Re: [electricboats] How are you grounding your AC (shore power) and your 12 VDC subsystems?

The subject of safety earthing of boat shore power connections will be subject to local electrical standards and is probably different in each country. In Australia, you are subject to AS3004.

I seem to recall an entire section on earthing (and the possibility of galvanic loops) in the standard. I went to look, but while my employer has access to all standards, I don't have the required DRM software on my computer to view more than the index pages.

So depending on your location, you may be subject to national or international electrical standards.

Interaction between the shore power safety earth and the earthing system employed on the boat is complicated and if you get it wrong, you just don't damage your boat, metal parts underwater on your neighbours can be damaged as well.

Definitely an area you should seek expert advice on.

On Sat, 30 Jul 2022 at 23:24, THOMAS VANDERMEULEN <tvinypsi@gmail.com> wrote:

A question to those of you who no longer have an ICE with altenator and therefore no engine negative bus for attaching a 12 VAC safety ground (green) wire to: where are you now connecting your AC safety ground wire?
Best practice seems to be to isolate our 48+ VDC propulsion system's electrical components; but are you grounding any non-current carrying components of your 48+ VDC system or of your 12 VDC boat and/or 12 VDC propulsion system control and monitoring sub-system?  If you are, to what ultimately are you connecting these ground lines?
I've been communicating with technical support at ABYC to get clarifications of their standard E-11, but I'm curious about what people are actually doing out there.
Thanks!
[-tv]
Thomas VanderMeulen
"Grace O'Malley"
Cape Dory 27
Montroe, MI

_._,_._,_

---

Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#32039) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [newarmyguitar24@gmail.com]

_._,_._,_

[electricboats] How are you grounding your AC (shore power) and your 12 VDC subsystems?

A question to those of you who no longer have an ICE with altenator and therefore no engine negative bus for attaching a 12 VAC safety ground (green) wire to: where are you now connecting your AC safety ground wire?
Best practice seems to be to isolate our 48+ VDC propulsion system's electrical components; but are you grounding any non-current carrying components of your 48+ VDC system or of your 12 VDC boat and/or 12 VDC propulsion system control and monitoring sub-system?  If you are, to what ultimately are you connecting these ground lines?
I've been communicating with technical support at ABYC to get clarifications of their standard E-11, but I'm curious about what people are actually doing out there.
Thanks!
[-tv]
Thomas VanderMeulen
"Grace O'Malley"
Cape Dory 27
Montroe, MI

_._,_._,_

---

Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#32038) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [newarmyguitar24@gmail.com]

_._,_._,_

Re: [electricboats] LifePo4 build questions

Overall I am very pleased with the setup and the weight savings. 

The distance and consumption above was at various speeds as I was cruising around mostly mapping bottom contours with the gps map feature in the Garmin sonar. 

Im sorry I can’t help with the question above about the foot control. My unit has a foot control but it is a backup to the wireless control and I have never plugged in the foot control. 

_._,_._,_

---

Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#32037) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [newarmyguitar24@gmail.com]

_._,_._,_

Re: [electricboats] LifePo4 build questions

I had a chance to put some distance on my battery. A recorder gps track of 5.54 miles consumed about 31 amp hours of the 55 available. 

The cell voltages before recharging are pictured below. 

_._,_._,_

---

Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#32036) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [newarmyguitar24@gmail.com]

_._,_._,_

[electricboats] Zapi Controller Parameter Questions

Hello, All:

I've got a Zapi SEM-1 Controller on my Duffy Electric boat, and I'm confused about some of the parameter settings for the controller, so I hope there are some knowledgeable controller people here.

I've got the Zapi handheld programming tool, so I can change the parameters as necessary. Duffy Electric has not been helpful in answering these questions, and I haven't been able to find anyone local with an understanding of some of the interactions of the parameters, so I'm hoping someone here can clue me in. I should also mention that the previous owner may have adjusted some of these parameters, so I'm trying to make sure they are optimal for the motor.

Some additional information - The motor is a 5 hp 48V DC motor with a max current rating of 110A and field current rating of 10A. I believe it's a shunt DC motor (with A1, A2, F1, F2 connections). The power source is a 48V 160Ah NMC battery.

Here are the definitions from the controller manual for the 4 critical parameters for which I have interest:

Maximum Current = Maximum Controller Current
Armature Nominal Current = Parameter fixes a limit for the armature current above which the field current is at least the nominal value, regardless of accelerator position
Weak Dropout = Parameter fixes a limit on the armature current above which field current is increased linearly up to nominal field current (in proportion to the armature current)
Field Nominal Current = Parameter fixes the minimum field nominal current when the potentiometer is between 0% and 60% without total conduction of the armature. Adjustment should be made with reference to the data on the motor label (the indication of nominal field current)

So, here are current parameter settings and questions:

Maximum Current = 100% (options of 82-100% in increments of 2%)
Armature Nominal Current = 54% of Max Current (options of 45-65% in increments of 2 or 3%)
Weak Dropout = 62% of Armature Nominal Current (options of 40-80% in increments of 4 or 5%)
Field Nominal Current = 10 A (as specified in the motor data; options of 7.5 to 13.1 A in increments of 0.5 or 0.6 A)

So, for me, the Maximum Current and Field Nominal Current parameters seem straightforward, but I'm confused by the Armature Nominal Current and especially the Weak Dropout parameters. Are the current settings for these parameters reasonable? What are the implications for the Weak Dropout parameter?

Thanks very much for any perspectives you can offer!

_._,_._,_

---

Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#32035) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [newarmyguitar24@gmail.com]

_._,_._,_

Re: [electricboats] Flange coupler for Thunderstruct gear reduction

You would likely be better served with checking out General Propeller in Florida.

 

https://www.generalpropeller.com/inboard-shafts-and-couplings

Mike

 

Mike Gunning

Director of Sales

Electric Yacht

626 298 2262

855 339 2248 x 1

mike@electricyacht.com

https://electricyacht.com

 

From: electricboats@groups.io <electricboats@groups.io> On Behalf Of Michael Schiller via groups.io
Sent: Wednesday, July 6, 2022 4:05 PM
To: electricboats@groups.io
Subject: Re: [electricboats] Flange coupler for Thunderstruct gear reduction

 

Hello

 

I was told that the couplers were sourced from Graingers.

 

Check their catalog.

 

Regards 

 

Capt. Mike

On Jul 6, 2565 BE, at 5:17 PM, Dan Pfeiffer <dan@pfeiffer.net> wrote:



Search for Buck Algonquin shaft coupler

I'll get you details when I am back home later.

Dan Pfeiffer

On 2022-07-06 1:14 pm, anton.slutsky@gmail.com wrote:

Thank you so much for the very useful reply!  Would you mind mentioning where do you get the actual 4"x1" driver couplers?  I've looked all over Amazon and internet and seems not easy to find a coupler that can take the torsion force.  Or is it easy to manufacture on a lathe?

Re: [electricboats] LifePo4 build questions

That's great I just got a 24v Newport

But the wires were cut short was thinking of using Anderson plugs and a fuse

May use a small 24v lipo or 8 bigger lipho4

But open to other suggestions

Thank you 

Ps also have a mini kota 24v that is broken thinking of putting a mppt controller on it

Psa Also one like yours but the foot control will only do speed and not left right any suggestions for that

Bought a new pedal but still the same

On Friday, July 8, 2022, 10:21:20 AM PDT, Skray775 <kelly@skraye.com> wrote:

The charger gives me individual cell numbers as I charge so I will have those and the milliamperes or amp hours replaced per cell.