Date   

Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

Craig Briggs
 

Roger that, Admiral 

All the best,
Craig


Re: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

Mark Garver
 


Bill and Judy,

Thank you for all that you do for us Amel owners. Being one of the newest members of the Amel family, our decision to buy our 1993 SM this past August, was in large part to your story and adventures, and to the family we observed on this forum prior even to joining. Being fellow Texans there was something about the two of you and BeBe, and to be honest learning of you selling her was a day of mixed emotions. The brighter side of that event was that my wife and I decided to stop simply admiring Amel's from a distance and window shopping to making a visit to It's Good in Virginia and making an offer on Memorial Day of this year.

Since our closing at the end of August we have spent time making the boat ours, fixing minor things, labeling things and getting to know the boat. That said, every time we have made it up to visit there was a tropical storm looming near by, pushing high winds and sea toward where we were tied up at the Marina. That was also a blessing in disguise, because it made my wife feel very comfortable and safe.

Soon we will be bringing the boat down to Charleston, SC for the winter, and we will be reaching out to you hoping to get on your calendar and becoming graduates of the Amel School!

Thank you so much, maybe we can drive down to Galveston for lunch with the two of you, we are up in the Lake Conroe area, so not too far at all.

Godspeed to you both!

Best,

Mark and Jennifer Garver
It's Good
1993 SM #105


On Oct 18, 2017, at 02:12 PM, "'Bill & Judy Rouse' yahoogroups@... [amelyachtowners]" wrote:

 


All Amel Owners and Friends,

I have participated in this forum and with this wonderful group of people for 12 years. It has been fulfilling, educational, and occasionally entertaining.

As many of you know, we sold BeBe to great new owners, Dan & Lori Carlson, earlier this year. Many of you asked me to continue as part of this group and I have tried to participate when I feel as though I have something to contribute. You may have noticed a recent lack of participation.

And, as some of you know, several months ago I started Amel School which gives me the opportunity to train owners that are new-to-Amel. I also help those who want to buy an Amel to choose the best Amel for their budget (Pre-Purchase Consulting). I had my 400 page Amel Book printed and bound for my Amel School clients and I provide 24/7 Support to them. I am proud to say that in a few months I have clients throughout the world and just added my 20th client. Most are members of this Group.

This brings me to what I need to post today. I am going to almost totally remove myself from the Amel Yacht Owners Forum. I need to do this to be able to serve my clients properly. I do hope that you understand this. In the past few months I have been asked by a number of you about my Amel Book and other Amel School related services. I have a parting offer for members of this Yahoo Amel Yacht Owners Group who have owned their Amels for 2 years or longer. If you are interested please follow this link to a hidden page on my website: Amel Yacht Owners Group.

Hopefully we will meet (again) somewhere on the water while I am with one of my Amel School Clients. 

Best,


CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970



Re: The Times They are a Changin' - Message from Bill Rouse

Jose_Luis Isasi
 

Fair Winds, Bill!
Thank you for all your support during all these years!
Pay us a visit from time to time!

JL
Group moderator


Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

Ian Park
 

James
The Santorin is 12v throughout. Much easier for my simple knowledge of electrical systems! But I believe the bow thruster is the same as the SM apart from the motor. Being smaller and lighter it won’t need the higher wattage.

Ian

Ocean Hobo SN 96 ashore Clarke’s Court, Grenada.


Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

James Alton
 

Bill Kinney,

   Thanks for doing the testing and providing the results.  I knew that the SM bow thruster was more powerful than the earlier Amel bow thrusters but the upgrade in power is far more than I realized.    From your measurements,  if my math is correct, 420 x 24.1 = 10,122 watts/ 750 = almost 13.5 HP electric as compared to the unit on my boat having around 1.6 HP.  In the case of your voltage measurement, can I assume that the 24.1 volts being measured at the battery terminals rather than the thruster motor terminals?  

   I have never seen a 500 AMP or larger DC breaker so perhaps the lack of availability is this is the reason Amel did not install that form of protection?  Clearly the system has worked well for a lot of boats over a long period of time, but the fuses you mentioned do seem like a good idea in case a short ever developed.

   With the SM motor rated for 6.3 KW and actually being hit with 10KW+ I can now understand the reason that it is important on the SM to limit the burst time to 30 seconds to control motor heating.   With the thruster on my Maramu, a run of 2 minutes results in very very minor heating  (Maybe a 10C rise at most)  but then a thruster is generally only needed for short bursts so I think that the path Amel took to push the motor harder for a short duration was a good choice.  I am wondering if it might be possible for me to increase the power on my thruster by changing to to a different motor?  A doubling in power would be nice to have for higher winds,  perhaps someone else has already looked into this?      The lower unit of the thruster shares many of the same parts with the SM based on the bow thruster items I have ordered so far from Maude and I think even turns the same size prop as some of the SM's.  

   Would you know  (or anyone else reading this)  if the Santorin uses 12 or 24V on it’s bow thruster?

Best,

James Alton
SV Sueno,  Maramu #220

On Oct 18, 2017, at 8:52 PM, greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:

James,


The SM does not have any factory installed protection for the bow thruster circuit.  On my boat the fuses on the battery terminals have a total rated load of 500 Amps, which is reasonable based on the ampacity of the wire used, and has never blown while in use.

And... since I am on the boat, rather than calculating, or looking up, or guessing...  I figured a bit of measurement is in order.  With fully charged batteries (and charger off) using the Magnetronic Amp meter to measure the current draw, and my Smartguage to simultaneously display voltage,  here is what I find:

The bow thruster draws 420 Amps at 24.1 volts.  That's where it stabilized after about 5 seconds.  That's with the boat tied tightly in a slip, so any movement of the hull would (slightly) reduce the load on the prop.

It figures...  almost exactly splitting the difference between what Amel has in the manual, and what the motor nameplate says.  If it matters, this motor was just professionally overhauled last year with new brushes, windings, etc.

Bill Kinney
SM160, Harmonie
Back Creek Annapolis, MD

---In amelyachtowners@..., wrote :

Bill Kinney,

   Good point about the voltage drop. I measured mine as dropping from 13.5 (charger was on so this was not an accurate test) to about 11.75 after a 5 second burst. 

   Does the SM have a breaker for the bow thruster and if so can you tell me the amperage?   I guess that the 6.3KW rating doesn’t tell us much since we don’t know how loaded the motor is.  

   Also, can someone tell me about how much free play is normal for a bow thruster?  I can rock the prop on my thruster back and forth about 3/16” without any resistance as measured from the tips of the blades.  The output shaft does not seem to have any play in it’s bearing so I assume that what I am feeling is the gear lash plus any play in the shaft to motor splines.

James Alton
SV Sueno,  Maramu #220




Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

Ian Tyler
 

Dear All,
Check this out. It confirms Bill's statement.
Amps = Watts/Volts
Watts = Amps x Volts
Taken from:
It explains why, in the UK (240V power supply), domestic appliances are restricted to 3,000W and the power circuits protected with a 13A fuse in the appliance plug (3000 / 240 = 12.5).
Ian
Apprentice/potential Amel owner


Re: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

Peter Forbes
 

Bill,

I am sorry to see you go - it was a pleasure to give you and Judy dinner all those months ago in the Med. Thank you for all your help and support. With best wishes
Peter Forbes
Amel 54#035
Carango
Grenada


On 18 Oct 2017, at 19:25, Alexandre Uster von Baar uster@... [amelyachtowners] <amelyachtowners@...> wrote:

 

Dear Bill,

It is with sadness but understanding that I see you retract yourself of the Forum…
This was my fear after I heard you sold BeBe and was glad you kept active.
I am glad the Amel School is working well and hope it continue to grow.
I can’t thank you enough for all the years of wonderful support.

Sincerely, Alexandre

--------------------------------------------
On Wed, 10/18/17, 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse
To: "amelyachtowners@..." <amelyachtowners@...>
Date: Wednesday, October 18, 2017, 1:12 PM


 









All
Amel Owners and Friends,

I
have participated in this forum and with this wonderful
group of people for 12
years. It has been fulfilling, educational, and occasionally
entertaining.

As
many of you know, we sold BeBe to great new owners, Dan
& Lori Carlson,
earlier this year. Many of you asked me to continue as part
of this group and I
have tried to participate when I feel as though I have
something to contribute.
You may have noticed a recent lack of
participation.

And,
as some of you know, several months ago I started Amel
School
which gives me the opportunity to train
owners that are new-to-Amel. I also help those who want to
buy an Amel to choose
the best Amel for their budget (Pre-Purchase
Consulting).
I had my 400 page Amel
Book
printed and bound
for my Amel School clients and I provide 24/7
Support to
them. I am
proud to say that in a few months I have clients throughout
the world and just
added my 20th client. Most are members of this
Group.

This
brings me to what I need to post today. I am going to almost
totally
remove myself from the Amel Yacht Owners Forum. I need to do
this to be able to
serve my clients properly. I do hope that you understand
this. In the past few
months I have been asked by a number of you about my Amel
Book and other Amel
School related services. I have a parting offer for members
of this Yahoo Amel
Yacht Owners Group who have owned their Amels for 2 years or
longer. If you are
interested please follow this link to a hidden page on my
website: Amel
Yacht Owners Group.

Hopefully
we will meet (again) somewhere on the water while I am with
one of my Amel
School Clients. Best,



CW Bill Rouse

Admiral, Texas Navy

Commander Emeritus

Amel
School  http://www.amelschool.com

720 Winnie St

Galveston Island, TX 77550

+1(832) 380-4970










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Re: [Amel Yacht Owners] Bow locker bottoms...

Eric Freedman
 

Bill,

I bought  2 18 inch pieces of astroturf at home depot. It comes off a large 12 foot long roll.

When I am having the boat hauled it keeps the dirt off the deck and is useful for washing down the chain without scratching up the deck.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Wednesday, October 18, 2017 11:26 AM
To: amelyachtowners@...
Subject: Re: [Amel Yacht Owners] Bow locker bottoms...

 

 

James,

 

How do you lay out 100 meters of anchor chain on deck for rinsing and drying without beating the deck all to hell?  I haven't ever figured out a way to do that.

 

When I had a local fiberglass guy look at my anchor lockers to give a quote for the repair, the FIRST thing he wanted to do was add overboard drain holes to the lockers--which Super Maramus do not have.

 

I explained that on an Amel, if there is significant amounts of water coming into those lockers, something is wrong. Fix the problem (stop the water leaking in) rather than trying to fix the symptom (draining the water).  In a properly maintained bow locker on a Super Maramu, more water will come IN from an external drain than from any other source.

 

That doesn't mean the locker will be bone dry. Putting salty wet sails and lines in there will create a swamp-like environment, that's a different problem.  Keeping stuff as unsalty and as dry as possible is always a good thing--and much more challenging on a cruising boat than on a boat with a home port.

 

Bill Kinney

SM160, Harmonie

Back Creek, Annapolis, MD

Leaving for warm climes in a few days.

 

 


Stabilizing bar for Passarell

Eric Freedman
 

There is a bar that was on my Passarell that connected to the boat that prevented the passarell from swinging from port to starboard.

Would someone send me a photo of it mounted and its lengths. Mine has gone to the never land.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

Kimbertoteatoptonlinedotnet


Re: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

hanspeter baettig
 

Hi Bill 
nice decision !
Hanspeter
Tamango 2
PS:
have a lot of fun and get a lot of custstomers with your Amel School

Von meinem iPhone gesendet

Am 18.10.2017 um 20:12 schrieb 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] <amelyachtowners@...>:

 

All Amel Owners and Friends,

I have participated in this forum and with this wonderful group of people for 12 years. It has been fulfilling, educational, and occasionally entertaining.

As many of you know, we sold BeBe to great new owners, Dan & Lori Carlson, earlier this year. Many of you asked me to continue as part of this group and I have tried to participate when I feel as though I have something to contribute. You may have noticed a recent lack of participation.

And, as some of you know, several months ago I started Amel School which gives me the opportunity to train owners that are new-to-Amel. I also help those who want to buy an Amel to choose the best Amel for their budget (Pre-Purchase Consulting). I had my 400 page Amel Book printed and bound for my Amel School clients and I provide 24/7 Support to them. I am proud to say that in a few months I have clients throughout the world and just added my 20th client. Most are members of this Group.

This brings me to what I need to post today. I am going to almost totally remove myself from the Amel Yacht Owners Forum. I need to do this to be able to serve my clients properly. I do hope that you understand this. In the past few months I have been asked by a number of you about my Amel Book and other Amel School related services. I have a parting offer for members of this Yahoo Amel Yacht Owners Group who have owned their Amels for 2 years or longer. If you are interested please follow this link to a hidden page on my website: Amel Yacht Owners Group.

Hopefully we will meet (again) somewhere on the water while I am with one of my Amel School Clients. 

Best,


CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

greatketch@...
 

James,

The SM does not have any factory installed protection for the bow thruster circuit.  On my boat the fuses on the battery terminals have a total rated load of 500 Amps, which is reasonable based on the ampacity of the wire used, and has never blown while in use.

And... since I am on the boat, rather than calculating, or looking up, or guessing...  I figured a bit of measurement is in order.  With fully charged batteries (and charger off) using the Magnetronic Amp meter to measure the current draw, and my Smartguage to simultaneously display voltage,  here is what I find:

The bow thruster draws 420 Amps at 24.1 volts.  That's where it stabilized after about 5 seconds.  That's with the boat tied tightly in a slip, so any movement of the hull would (slightly) reduce the load on the prop.

It figures...  almost exactly splitting the difference between what Amel has in the manual, and what the motor nameplate says.  If it matters, this motor was just professionally overhauled last year with new brushes, windings, etc.

Bill Kinney
SM160, Harmonie
Back Creek Annapolis, MD

---In amelyachtowners@..., <lokiyawl2@...> wrote :

Bill Kinney,

   Good point about the voltage drop. I measured mine as dropping from 13.5 (charger was on so this was not an accurate test) to about 11.75 after a 5 second burst. 

   Does the SM have a breaker for the bow thruster and if so can you tell me the amperage?   I guess that the 6.3KW rating doesn’t tell us much since we don’t know how loaded the motor is.  

   Also, can someone tell me about how much free play is normal for a bow thruster?  I can rock the prop on my thruster back and forth about 3/16” without any resistance as measured from the tips of the blades.  The output shaft does not seem to have any play in it’s bearing so I assume that what I am feeling is the gear lash plus any play in the shaft to motor splines.

James Alton
SV Sueno,  Maramu #220


Re: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

Stephen Davis
 

Hi Bill,

Thank you for all the countless hours you have spent helping all of us sort out our boat issues. Best of luck with your new endeavor, and we hope to see you somewhere around the globe again. 

Aloha,

Steve and Liz Davis


Re: [Amel Yacht Owners] MAIN MAST CORROSION [3 Attachments]

Stephen Davis
 

Hi Alex,

It appears to be caused by corrosion at the base of the mast, and it appears serious. The only solution I know of is to pull the mast, and cut the corroded section out, which will shorten the mast a little. You will need a good rigger to figure out if he can compensate for the shortened mast with your existing rigging, or possibly have to put new rigging on the boat. Leaving it as is, you risk the base of the mast collapsing, and potentially causing a loss of the rig. I'm no expert, so seek professional advice from a good rigger. 

Best of luck getting it figured out. 

Regards,

Steve Davis
Aloha SM 72
Santa Marta, Columbia

Steve Davis
S/V Aloha

On Oct 18, 2017, at 4:31 PM, alex.paquin@... [amelyachtowners] <amelyachtowners@...> wrote:

 

Hello everyone,

I have a question, I am attaching 3 images of the foot of the main mast on our older Super Maramu. It is manufactured by ISOMAT. It has never been removed. Any idea why this happened and what is the remedy if any. Should we worry about this situation?


Alex Paquin

SIMPATICO

Older Maramu, Hull#94, 1981


Re: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

Dan Carlson
 

I am wishing you and Judy all the best.

But there is one thing I'm sure of:  Although we might not be hearing your voice directly on this forum in the future, we will continue to hear it echo through the posts of those you have helped and continue to help on the Amel journey.  

Many thanks,  Dan and Lori
SM #387,  sv BeBe 





On Wed, Oct 18, 2017 at 2:12 PM, 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners]
wrote:
 

All Amel Owners and Friends,

I have participated in this forum and with this wonderful group of people for 12 years. It has been fulfilling, educational, and occasionally entertaining.

As many of you know, we sold BeBe to great new owners, Dan & Lori Carlson, earlier this year. Many of you asked me to continue as part of this group and I have tried to participate when I feel as though I have something to contribute. You may have noticed a recent lack of participation.

And, as some of you know, several months ago I started Amel School which gives me the opportunity to train owners that are new-to-Amel. I also help those who want to buy an Amel to choose the best Amel for their budget (Pre-Purchase Consulting). I had my 400 page Amel Book printed and bound for my Amel School clients and I provide 24/7 Support to them. I am proud to say that in a few months I have clients throughout the world and just added my 20th client. Most are members of this Group.

This brings me to what I need to post today. I am going to almost totally remove myself from the Amel Yacht Owners Forum. I need to do this to be able to serve my clients properly. I do hope that you understand this. In the past few months I have been asked by a number of you about my Amel Book and other Amel School related services. I have a parting offer for members of this Yahoo Amel Yacht Owners Group who have owned their Amels for 2 years or longer. If you are interested please follow this link to a hidden page on my website: Amel Yacht Owners Group.

Hopefully we will meet (again) somewhere on the water while I am with one of my Amel School Clients. 

Best,


CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

Bill & Judy Rouse <yahoogroups@...>
 

Craig,

I more than anyone saw the smile n your face as you wrote this posting....

BUT....

It is more like, "The Times They are a Changin'"😀

Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970



On Wed, Oct 18, 2017 at 5:02 PM, sangaris@... [amelyachtowners] <amelyachtowners@...> wrote:
 


Hi Bill,
Glad you were able to improve on the Captain's engineering!
Cheers, Craig

---In amelyachtowners@yahoogroups.com, wrote :

Craig,

I agree with Alan's point and before we sold BeBe I had decided to place 6 of the Blue Sea 5191 MRBF Terminal Fuse Blocks with a removeable Blue Sea BS5185 (150A) amp fuse on each of the 6 positive battery pairs on the pos itive post  of the battery and connect the the positive lead for each pair to the newly installed terminal block fuse. My assumption was that the 500 amp bow thruster would not burn individual 150 amp fuses...I may be wrong on this. The fuses are available from 50 amps to 300 amps. Since the fuses are replaceable, I was going to buy extras.

Of course, I have not tested this, so I cannot say that it works and/or whether it is the best solution.

Inline image 1
Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus



Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

Craig Briggs
 


Hi Bill,
Glad you were able to improve on the Captain's engineering!
Cheers, Craig

---In amelyachtowners@..., <yahoogroups@...> wrote :

Craig,

I agree with Alan's point and before we sold BeBe I had decided to place 6 of the Blue Sea 5191 MRBF Terminal Fuse Blocks with a removeable Blue Sea BS5185 (150A) amp fuse on each of the 6 positive battery pairs on the positive post  of the battery and connect the the positive lead for each pair to the newly installed terminal block fuse. My assumption was that the 500 amp bow thruster would not burn individual 150 amp fuses...I may be wrong on this. The fuses are available from 50 amps to 300 amps. Since the fuses are replaceable, I was going to buy extras.

Of course, I have not tested this, so I cannot say that it works and/or whether it is the best solution.


Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus
720 Winnie St
Galveston Island, TX 77550
+1(832) 380-4970


Re: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

Patrick McAneny
 

Bill, You will be missed , but certainly never forgotten ! 
Thanks for Everything ,
Pat & Diane ,
SM Shenanigans


-----Original Message-----
From: 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners]
To: amelyachtowners
Sent: Wed, Oct 18, 2017 2:12 pm
Subject: [Amel Yacht Owners] The Times They are a Changin' - Message from Bill Rouse

 
All Amel Owners and Friends,
I have participated in this forum and with this wonderful group of people for 12 years. It has been fulfilling, educational, and occasionally entertaining.
As many of you know, we sold BeBe to great new owners, Dan & Lori Carlson, earlier this year. Many of you asked me to continue as part of this group and I have tried to participate when I feel as though I have something to contribute. You may have noticed a recent lack of participation.
And, as some of you know, several months ago I started Amel School which gives me the opportunity to train owners that are new-to-Amel. I also help those who want to buy an Amel to choose the best Amel for their budget (Pre-Purchase Consulting). I had my 400 page Amel Book printed and bound for my Amel School clients and I provide 24/7 Support to them. I am proud to say that in a few months I have clients throughout the world and just added my 20th client. Most are members of this Group.
This brings me to what I need to post today. I am going to almost totally remove myself from the Amel Yacht Owners Forum. I need to do this to be able to serve my clients properly. I do hope that you understand this. In the past few months I have been asked by a number of you about my Amel Book and other Amel School related services. I have a parting offer for members of this Yahoo Amel Yacht Owners Group who have owned their Amels for 2 years or longer. If you are interested please follow this link to a hidden page on my website: Amel Yacht Owners Group.
Hopefully we will meet (again) somewhere on the water while I am with one of my Amel School Clients. 
Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


MAIN MAST CORROSION

Alejandro Paquin
 

Hello everyone,

I have a question, I am attaching 3 images of the foot of the main mast on our older Super Maramu. It is manufactured by ISOMAT. It has never been removed. Any idea why this happened and what is the remedy if any. Should we worry about this situation?


Alex Paquin

SIMPATICO

Older Maramu, Hull#94, 1981


Re: [Amel Yacht Owners] NIKIMAT Illustrations & Parts for sale

Alejandro Paquin
 

Hello Alexandre,
Your descriptions and direct help in the past months have been invaluable to me and to the Group. You have documented many useful things not only for your SM but useful for other Amels. I hope you are doing better now and that you are able to sail soon again.

Alex Paquin
SIMPATICO
older Maramu #94, 1981


Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems

Ryan Meador
 

Bill K: I agree that it is a mostly theoretical concern, but you know the difference between theory and practice, right? :D  My own knowledge and sources that I trust lead me to err on the side of the simpler system, even if it is harder to source the correct fuses.

Regarding the bow thruster power: I think we have to take everything in that table with a grain of salt because none of the wattages match up with the amperages.  I think they're trying to convey something other than a strict electrical relationship between those numbers.  I wonder if the 510A value might be the inrush current, and the 7kW the continuous power?  I agree with James that "Amperage on load" probably means "under load", but implies the "amperage" column is no-load, so why aren't more of the values in the "on load" column?  The bow thruster is in essence always under load.  Another possibility is the thruster input power is ~9180W (510A * 18V), the output is 7000W, and thus the efficiency is a paltry 76%.  Does anyone have a clamp-on ammeter that would be willing to do some science (I don't trust the battery monitor to react quickly enough to get a reliable inrush current measurement)?

Thanks,
Ryan
SM 233 Iteration
Boston, MA, USA

On Wed, Oct 18, 2017 at 4:38 PM, James Alton lokiyawl2@... [amelyachtowners] <amelyachtowners@...> wrote:
 

Bill,


   Thanks for showing where you got the 500 amps from.  I am still confused about what the table is trying to tell us exactly.  I note that there are two columns, one is labeled amperage and the other is “Amperage on load” which I am guessing might mean “Amperage under load”.  

   Congratulations on the success of your school and for publishing your book.  Does your book cover all of the Amel models or is it mainly for the SM?

   Your absence on the boards will be missed by myself and I am sure others.  Best of luck with your endeavours.

James Alton
SV,  Sueno,  Maramu #220
On Oct 18, 2017, at 4:35 PM, 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] <amelyachtowners@yahoogroups.com> wrote:


Bill Kinney,

I assume that you must be asking your question to Amel, because Amel is the one that published the Super Maramu 2000 Owners Manual (page attached). 

Amps = Watts/Volts. 
Watts = Amps x Volts

So, either Amel is wrong with Watts or Amps, or both. 


On Wed, Oct 18, 2017 at 2:16 PM, greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:
 

What calculation did you do to convert 7000 Watts to 510 Amps?

P= V * A
510 Amps at 24 Volts = 12,000 Watts??

For what it is worth, the name plate on the motor on my older Super Maramu (they might not all be the same) is 6.3kW

To get a good number, for current draw you can't assume 24 Volts.  When you are drawing that much power, the voltage will drop, a lot.

For really high power draws like this, it is not unreasonable to assume as low as 18 Volts.

6,300 Watts/18 Volts = 350 Amps

If we do go with a 7000 watt rating, that's still "only" 388 amps.  A perfectly reasonable number to protect with a 500 Amp fuse.


Bill Kinney
SM160, Harmonie
Back Creek, Annapolis, MD




---In amelyachtowners@yahoogroups.com, wrote :

James,

From the Super Maramu 20 00 Owners Manual...it states 7,000 watts or 510 amps
Inline image 1
Best,



On Wed, Oct 18, 2017 at 11:53 AM, James Alton lokiyawl2@... [amelyachtowners] <amelyachtowners@...> wrote:
 

Bill,


   Is it correct that the bow thruster on the Super Maramu is 500 Amps?  And that is at 24 volts?  The thruster on my Maramu has a 100 amp breaker installed by Amel ( it has never tripped so I assume the normal draw is something below 100 amps)  and the voltage is only 12 volts so if my math is right it is about 1.5 hp which is good up to about 15 knots or so.   500 Amps at 24 volts would be about 16 hp?  Can you tell me the size of the original Amel breaker that is installed on the Super Maramu?

   Thanks for all of your past help with my Amel.  And to update you on the bow thruster leakage.  After replacing the seals as instructed, the thruster did not leak a t all this season.    The thruster has also been 100% reliable thus far and is a tremendous asset IMO.

   I will con sider adding some inline fuses to my boat as well just in case of a major short. 

Best,

James Alton
SV Sueno,  Maramu #220