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Go Back   SailNet Community > On Board > Gear & Maintenance > Electric Propulsion - solidnav.com
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Thread: Electric Propulsion - solidnav.com Reply to Thread
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Topic Review (Newest First)
10-06-2011 04:14 PM
Mark F 3 1/2 years into life with the SolidNav Explorer and all is well ;-)
12-14-2009 08:22 PM
Aroostifer
Quote:
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.

Cheers,

- Ari
12-14-2009 08:17 PM
mitiempo It would be worldwide news if Lin and Larry put an engine on Taleisin!
12-14-2009 08:05 PM
tommays Sorry about that my mistake as i had read about Larry and Susan MacDonald finally giving into a motor
12-14-2009 07:54 PM
Aroostifer
Pardey's vs. MacDonald's

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

Are you talking about this thread?

http://www.sailnet.com/forums/gear-m...tml#post544669

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 02:48 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 02:13 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 01:00 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

Mark
12-12-2009 12:38 PM
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.
12-12-2009 12:33 PM
tomwatt Agreed the Torqeedo 4.0 seems about the right size for my application... to put in place of a 9.9 hp 4 stroke. But it ends up running about twice the cost of its gas equivalent, and still leaves me struggling to recharge on an extended trip.
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