Thanks Mike!
What experience I do have is more on the physical/mechanical side. I am less worried about building mounts and pulleys and more worried about the trons. Connectors I think I can handle, but power relay starts to sound like black magic to me...
I thought the DIY kits solved most of the electrical problems and left the installation and its attendant mechanical problems to the DIYer, but the more I read the more it sounds like that's not completely true.
Paul
--- In electricboats@yahoogroups.com, Mike <biankablog@...> wrote:
>
> Â
> Paul:
> Â
> You are not missing anything. Electric Propulsion systems are really pretty simple and yes you can put together a system from individual components and save money depending on how handy and knowledgeable you are regarding the electronics and wiring. This group has a number of people who have done it. I think what you are paying for with more "turn key" systems is the engineering that has already calculated the properly sized components like controller, heat sinks etc... and packaged them into a suitable enclosure with a fuse, meter shunt, fan, power relay, connectors  etc... Personally I went with a turn key system because I did not want to have to make all those choices regarding components and sizing the system for my boat. But, it's a decision only you can make as to which way you want to go.
> Â
> Capt. Mike
> http://biankablog.blogspot.com
>
>
>
> --- On Tue, 9/28/10, tartan27hull157 <tartan27hull157@...> wrote:
>
>
> From: tartan27hull157 <tartan27hull157@...>
> Subject: [Electric Boats] Tartan 27 conversion
> To: electricboats@yahoogroups.com
> Date: Tuesday, September 28, 2010, 3:55 AM
>
>
> Â
>
>
>
> Hi all,
>
> I have been lurking and reading for some time while I nurse the 45-year-old Atomic 4 in my Tartan 27, a 27 ft LOA, 21 ft LWL, 10,500# displacement-hull sailboat (currently propped with a 13x8x2).
>
> It seems like a reasonable replacement for this boat could be built around a 4kW motor with a 2:1 reduction and as much battery as I can afford from a weight and $$ perspective (it would save some money if the initial installation could preserve the current prop and shaft, and if my calculations are correct, that prop should push the boat to hull speed around 1700 shaft rpm...sound right?)
>
> I am puzzled by the price difference between $1400 kits which seem to be lacking only the reduction system and the batteries (eg EVParts, ThunderStruck), and $4000 systems which purport to be "drop in" except for batteries (eg SeaNav, ElectricYacht).
>
> Am I missing something? It seems like with the extra $2600 and a McMaster-Carr catalog I should be able to buy some pulleys and belts and bearings and angle iron, build the DIY system, and still have some pocket change left over to buy batteries. Am I overlooking a significant component?
>
> Also, my prop shaft as designed is supported only by the cutless bearing and the big, heavy engine's output flange. Should I plan on stabilizing my prop shaft somewhere in the shaft alley with a strut, or can the smaller electric motor be installed in a robust enough way that it supports the shaft?
>
> Thanks in advance, Paul
> Tartan 27 #157
> Annapolis, MD
>
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