Worcester to Electric Drive

Worcester NB Blog Edwin Osborn has an interesting blog about his experiences converting his Colecraft 38' ex-hire boat to run on electric. An interesting experience with lots of technical details- check it out…

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Added by David Jones on November 4, 2010 at 5:30pm — 1 Comment

Day 30: Planet Solar Continues Round the Globe Challenge | Electric Seas

planetsolar_departs_monaco By Greg Martin On September 27, 2010, Turanor Planet Solar, a solar powered catamaran built in Germany, set off from Monaco on a planned 160 day voyage around the world. The vessel, 31 meters in length and covered with 537 square meters of solar panels is powered entirely by photovoltaic energy. The vessel's solar panels can create…

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Added by Greg Martin on November 1, 2010 at 7:30pm — No Comments

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Jan 15
Ard Van Leeuwen posted a discussion

Watts / 1,000 lbs of displacement

I've seen that some people are keeping track of power consumption as it varies by speed and displacement. Here are some ballpark numbers, conservative if anything, to add to the list. The boat is a J/88 listed at 5,000 lbs displacement. The engine is an Oceanvolt SD6 sail drive (6kW nominal power).2 knots, 250 Watts3 knots, 560 Watts4 knots, 980 Watts5 knots, 1.9 kW6 knots, 3.7 kWThe propeller can be unfolded while sailing in order to charge the propulsion batteries. I see around 200 Watts of…See More
Jan 13
Jesper Rugbjerg Madsen posted a discussion

What do we think about these batteries?

Hello all,Thanks for letting me join the forum.I am starting the process of repowering from an old diesel to electric in my 27' sailboat.Batteries are of course essential and I can't see myself doing this with lead/acid or AGM batteries.So I have looked into Lithium options.I've come across these smaller packs that comes complete with BMS and charger for each. The shape of this would fit really great in the locker I have in mind for batteries.I guess one would have to start with at least 3 or 4…See More
Jan 5
Staffan Rolfsson is now a member of Electric Seas
Jan 3
Mark Frasca posted a discussion

Mini BMS

I'm closing in on making the switch to lithium. I am using a Mini BMS for the battery management and having trouble getting the AC relay for the charger to reset. The "key" terminal on the head board is connected to the switch but it does not reset the relay when cycled on and off. If I physically disconnect and reconnect the 12 volt supply to the board the AC relay resets. Does anyone know what the "key" terminal on the head board wants to see?
Oct 25, 2016
Giel Groothuis is now a member of Electric Seas
Oct 21, 2016
Scott Jacques is now a member of Electric Seas
Oct 20, 2016
Profile IconArneut Rodvan, brian eiland, SA Stumbergs and 1 more joined Electric Seas
Oct 17, 2016
George Ojdrovich posted a discussion

Electric sailboat endurance estimates and experience

We talk a lot about range in miles at various speeds, but I think for cruising sailboats the real question is how long can you go without needing to recharge. This includes house loads and motoring.When we had Snow Lily (Tartan 34C) repowered my goal was to get 5 to 7 days cruising without needing any sort of recharge. I was cautioned to go with diesel as range would be a problem, but I really think in terms of sailing and not motoring. The motor is only for in and out of the tight marina, on…See More
Oct 8, 2016
Jim Rockfinder posted a discussion

Post your boat speed !!!

I'd like to try to get a handle on boat speeds.So please:  post your boat details and speeds!  I'll get the ball rolling....- Defintion of "takeoff weight":  just like aircraft:  entire weight of craft + batteries + humans + everything.  If you don't know, take an educated guess.- conversions fyi:        1km/hr = 1.6mph        1km/hr = 1.852knots- HOW I MEASURE SPEED:   I find GPS's generally suck at reading low speeds.  What I do is take two known points (the corner of my dock, and the corner…See More
Sep 21, 2016
Jim Rockfinder is now a member of Electric Seas
Sep 20, 2016
tfrank is now a member of Electric Seas
Sep 13, 2016
George McLaughlin is now a member of Electric Seas
Sep 11, 2016
Pete Lolos is now a member of Electric Seas
Sep 9, 2016
Profile IconRobert Cookson and Joules joined Electric Seas
Sep 8, 2016
SEEWOOSURRUN is now a member of Electric Seas
Aug 14, 2016
Matt Merfert posted a discussion

Solar Electric Pontoon Boat Conversion

Hi All,I just completed conversion of my 24' pontoon boat to 100% solar electric (no shore power or other external charging).It's no speedboat but I am very happy with the results in the given application (small freshwater inland lake, summer-only usage).I think the Torqeedo, solar modules, and charge controllers are generally well enough known on this site, so I will only add that I am particularly satisfied with the 48V/50Ah Gen 2 Chevy Volt battery module performance.  At $850 with shipping…See More
Aug 12, 2016
Profile IconRon Madewell and Nathaniel Kobza joined Electric Seas
Aug 12, 2016
Tom Hruby posted a discussion

Field data from several runs of my St. Pierre Dory

This weekend I had a chance to collect data on the power requirements for my St. Pierre Dory while under way.  I thought it might be of interest to those trying to size a system.It was a calm day and I  recorded speed from my GPS and power from my ammeters.  These numbers are the average of at least 4 readings at each power level going both into the wind and against and with the ebbing tide and against.  The tide was relatively calm and the wind as well so the readings did not differ by more…See More
Aug 9, 2016

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