SailNet Community - Reply to Topic
Thread: Electric Propulsion - Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Already pinged:
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
12-24-2014 03:09 PM
Re: Electric Propulsion -

I know this is an old thread, but was hoping some SolidNav owners might be still following the thread.

I have all but the motor and relay for a SolidNav 5KW motor. I upgraded my unit to a Electric Yacht controller and display set up.

So, if you know of anyone who has a bad controller, I have good one for a reasonable price.
You could also use this setup for a DIY electric motor set up, just need a motor and 48v relay.

I'm also selling my complete 5kw Electric Yacht motor set up. Comes with everything you need. I'm selling the unit because I bought the boat with the electric already installed and an outboard too. I don't need both, and I do long trips vs short day sailing that require many hours of motoring. I do sail when I can, have enjoyed the electric for maneuvering in the harbor or just out for a day sail.
The Electric Yacht complete unit with 4 (100amp)batteries and charger would be $6000, asking 1/2 price, $3000 OBO
I have complete description and pics here:
5.0 KW Inboard Electric Motor For Sailboat For Sale
10-06-2011 03:14 PM
Mark F 3 1/2 years into life with the SolidNav Explorer and all is well ;-)
12-14-2009 07:22 PM
Originally Posted by tommays View Post
And its fairly sad that your better facts seem to be whose the real sailor rather than even post pictures of some of your working real world installs
Hey Tom,

Not sure if you were talking to me. I'll try to upload some pics of my real world oar installs. Very, very non-electric.

More pics of my boat at:

Macha, 6/1/08 - Lyons Imaging :: Our Galleries

To the other guy, those pics of Desolation Sound look beautiful. Again, I'll say that your boat philosophy depends on your priorities. If your deal is you want to cruise when there's no wind, then a motorsailor might be the best bet.

Why is it that we think "motorsailor" is an insult? It just is what it is, right?

My boat's builder and previous owner sailed her down the coast from Bellingham to San Francisco, where I bought her. He had sailed engineless up around Puget Sound, Gulf Islands, etc.

Down here we're blessed with really good afternoon thermals in the summer -- 20 to 25 knots pretty much every afternoon, so that definitely makes it easier to get around without an engine. Even in flukey areas and flukey seasons, it's possible to make it work -- but it does take patience and hard work.


- Ari
12-14-2009 07:17 PM
mitiempo It would be worldwide news if Lin and Larry put an engine on Taleisin!
12-14-2009 07:05 PM
tommays Sorry about that my mistake as i had read about Larry and Susan MacDonald finally giving into a motor
12-14-2009 06:54 PM
Pardey's vs. MacDonald's

Originally Posted by tommays View Post
The Pardeys have and 8hp and you can read about there ethanol fuel issue right on this page

Are you talking about this thread?

If so, those posts are by Larry and Susan MacDonald, not Lin and Larry Pardey.

Or were you talking about another post? If the Pardeys are using an outboard as an auxiliary these days, I'd be interested to read about it. (Sincerely not sarcastically.)

- Ari
12-14-2009 01:48 AM
Mark F My main reason for two separate banks is redundancy. I came to sailing through aviation (hang gliding) and have grown to respect redundancy. I also thought, to extend range it would be nice to be able to charge one bank with a portable generator while using the other bank for propulsion. In real life (so far) I've never had to do that.

I understand the Peurket Effect dictates a bigger bank will provide more available amp hours but from what I have read at the rate of current draw that I use it's not that big of a factor. In the past I have had an issue with a battery that started to go bad in one bank and while I sorted that out I had a good bank to keep me sailing.

The PakTrakr monitor does give me amp draw among other helpful information to keep my batteries healthy (that's how I found the weakening battery). You are right that knowing amp draw is absolutely necessary. The most I have seen as far as regeneration is concerned is 4 amps at 48 volts.

I have a tight slip that gets some significant surge at times and having my boat walk to starboard is helpful. That said I will be installing the CS at some point.

Thanks for your interest, Mark
12-12-2009 01:13 PM
mitiempo Mark
Just watched the video. It's impressive. $6000 is pretty affordable. If I were to do this I could see a few improvements though. One is combining all batteries in one bank as that gives you more usable amps especially with the large amp use of an electric drive. I'd put a real battery monitor on so I'd know the amps in and out accurately as voltage can't give accuracy until the bank is rested quite a while. The extra life of the batteries will easily more than pay for the monitor which would only cost about $250.
Why do you need a left handed prop to get out of your slip? The Campbell Sailor backs better than most 3 blades and I doubt you'd have a problem - especially with all that torque. What I don't really buy is the power regenerated under sail. The numbers in the video are 200 watts at 6 knots - at what voltage? If it is 48 volts that's only 4 amps. There's just no way to regenerate enough as far as I can tell.
12-12-2009 12:00 PM
Mark F This is a link to SolidNav's you tube video of my boat;
YouTube - SolidNav - Electric Sailboat replacement for the Atomic-4, 2gm20 and other marine diesels

12-12-2009 11:38 AM
Mark F Hi Mitiempo,

That's a beautiful place you live!

I used to have an Ericson 23 (also electric) but now have an Ericson 27.

I understand your concern about range with the summer trips you do , it's not a trivial issue. Also not insurmountable.

My boat had an Atomic 4 then a 6hp outboard.

I have a PakTrakr battery monitor. I find the SOC reading pretty useless as it is set for different max and empty states of charge than my batteries and the two banks are different from each-other. I watch the volts. After 7 hrs at a 20 amp draw I was just under 48 volts, maybe 47.9. I also had +/- 52 volts left in the second bank. I typically use very little current.

Top speed with a 12x10 fixed three (fat) blade prop is 5.8 knots (110 amps). You will eat up amps fast at that rate. 4 knots at 20 amps is what I use if I'm going to have to motor for a long time. I do take a hit on sailing speed with my current prop (1/2 knot?). I have a Campbell Sailor (skinny blades) that I want to try but it is right handed instead of left handed and I need the left handed prop walk to get out of my slip :-). To switch from right to left handed props I have a patch plug that switches the + and - on the low voltage forward/reverse switch (my transmission).

I've got about $6000 into my electric auxiliary.
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

For the best viewing experience please update your browser to Google Chrome