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61
Electric Boat Conversions / Re: Regen with reverse switch on but going forward
« Last post by Alpegu on March 31, 2025, 06:29:50 AM »
Update: so far, I've been able to confirm that the reverse button does indeed swap direction of motion even with a hyperbolic throttle, provided I go to neutral first (makes sense).

When I short the regen brake button, regardless of spin direction, the motor stops quickly and I get the 17 beep alarm that I'd expect when regen is on (as seen on other posts). Whether this actually recharges the batteries or not remains to be seen, as the motor isn't yet connected to the propeller, nor indeed is the boat in the water yet.
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Electric Boat Conversions / Re: VEC300 for boat: questions about regen, reverse, hall effect throttle
« Last post by Bikemad on March 30, 2025, 02:10:00 PM »
Quote from: Alpegu on March 26, 2025, 02:24:26 PM
Is there any way I can find out about the answer to these?

I don't know if the motor actually produces the same amount of power in Reverse as it does in the default Forward direction, and I don't know how/if the Reverse switch function will affect the motor operation when the Hyperbola throttle mode (Boat throttle with Forward-Neutral-Reverse operation) is being used.

You could simply try fitting a Reverse switch and see if it has any effect on the motor's direction and/or rpm.

Alan
 
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Reviews / Re: Magic Pie 5 ... Still no problems 4 years later ...
« Last post by diverdon on March 27, 2025, 05:41:44 PM »
   

      March 27 2025 .. Another year of riding the Magic Pie most every day for an hour or 2 ... And ZERO Problems for another Year .. Thanks For the Great Product and Support ... Don J.
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Electric Boat Conversions / Regen with reverse switch on but going forward
« Last post by Alpegu on March 26, 2025, 08:59:28 PM »
Hi everyone, I'm hoping you can help me with some questions regarding reverse and regen:

I have a GM BLDC 5kW motor and a VEC300 controller on my sailboat. Due to the way the motor sits, the boat goes forward when the motor turns anti-clockwise. Last year, I had a DIY potentiometer throttle that didn't last long, so I've bought a hall-type throttle from Miromax. It seems alright but it can only be installed in such a way that pushing the lever forward delivers a lower signal, ie it sends a reverse signal to the motor.

Now, since this direction of motor rotation is what makes my boat go forward, it seems perfect. But, I won't get any regen as the motor will always be "reversing". I know I can swap the blue and green cables, plus the hall cables, to reverse the default forward direction of the motor, but that would mean that pushing my throttle forward would make the boat go backwards.

My questions:

- How can I keep the throttle in its current position, while still being able to get regen?

- Does shorting the reverse button just swap the direction of movement? If I short the reverse switch, will it just swap which way my boat goes relative to the throttle signal?

- Does the reverse switch even work with a hyperbolic throttle type, where you already reverse by moving the throttle backwards from the midpoint?

- If this is the case, can I short both regen and reverse buttons to "swap" the direction that the controller considers to be forward, allowing regen to take place?

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Electric Boat Conversions / Re: Boat throttle mod runs motor in reverse…
« Last post by Alpegu on March 26, 2025, 02:50:19 PM »
Hi, I've got the same issue and was wondering how you solved it?
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Electric Boat Conversions / Re: VEC300 for boat: questions about regen, revers, hall effect throttle
« Last post by Alpegu on March 26, 2025, 02:24:26 PM »
Thank you!

Is there any way I can find out about the answer to these?

I don't know if the motor actually produces the same amount of power in Reverse as it does in the default Forward direction, and I don't know how/if the Reverse switch function will affect the motor operation when the Hyperbola throttle mode (Boat throttle with Forward-Neutral-Reverse operation) is being used.
67
Electric Boat Conversions / Re: Questions about continuous regen
« Last post by Bikemad on March 25, 2025, 06:09:26 PM »
Hi andto the forum.

Unfortunately, I have no experience with either the HTM07KW motor or the EZ-A72400 controller so I don't know what sort of regen current output you might expect to see, or whether continuous regen operation would cause any problems.

The EZ-A72400 has a rated motor power of 3-6kW, but the HTM07KW is rated at 7kW with a peak of 18kW therefore the EZ- A72500 rated for a 4-7kW motor (or even the EZ-A72800 rated for 7-12kw motor) might be a better choice of controller if more power is likely to be required occasionally.

As the HTM07KW motor is rated for 92A @ 72V (6.624kW @ 1,950rpm) I'm guessing that it might produce a regen output of ~78A @ 84V maximum charging voltage (6.552kW @ 2,275rpm) if the regen efficiency is somewhere near the motor's power output efficiency.

I also noticed that the 7 and 11kW motors are both described as having "Natural cooling" yet they both appear to have liquid cooling pipe connections. ::)

Alan
 
68
Electric Boat Conversions / Re: VEC300 for boat: questions about regen, revers, hall effect throttle
« Last post by Bikemad on March 25, 2025, 05:02:17 PM »
Hi andto the forum.

I don't know if the motor actually produces the same amount of power in Reverse as it does in the default Forward direction, and I don't know how/if the Reverse switch function will affect the motor operation when the Hyperbola throttle mode (Boat throttle with Forward-Neutral-Reverse operation) is being used.

Regenerative braking (and also the Cruise Control function) does not usually work in reverse, so I suspect you will not be able to get regen working in the forward direction without reversing the current throttle operation, and you'll also need to reconfigure the motor to run in the opposite direction by default.

If you have to run it in Reverse, make sure that the "Backword speed ratio (%)" and the "Reverse torque ratio (%)" are both set to 100%.

Alan
 
69
Electric Boat Conversions / Questions about continuous regen
« Last post by Almex on March 24, 2025, 04:15:23 PM »
I am planning a conversion to electric of my 39ft Catana sailing catamaran with old, smelly 18hp diesels I am considering using two 7kw 72v axial flux  motors to  drive the existing sail drives directly, without gear reduction or the existing transmission  as the rated speed of 1950 rpm a good match for the prop speeds of 800-2000 rpm.  So two HTM07KW motors, one in each hull. Will these motors be okay operating for hours at a time? The motors will usually be operated at low power setting to extend the range, usually less than 2000 watts combined.  Usually the motors will only be used for a few minutes, to get the boat out of the marina unless there is no wind and we need to get somewhere..

So my main question is that I would like to know if using a third HTM07KW motor attached to a 12hp Kutoba diesel as a 72v generator with the same EZKontrol 800A controller as I am using for the drive motors. Can the controller handle regenerating  continuously? can the motor?  I hope for around 5-6kw from the 9KW (12hp) diesel at 1800- 2400 rpm.  The diesel is at it's tq peak from 2000-2600 rpm, so I would drive motor directly as it matches the rpm range  of the HTM07KW.  I already own the diesel engine.

I like that I would have three of the same motors and controllers as I'll be sailing long passages and could swap them if one failed. Keeping the generator light as possible is another reason I am considering this set up instead of a regular brushed alternator that would be much heavier. This generator would not be used too often, probably only a few times a year as the boat also has 1200 watts of solar, a hydrogenerator,  a wind generator and sails..  I am planning to use a 72v 300ah Lifepo4 battery for the motors.

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Electric Boat Conversions / VEC300 for boat: questions about regen, revers, hall effect throttle
« Last post by Alpegu on March 24, 2025, 02:57:17 PM »
Hi, I've had the goldenmotor 5kW BLDC for a year now and it's been working okay, but not perfectly. I hope to have fixed most of the issues, which came from my suboptimal setup, but now I find myself with the following situation.

I have a hall effect throttle which, due to its peculiar design, can only be set up "backwards" on my boat - it will send a "reverse" signal when pushed forward and a "forward" signal when pushed back. Since it's not a potentiometer, I can't just swap the wires. This in itself isn't a problem, since my transmission was accidentally set up in a way that the motor's default reverse direction actually makes my boat go forward.

Now, my questions:
- Is it an issue to mostly be motoring in the motor's default reverse direction?
- Last year, I could never get regen to work, and reading other posts it seems that the fact I was in reverse might be the cause for this, as the controller doesn't seem to regen if it thinks I'm in reverse. Would it work for me to use the regen and "reverse direction" buttons when trying to get regen? As I understand it, the "reverse direction" button only changes what direction the motor considers forward, so shorting this would work?
- If I end up always being in reverse, what settings should I program onto the controller? 100% throttle speed in reverse? Anything else?
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