Wednesday, November 29, 2017

Re: [Electric Boats] Introduction

 

Perfectly possible: have a look at http://www.eboat.org.uk/
ᐧ

Cheers,

Rob Kay
Secretary
Electric Boat Association
104 Stirling Rd, Kilsyth,
G65 0HY
http://www.eboat.org.uk



Home:
Mobile: 0792 2692493
Landline and ansaphone: 01236 823129

On 29 November 2017 at 13:44, Phil Cook philcook@rogers.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

Hi all
I'm new to the group and am looking at the feasibility of repowering a contessa 26 (that we are refitting) with electric.
I'm a little sceptical about the science and capabilities of electric. Weight and range seem to be of greatest issue. It seems that an hour or two at hull speed is about all one can expect from 6 batteries. 6 batteries seem to be quite a weight penalty and have substantial space and cost variables as well.
I'm interested in everyone's comments. Thoughts?

Phil Cook
MBA CET LEED AP


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Re: [Electric Boats] Introduction

 

are you going to use PbA or Li? (Lead Acid or Lithium)
i'm researching how to run on Li batteries and PV bimini (4-8 cheap PV, 250watt+ panels)

On Wednesday, November 29, 2017, 10:31:55 AM EST, Phil Cook philcook@rogers.com [electricboats] <electricboats@yahoogroups.com> wrote:


 

Hi all
I'm new to the group and am looking at the feasibility of repowering a contessa 26 (that we are refitting) with electric.
I'm a little sceptical about the science and capabilities of electric. Weight and range seem to be of greatest issue. It seems that an hour or two at hull speed is about all one can expect from 6 batteries. 6 batteries seem to be quite a weight penalty and have substantial space and cost variables as well.
I'm interested in everyone's comments. Thoughts?

Phil Cook
MBA CET LEED AP

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[Electric Boats] Introduction

 

Hi all
I'm new to the group and am looking at the feasibility of repowering a contessa 26 (that we are refitting) with electric.
I'm a little sceptical about the science and capabilities of electric. Weight and range seem to be of greatest issue. It seems that an hour or two at hull speed is about all one can expect from 6 batteries. 6 batteries seem to be quite a weight penalty and have substantial space and cost variables as well.
I'm interested in everyone's comments. Thoughts?

Phil Cook
MBA CET LEED AP

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Posted by: Phil Cook <philcook@rogers.com>
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Thursday, November 23, 2017

Re: [Electric Boats] Re: Direction and Throttle Direction Controls

 

The throttle setup provided by Electroprop is great. They use a spring-loaded centre detente for neutral. 
Throttle all the way forward is full power forward. 
Throttle all the way to the rear is full power reverse. 
In the middle, a sleeve on the throttle shaft falls into a hole and stops throttle travel. You need to lift the sleeve to move the throttle out of neutral. 
This setup works really well for my boat and to have to do it over, I would definitely do something similar. 

/Jason

--
Jason Taylor
v:514-815-8204

On Nov 23, 2017, at 00:54, Matthew Geier matthew@acfr.usyd.edu.au [electricboats] <electricboats@yahoogroups.com> wrote:

 

On 22/11/17 04:25, Marty Tryon exstig@yahoo.com [electricboats] wrote:
Bill,
Quick question on your throttle control setup.  Using a Morse throttle cable to control the Sevcon throttle; how do you achieve a throttle "lock" in neutral to prevent the electric motor from powering up if someone accidentally bumps the throttle lever, or a line should snag on it and power it up?  That would be a serious concern for me.

I have a separate switch that turns off the controller. Once it's off the position of the throttle no longer as any affect. Also a very visible 'E-stop' button that like wise cuts power (by disconnecting the main power contactor coil so every thing in the motor control chain gets disconnected from the battery supply).


--   Matthew Geier, Computer Systems Administrator  Australian Centre for Field Robotics  Rose St Bld, J04  Ph: +61 2 9351 8149

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Wednesday, November 22, 2017

Re: [Electric Boats] Re: Direction and Throttle Direction Controls

 

On 22/11/17 04:25, Marty Tryon exstig@yahoo.com [electricboats] wrote:
Bill,
Quick question on your throttle control setup.  Using a Morse throttle cable to control the Sevcon throttle; how do you achieve a throttle "lock" in neutral to prevent the electric motor from powering up if someone accidentally bumps the throttle lever, or a line should snag on it and power it up?  That would be a serious concern for me.

I have a separate switch that turns off the controller. Once it's off the position of the throttle no longer as any affect. Also a very visible 'E-stop' button that like wise cuts power (by disconnecting the main power contactor coil so every thing in the motor control chain gets disconnected from the battery supply).


--   Matthew Geier, Computer Systems Administrator  Australian Centre for Field Robotics  Rose St Bld, J04  Ph: +61 2 9351 8149

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Posted by: Matthew Geier <matthew@acfr.usyd.edu.au>
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Re: [Electric Boats] Re: Direction and Throttle Direction Controls

 

On 23/11/17 02:57, king_of_neworleans wrote:

Does it read the serial port output of the Serial to USB adapter, at the USB port? I can get the app to start in Wine, but there is no USB support in Wine, or at least no usable USB capability. So VirtualBox will actually allow it to work as advertised, on a Linux box? I think I have some older versions of Windows, like maybe 7 and XP, around somewhere. I wonder if I would have problems with them in VirtuaBox.

I've run all of the above in Virtualbox. USB pass through works too.

Contact me off list. I suspect most people on this list don't care how their motor controller gets programmed, only that it works..... :-)

What they need to realize is that guys who are likely to put together their own car or boat propulsion systems are exactly the type who might find a closed source OS like WinDOHs or Mac suspicious, limiting, inflexible and abhorrent in general. Techy type tinkerers by and large see and appreciate the tremendous advantages of Linux, and refusing to cater to the Linux crowd is very shortsighted.

The ones I love are the devices that run an embedded Linux OS but can not be configured or used from a PC running Linux. (IP Cameras are what I have in particular mind, there are a whole ecosystem of such camera based on the same 'System on a Chip' that have this issue.).

 
--   Matthew Geier, Computer Systems Administrator  Australian Centre for Field Robotics  Rose St Bld, J04  Ph: +61 2 9351 8149

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Re: [Electric Boats] Re: Direction and Throttle Direction Controls

 




---In electricboats@yahoogroups.com, <matthew@...> wrote :


I have a prop with a good 'bite' (Same prop that was paired with the
direct drive 2 stroke) and the boat has quite some inertia, the prop can
continue to rotate for 10-15 seconds. And i'd rather it no go into
braking mode when the throttle is at 0 as I may really want to 'coast'.
What it needs to do is go into high regen braking the moment you go past
0 to slow the shaft quickly and then reverse.

I suspect there is a way to do this and still have only a single control, but for more flexibility you might want a separate knob on a brake pot so you could use regen braking to quickly stop or slow the freewheeling shaft as desired. I will consult the manual and see if there is not a built in function that will cut down on freewheeling when the throttle is reduced or stopped. I know that there is a switch input to disable regen, so that might be your solution, or part of it. You could locate it inside out of the weather since you would not need to switch back and forth all the time while docking.


I had exactly the same conversation with them - I use a 400amp
controller on with a 100amp motor - just to make sure there is plenty of
head room. The amps out is not scaled, so the meter never went past 1/4
deflection. I tried to ask if they could scale the meter off the current
limit setting, not the full rated load, but they didn't seem to
understand what I was asking.

I think it is probably a 0-5v out signal and the supplied meter is simply a voltmeter,and so maybe you could use a lower range meter and draw your own scale. My beef is that I wanted actual amps readout, on the input, so I could calculate battery drawdown accurately. A percentage of output current is of no use, or even output amps, since it is different from a true flat DC voltage... apples/oranges.

 It works under VirtualBox :-). You do need a valid windows license for
the virtual machine though.
 
Does it read the serial port output of the Serial to USB adapter, at the USB port? I can get the app to start in Wine, but there is no USB support in Wine, or at least no usable USB capability. So VirtualBox will actually allow it to work as advertised, on a Linux box? I think I have some older versions of Windows, like maybe 7 and XP, around somewhere. I wonder if I would have problems with them in VirtuaBox.

What they need to realize is that guys who are likely to put together their own car or boat propulsion systems are exactly the type who might find a closed source OS like WinDOHs or Mac suspicious, limiting, inflexible and abhorrent in general. Techy type tinkerers by and large see and appreciate the tremendous advantages of Linux, and refusing to cater to the Linux crowd is very shortsighted.

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.

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