Repowering with an electric engine? - Page 6 - SailNet Community
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post #51 of 158 Old 02-22-2014
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Re: Repowering with an electric engine?

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Originally Posted by Lou452 View Post
How many people go out on a boat to save money ?
It is an engineering problem with limitations. Someone will solve it.
I like the way you pull at and pick and expose the problems with battery, solar and hybrid power. A problem needs to be pulled apart in order to understand it.
Kind Regards, Lou
Anyone that goes into electric or hybrid propulsion without the knowledge of its limitations is a fool.

I'm practical.

If you want to spend the bucks and be a pioneer that's fine with me. But it isn't economically feasible as of yet. It makes a new diesel engine for conventional propulsion seem pretty inexpensive.

Brian
Living aboard in Victoria Harbour

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post #52 of 158 Old 02-25-2014
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Re: Repowering with an electric engine?

Agreed not for the cruisers, but I have done it on my Oday 28, gets me in and out of my club no problems.
Basically zero transmission losses, no warm up time, full reverse to full forward as fast as you can rotate the throttle.

Depth of discharge never an issue, while day sailing I recover to full SOC by the time I'm ready to come back to the dock via prop generating while under sail.

Definitely has limitations if you're not on the dock each night, or if fighting tidal or river currents etc..... But I'm just n Lake Ontario, docked each night and "plugged in" still 2-3 days for short duration outings and to anchor etc....I have no troubles.

No solar
48v bank (8xGC2) same set since 2008
DualPRo Quad bank Professional Series charger
Very clean, no smell & very minimal noise
On weight it was basically a trade off for me, batteries in tray where old engine was, boat balanced the same.
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post #53 of 158 Old 02-25-2014
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Re: Repowering with an electric engine?

nice! and jealous!

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post #54 of 158 Old 02-25-2014
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Re: Repowering with an electric engine?

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Originally Posted by ODay e-pod View Post
Depth of discharge never an issue, while day sailing I recover to full SOC by the time I'm ready to come back to the dock via prop generating while under sail.


No solar
48v bank (8xGC2) same set since 2008
DualPRo Quad bank Professional Series charger
Very clean, no smell & very minimal noise
On weight it was basically a trade off for me, batteries in tray where old engine was, boat balanced the same.
How much power do you use (in AH) going out and what amperage with prop regeneration do you achieve? How do you measure this?

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post #55 of 158 Old 02-26-2014
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Re: Repowering with an electric engine?

the regen kits have amp gauges that show how much you are putting back in, the good ones show everything....amp draw at what voltage, and even how much time you have left at said draw etc...

I too would like more info from epod I still want to do this

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post #56 of 158 Old 02-26-2014
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Re: Repowering with an electric engine?

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Haven't posted pcs in while, hopee this works
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post #57 of 158 Old 02-26-2014
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Re: Repowering with an electric engine?

But do you know how many AH's you use and how large the regen current is?

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Re: Repowering with an electric engine?

Not exactly, I only check the remote when heading out and when tied back up, need to cycle thru a lot of the settings.
But in general my 48v string at 216a never drops below 75% soc on display and when I return to slip generally I have recovered to 100%. Now the variables on the regen depend on time out and speed etc......I'm usually out 4-6 hrs as the norm, on shorter trips say a few hours I get back to about 83% before hooking back up to shore power and charger.
The coasting regen has been good, and I don't race obviously.
I have never seriously looked into solar or wind applications, but I'm also not a coastal cruiser etc....I have a honda EU2000i I take with me for piece of mind on overnighters when I don't have shore power option, never had to use it once yet
There are a lot of variables. This spring I will read the regen amps going in over a week of my small evening cruises and update post.
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post #59 of 158 Old 02-28-2014
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Re: Repowering with an electric engine?

wed love to know more reports

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post #60 of 158 Old 03-02-2014
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Re: Repowering with an electric engine?

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Originally Posted by ODay e-pod View Post
48v bank (8xGC2) same set since 2008
On weight it was basically a trade off for me, batteries in tray where old engine was, boat balanced the same.
A GC2 battery weighs about 65lbs. That makes 8 of them about 520lbs. The stock engine in your O'Day 28 appears to have been a Universal 12, which weighs 175lbs. I wouldn't call 350lbs extra "nothing", especially since the battery and other parts of the system aren't zero pounds either.

Since you have the monitor it would be interesting to know how many watts you are putting back into the battery bank when sailing at a typical speed (say 5 knots).

There is one user report here:
THE BIANKA LOG BLOG: ANOTHER ADVANTAGE OF ELECTRIC PROPULSION: REGEN

Looking at the video it looks like he is generating an average of 0.5 amps at 6 knots. He links to another video which appears to generate an average of about 1-2 amps at over 7 knots. Neither video reports voltage, but I'll guess that is measured 48 volts.

On this page you can see the power consumption for motoring:
THE BIANKA LOG BLOG: HARBOR TEST 2013 Part Two: Watts Up With The Data!

So if you motor this boat for 10 minutes at 4 knots (30 amps) you will consume 4.5 amp hours. If the regen system can put back in 0.5 amps when sailing at 6 knots you would need to sail for 9 hours to top off the battery banks completely.

Does this match your experience?

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electric inboard , recharging , repowering , solar panels

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