Here is some random high level numbers to think about:
- Motor: 25700lbs displacements and rule of thumb of 1500lbs/eHP (Maybe?) ~ 18hp ~ 15kW electric motor;
- batteries: 10 hrs Cruising ~ 150kWh, almost a 2x Tesla S batteries so 2x 1200lbs, less batteries, less $$$ and less weight;
- Hybrid Power in Series/parallel ~ 25hp of diesel, so half of the original 50hp;
- Oceanvolt is one of options.
Happy Loong weekend to all,
Tai
On Thu, Jul 2, 2020 at 3:49 PM Marty Lampner martin@lampner.net [electricboats] <electricboats@yahoogroups..com> wrote:
As said earlier on whether it makes sense really depends on how you use your auxiliary power, and for that matter also the size of the boat, which impacts in several ways. Lets speak to size, as the boat gets larger you can have to have larger battery banks, the negative of that is they too add weight and a larger saliboat is already a sizable mass. Weight is an issue for boats just as it is for electric cars but perhaps less obvious but can really change the way the boat handles. Yes you get rid of the weight of the diesel but the boat was designed with an engine in mind. Many put some of their batteries in the "engine room" but there are limits and moving the weight around may impact handling.If you are a cruising sailor (spell check just tried to turn that into cursing) and retired you may be less concerned but as has already been said realistically without filling the boat with batteries the amount of time is limited even at reduced speeds. We looked at converting my 30 foot sailboat to electric when its ancient YSB12 had coughed its last time. We ultimately determined that electric would work for us 80% of the time. However the highlight of each season was the long trip. As someone who was working during that period going electric would not permit us to do things we truly enjoyed, sailing to NYC from Baltimore and back, going round Delmarva. In both of those trips there was the likelihood of one or more days with no wind or worse yet an unfavorable wind. As someone who needed to be back within a day or two of the planned travel time we needed to be able to move under power if the wind wasn't there. If we had been willing to give that up or our life style had changed earlier most days we would have been able to live with 2 to 4 hour power supply and in most cases would never have consumed much of that.I don't see much about people attempting to create a hybrid drive system. Presumably a boat your size might be able to carry a substantial generator to either recharge at anchor or drive the boat when the batteries were down. I actually spoke with one owner selling a boat setup with that. We ultimately did not buy it as I could not get straight answers about how far and how fast he had actually driven the boat using the generator.
On July 2, 2020 at 6:11:55 PM, Colin Davis colin.a.davis@gmail.com [electricboats] (electricboats@yahoogroups.com) wrote:
I found this comment by John very intriguing:"But the bottom line is that you have to do an electric conversion because you want an electric boat - not because it makes financial sense."Is anyone aware of any 'calculators' or 'worksheets' that help determine the cost of electric conversion vs. a replacement engine? I know it's not a straightforward question, but I'm wondering if anyone has created any sort of 'step by step' tool to help folks make the comparison. Some quick searching shows some 'guides' like this:But this still requires lots of number crunching by the individual. I'm thinking of something more like this, for boat conversions:At some point (maybe still years from now, with better batteries, etc?) it seems like it might very much make financial sense (for _some_ situations, when considering Total Cost of Ownership, etc., etc.. Caveats apply). But for someone like James, it should would be nice to have a handy-dandy worksheet to fill out that could get him started.On Thu, Jul 2, 2020 at 4:26 PM Gene gfusch@hotmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
One may also wish to look at Elco's plug and cruise option as they have been making electric boats for over 120 years. https://www.elcomotoryachts.com or https://www.elcomotoryachts.com/product-category/electric-inboards/
Gene
From: electricboats@yahoogroups.com <electricboats@yahoogroups.com> on behalf of Jesper Malmberg jesper.malmberg86@gmail.com [electricboats] <electricboats@yahoogroups.com>
Sent: Thursday, July 2, 2020 12:27 PM
To: electricboats@yahoogroups.com <electricboats@yahoogroups.com>
Subject: Re: [Electric Boats] Electric conversionI'm in the middle of a conversion and if you have not already, take a look at the following.
Thunderstruck-ev.com, this is the cheapest and most DIY solution that I have found anyways, I believe their system is the cheapest out there, but not specifically built for marine use. I think it's also most suited for smaller boats. This is the route I'm going down on my 30 foot sailboat.
Electroprop.com, basically the same parts in their system but as far as I can tell is a bit more custom for your boat.
Electric yacht.com, a more professional system intended for maritime use. It seems good but is about twice the price compared to the two above.
Torqeedo.com, this is probably the most professional option I've seen. But it is very expensive.
Also for inspiration there are numerous YouTube channels out there. Learning the lines, sailing Uma and sailing Saoirse to name a few.
Anyways, this is all just based on my research, and I agree with John, You do this because you want an electric boat, perhaps only for daysailing, it is not a replacement for a diesel. At lest not with today's batteries.... good luck!
/Jesper
On Thu, Jul 2, 2020, 10:37 oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
James,Start by outlining what you want to do with the boat.
Will you only sail it with minimal aux power to get in and out of the marina? Or do you want to be able to cruise for several hours with the sails down?
What speed are you comfortable with? How long will your trips be?
With that kind of insight, then an expert might be able to make some guesses on the type of motor that would be appropriate.
If you know the motor, and the range / speed you want to be able to go - then you can calculate the size of the battery bank. Then you can start to get an idea of what the cost of an electric conversion will be.
Be prepared: For that size boat, if you want any kind of significant range (and I'm only talking 2 hours or so.... plus a 3rd hour for margin) - the cost of a conversion will most likely exceed the cost of having the diesel replaced.
The advantage of going electric is that maintenance can be considerably less. No oil changes. Probably no impeller changes unless you go with a water cooled motor. You can get rid of a couple of holes in the boat!
But the bottom line is that you have to do an electric conversion because you want an electric boat - not because it makes financial sense.
Hope that helps some.
John
On Thursday, July 2, 2020, 12:02:40 PM CDT, financial@jamesschmidt.xyz [electricboats] <electricboats@yahoogroups.com> wrote:
I have a 1971 CT 41 sailboat with a frozen 50 hp diesel engine. My boat displaces 25700 lbs. Where di I start?
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