Date   

Re: 1981 Maramu pre-survey

marklesparkle59
 

That lools so much like a large version of Sea Hobo my 1983 Sharki. One area of weakness is the aft bulkhead behind the stirage bins at the bottom of the mizzen. The bins can easily block up and stay wet or even fill and any weakness in construction or poor repair leads to the 9mm plywood bulkhead eventually rotting. I know because I replaced mine 2 years ago and now clean the drainage holes every visit.
Good luck.

Mark Porter
Sea Hobo
Sharki #96


On Wed, 6 Oct 2021, 09:25 Ben Levy, <benjamin.levy@...> wrote:
Thank you for all your reply.
Bill Rouse's pre-purchase consulting package seems like an amazing idea. Unfortunately it seems like he is no longer offering this service for Amel's older than 1988 (please correct me if I'm wrong).
Here is a link to a photo album with photos of the maramu. A mixed bag of photos we took during our first visit and the photos provided by the broker.
https://photos.app.goo.gl/vRXr1HNfMZGYdULH6

And here is the listing from the broker (in French though):
https://www.annoncesbateau.com/bateau/1981-amel-maramu-5016467/

What I could see is the following:
the lining inside is coming unglue in places (aesthetic)
the gooseneck of the mizzen is coming loose (critical)
the varnish near ONE window is pilling off (aesthetic)
I was wondering about the bolts for the winch and the stoppers showing up on top of the lining 
The engine has nearly 7000h and is original 

Couldn't find much else to complain about but I didn't take everything apart either.. planning on doing that during the next visit (which is now scheduled for Saturday).

I also know that in 2000 it went trough an extensive anti-osmosis treatment from a professional company (traitement curatif par pelage du gelcoat ... pealing of the gelcoat?)
In 2010, the mast was removed to fix an issue of electrolysis at the bottom of the mast (between the mast and the deck of the boat)
The in-mast furling was added in 2004
Fridge replaced in 2003
One blackwater tank added in 2010

That's about all I know at this stage.
Cheers,
Ben


Re: 1981 Maramu pre-survey

Ben Levy
 

Thank you for all your reply.
Bill Rouse's pre-purchase consulting package seems like an amazing idea. Unfortunately it seems like he is no longer offering this service for Amel's older than 1988 (please correct me if I'm wrong).
Here is a link to a photo album with photos of the maramu. A mixed bag of photos we took during our first visit and the photos provided by the broker.
https://photos.app.goo.gl/vRXr1HNfMZGYdULH6

And here is the listing from the broker (in French though):
https://www.annoncesbateau.com/bateau/1981-amel-maramu-5016467/

What I could see is the following:
the lining inside is coming unglue in places (aesthetic)
the gooseneck of the mizzen is coming loose (critical)
the varnish near ONE window is pilling off (aesthetic)
I was wondering about the bolts for the winch and the stoppers showing up on top of the lining 
The engine has nearly 7000h and is original 

Couldn't find much else to complain about but I didn't take everything apart either.. planning on doing that during the next visit (which is now scheduled for Saturday).

I also know that in 2000 it went trough an extensive anti-osmosis treatment from a professional company (traitement curatif par pelage du gelcoat ... pealing of the gelcoat?)
In 2010, the mast was removed to fix an issue of electrolysis at the bottom of the mast (between the mast and the deck of the boat)
The in-mast furling was added in 2004
Fridge replaced in 2003
One blackwater tank added in 2010

That's about all I know at this stage.
Cheers,
Ben


Re: Air con circulating pump

Scott SV Tengah
 

Nick 

Did you ever consider using a relay and running the pump off your 24v system? That is assuming it can handle 26-28v.

Presumably when you're running AC you're either plugged in, so your chargers are on or if you're running on inverter, it is, if anything, more efficient to run directly off the batteries vs. through the inverter.

Just a thought.

--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com


Re: Speed sensor rubber cap

Mohammad Shirloo
 

Hi  Stephan;

 

We were on a tight schedule to get to our winter berth. I did re-install the cap under water to protect the sensor. We were getting erratic speed readings afterwards. We will be hauling out next year and will address it then. Did you have an issue with your speed sensor?

 

Thanks

 

Happy Sailing;

 

 

Mohammad and Aty

B&B Kokomo

Amel 54 #099

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Stefan Jeukendrup via groups.io
Sent: Sunday, September 26, 2021 10:12 AM
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Speed sensor rubber cap

 

Hi Mohammed,

 

The function of the cap is to protect the underlying high impedance crystal on which it is glued. That keeps the water and dirt out. 

 

If your Sonicspeed still works first check AGC and resistance, see the manual in the "files" section.

 

If still ok I would not try to put the cap back. Instead you could try to fill the hole where the cap was with underwater silicone. The "art" is to make good continuous accoustic contact with the exposed crystal.

 

Hope this helps you,

 

Stefan Jeukendrup

sv Malaka Queen 

SM2k #348 @ Northern Ireland

 

 

Op 26 sep. 2021 07:41 schreef Mohammad Shirloo <mshirloo@...>:

Does anyone know the function of the rubber cap? Is this for prevention of damage or growth on the main sensor, or does it have some other functional role?

 

Respectfully;

 

 

Mohammad and Aty

B&B Kokomo

Amel 54 #099

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of CW Bill Rouse via groups.io
Sent: Sunday, September 26, 2021 12:33 AM
To: main@AmelYachtOwners.groups.io Notification <main@amelyachtowners.groups.io>
Subject: Re: [AmelYachtOwners] Speed sensor rubber cap

 

I had exactly the same issue. My sonic speed stopped working. I dove and found that I had one big barnacle on the rubber cap  When I pulled on the barnacle the cap came off.

 

Amel told me to reattach it with silicone sealant on the edges. 

 

I didn't haulout to do that and waited for about 6 months for a scheduled haul out. I replaced the cap, but Sonic Speed never worked. 

 

Good luck!

Best,

CW Bill Rouse 
Amel Owners Yacht School
+1 832-380-4970 | brouse@...
720 Winnie, Galveston Island, Texas 77550 
www.AmelOwnersYachtSchool.com 
Yacht School Calendar: www.preparetocastoff.blogspot.com/p/calendar.html


   

 

On Sat, Sep 25, 2021, 3:48 PM Mohammad Shirloo <mshirloo@...> wrote:

Our speed sensor was a bit erratic after a 3 week stay in Venice. I dove in it today to clean the rubber caps with my diving gloves. The rubber cap came off of the forward sensor and I was able to catch it before it went to the bottom. 


I need to put the cap on while in water, until we haul out next year. It appears to be just a pressure fit as I could not see any sealant. The sealant may have just worn off in the past 12 years. Any advice on how to fit it back in under water, would be appreciated.

i have added pictures of the part to be reinstalled.

thank you.

 


Re: 1981 Maramu pre-survey

Dennis Johns
 

Hi Ben,

The things you should worry about the most are those things that the previous owner(s) changed.  An '81 Maramu should be pretty basic Amel and if there were modifications, that's where problems may occur.  Without pictures of the boat it's hard to identify changes.  Are there pictures or a broker site to look at?

Dennis Johns
Libertad
Maramu #121

On Tue, Oct 5, 2021 at 3:45 PM Ben Levy <benjamin.levy@...> wrote:
Good day lucky Amel owners.
I am about to buy my first Amel, an original maramu from 1981 (hull 98). I am having a 2nd viewing of the boat tomorrow and I was wondering if any maramu owner (or former owner), had any advices regarding critical components to check or any important systems to look at? I will have a professional survey done once I have signed the sell agreement but I will first have to settle on a price. The boat is in really good neck for its age but being 40, there must be some components being ready to give up on life. Anyway, any advices would be most welcome as amel yachts are one of a kind.
Cheers,
Ben


Re: 1981 Maramu pre-survey

Larry Salibra
 

Hi Ben,

I'd highly recommend Bill Rouse's pre-purchase consulting package. He'll give you a list of pictures to take of the vessel and go through each of them and flag any issues that might exist. I worked with him throughout Sula's purchase and he enabled me to complete the purchase with peace of mind.

Larry
SM140, Sula
Hong Kong


Re: 1981 Maramu pre-survey

Roque
 

Hi Ben

 

I am sure a few Maramu owners will bring several sugestions here. 

 

Besides that, if I was buying an Amel I would certainly talk to Bill Rouse first. 

 

He will answer all your questions and then some. He will either save some money or steer you away from a headache desguised as a boat. 

 

Hope it helps

--
Roque
Attika A54 117
Paraty - Brazil


Re: A54 floor boards

Ruslan Osmonov
 

Thank you Ann-Sofie and Martin, very much appreciated. 
Special thank you to Joel, that was very informative and insightful. 


1981 Maramu pre-survey

Ben Levy
 

Good day lucky Amel owners.
I am about to buy my first Amel, an original maramu from 1981 (hull 98). I am having a 2nd viewing of the boat tomorrow and I was wondering if any maramu owner (or former owner), had any advices regarding critical components to check or any important systems to look at? I will have a professional survey done once I have signed the sell agreement but I will first have to settle on a price. The boat is in really good neck for its age but being 40, there must be some components being ready to give up on life. Anyway, any advices would be most welcome as amel yachts are one of a kind.
Cheers,
Ben


Re: A54 floor boards

amelforme
 

I should have made mention that the Amel Design Team that created the Amel 54 was capably orchestrated and entirely overseen by Amel’s then chairman. Jean Jacques Lemonnier. Jacques Carteau did manage the design details and much of the construction, but would not add his name as the designer. A very modest guy without much of an ego to get in his way.

 

All the best,

Joel

 

           JOEL F. POTTER ~ CRUISING YACHT SPECIALIST, L.L.C.

                                         The Experienced AMEL Guy

UNSURPASSED AMEL MARKETING EXPERIENCE AND PRODUCT KNOWLEDGE

                                  Office 954-462-5869  Cell 954-812-2485

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of amelforme
Sent: Tuesday, October 5, 2021 4:58 PM
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] A54 floor boards

 

Ruslan, good questions all and the answers will tell a bit about how things evolved at Amel. Originally, the SM 53 had plywood floor boards that were covered with a rather thin layer of teak veneer. The “caulking lines” between the “planks” were drawn with an industrial version of the Magic Marker. Near the end of the last century, Captain Amel was fully retired and living in the south of France near Amel’s base in Hyeres. Every year he would make a visit to the shipyard in La Rochelle. As all the managers of the company were enjoying their new found full freedom of operations with Captain Amel out of sight/out of mind, each time he would visit there was more than a little apprehension about how The Captain might react to any evolutions they had made to HIS design.

Again, Captain was fully retired and had no legal sway at Amel, as if that would make a difference to this larger-than-life man.

 

All of us who knew him were familiar with his ‘my way or the highway’ disposition. He was not to be trifled with. What he said was absolute law even when he was ‘retired’. Anyway, shortly after he arrived, he made an announcement that the lifting floor boards in the saloon were henceforth going to be made of fiberglass with a molded in non-skid and a hinge to position them. He then added that they were to be French Blue in color. I was not in France at the time, but my colleagues at the shipyard who were there were in shock. No way they wanted to do this. They knew, however, they had no choice . So, the Blue Floors, as we called them, were introduced as an evolution of the Super Maramu Millennium series. I could relate a few more interesting stories about the French Blue Floors. Maybe another time…

 

The Amel 54 was the first Amel designed without the assistance of Captain Amel. It was done by a group of Amel people/The Amel Design Team, under the guidance of Jacques Carteau, Captain Amel’s right hand man and, in many respects, his eyes as well. Carteau was the guy who took the Captain’s thoughts and turned them into the design drawings almost since the beginning of Chantiers Amel. It has often been said that the Amel 54 was the last Amel boat that had entirely Captain Amels DNA in it even though he had nothing to do with it. All the department managers had been selected by Henri Amel. Jacques Carteau was the guy who drew and engineered the plans on almost every previous Amel boat. All Captain Amel disciples at the top of their craft. What a team that was to work with! Personally, these were some of the best days of my life.

 

Without the Captain looking over their shoulders, all involved were free to incorporate what our customers were asking for. Stall showers, a ‘real washer and dryer, every port openable and plenty more of them, an even better and more ergonomic galley and navigation station, a standard centerline queen able to be converted into two snug sea berths ( optionally ) and dozens more improvements and evolutions. However, it was instantly recognizable as an Amel in any harbor.

 

The Amel 54 floors have a plywood core with a textured non-skid and a faux teak pattern. It is actually a FORMICA Brand marine division product and is very durable with the exception of the strips on the side which often become unglued from the plywood.

 

The second windlass on the Amel 54 was actually an option from the beginning. All of our demonstration boats, mine included, had dual windlasses so naturally it follows that the customers wanted another windlass too. The slight negative to the second windlass was, that on some boats, the secondary anchor would not get deployed very often. Mechanical things like maintenance and exercise in equal measure. Be sure to aggressively test the second/port side windlass during any survey of a prospective Amel 54.

 

All the best,

Joel

 

           JOEL F. POTTER ~ CRUISING YACHT SPECIALIST, L.L.C.

                                         The Experienced AMEL Guy

UNSURPASSED AMEL MARKETING EXPERIENCE AND PRODUCT KNOWLEDGE

                                  Office 954-462-5869  Cell 954-812-2485

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Ruslan Osmonov
Sent: Tuesday, October 5, 2021 2:11 PM
To: main@AmelYachtOwners.groups.io
Subject: [AmelYachtOwners] A54 floor boards

 

[Edited Message Follows]

Quick question if I may, are A54 floor boards made from wood or some faux wood? If wood curious to know why SM2K were done in GRP and later went back to wood panels. 
I like GRP on SM2K, I feel wood panels will need constant maintenance given salt water and foot traffic environment. 

On the other hand I see A54s pics with floor boards in a good shape, is there a trick at keeping them "like new"?

and one more
- I noticed that later models have one windlass, what is the reason to go from 2 to 1? I would assume the 2 windlass setup was for some good reasons to start with, but not sure why the switch back. 

Regards, 
Ruslan. 

(still looking for one)


Re: A54 floor boards

amelforme
 

Ruslan, good questions all and the answers will tell a bit about how things evolved at Amel. Originally, the SM 53 had plywood floor boards that were covered with a rather thin layer of teak veneer. The “caulking lines” between the “planks” were drawn with an industrial version of the Magic Marker. Near the end of the last century, Captain Amel was fully retired and living in the south of France near Amel’s base in Hyeres. Every year he would make a visit to the shipyard in La Rochelle. As all the managers of the company were enjoying their new found full freedom of operations with Captain Amel out of sight/out of mind, each time he would visit there was more than a little apprehension about how The Captain might react to any evolutions they had made to HIS design.

Again, Captain was fully retired and had no legal sway at Amel, as if that would make a difference to this larger-than-life man.

 

All of us who knew him were familiar with his ‘my way or the highway’ disposition. He was not to be trifled with. What he said was absolute law even when he was ‘retired’. Anyway, shortly after he arrived, he made an announcement that the lifting floor boards in the saloon were henceforth going to be made of fiberglass with a molded in non-skid and a hinge to position them. He then added that they were to be French Blue in color. I was not in France at the time, but my colleagues at the shipyard who were there were in shock. No way they wanted to do this. They knew, however, they had no choice . So, the Blue Floors, as we called them, were introduced as an evolution of the Super Maramu Millennium series. I could relate a few more interesting stories about the French Blue Floors. Maybe another time…

 

The Amel 54 was the first Amel designed without the assistance of Captain Amel. It was done by a group of Amel people/The Amel Design Team, under the guidance of Jacques Carteau, Captain Amel’s right hand man and, in many respects, his eyes as well. Carteau was the guy who took the Captain’s thoughts and turned them into the design drawings almost since the beginning of Chantiers Amel. It has often been said that the Amel 54 was the last Amel boat that had entirely Captain Amels DNA in it even though he had nothing to do with it. All the department managers had been selected by Henri Amel. Jacques Carteau was the guy who drew and engineered the plans on almost every previous Amel boat. All Captain Amel disciples at the top of their craft. What a team that was to work with! Personally, these were some of the best days of my life.

 

Without the Captain looking over their shoulders, all involved were free to incorporate what our customers were asking for. Stall showers, a ‘real washer and dryer, every port openable and plenty more of them, an even better and more ergonomic galley and navigation station, a standard centerline queen able to be converted into two snug sea berths ( optionally ) and dozens more improvements and evolutions. However, it was instantly recognizable as an Amel in any harbor.

 

The Amel 54 floors have a plywood core with a textured non-skid and a faux teak pattern. It is actually a FORMICA Brand marine division product and is very durable with the exception of the strips on the side which often become unglued from the plywood.

 

The second windlass on the Amel 54 was actually an option from the beginning. All of our demonstration boats, mine included, had dual windlasses so naturally it follows that the customers wanted another windlass too. The slight negative to the second windlass was, that on some boats, the secondary anchor would not get deployed very often. Mechanical things like maintenance and exercise in equal measure. Be sure to aggressively test the second/port side windlass during any survey of a prospective Amel 54.

 

All the best,

Joel

 

           JOEL F. POTTER ~ CRUISING YACHT SPECIALIST, L.L.C.

                                         The Experienced AMEL Guy

UNSURPASSED AMEL MARKETING EXPERIENCE AND PRODUCT KNOWLEDGE

                                  Office 954-462-5869  Cell 954-812-2485

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Ruslan Osmonov
Sent: Tuesday, October 5, 2021 2:11 PM
To: main@AmelYachtOwners.groups.io
Subject: [AmelYachtOwners] A54 floor boards

 

[Edited Message Follows]

Quick question if I may, are A54 floor boards made from wood or some faux wood? If wood curious to know why SM2K were done in GRP and later went back to wood panels. 
I like GRP on SM2K, I feel wood panels will need constant maintenance given salt water and foot traffic environment. 

On the other hand I see A54s pics with floor boards in a good shape, is there a trick at keeping them "like new"?

and one more
- I noticed that later models have one windlass, what is the reason to go from 2 to 1? I would assume the 2 windlass setup was for some good reasons to start with, but not sure why the switch back. 

Regards, 
Ruslan. 

(still looking for one)


Re: A54 floor boards

Martin Birkhoff
 

Hi Ruslan,

the floor boards of our 54 are made of panels of plywood. The surfaces of the panels are coated by synthetic material. More or less undestroyable. It may happen that the edges become loose after years but they can be glued to the plywood again easily. For design reasons Amel added some wood mouldings (mahagony). After 15 years of use these mouldings do not need any maintenance. (You could treat them with furniture polish.)

As long as I know the second windlass was an extra. But I´m not sure. The strange thing when we got our boat in 2016 was: Obviously the second windlass was never connected to the batteries and it never was mounted to the deck correctly. When I dismounted the windlass I discovered a gap of 8 mm between the GRP of the deck and the gearbox of the windlass completely filled with aluminum oxide. 

Regards
Martin
Mago del Sur - 54#40
currently Mahon, Menorca


Re: A54 floor boards

Ann-Sofie, S/Y Lady Annila <ann-sofie@...>
 

We have all wooden floors on our SM 232, from 1998. There is no particular maintenance on it. We  have oiled it once or twice since 2006 when we bought Lady Annila. No trouble with footprints and we wash it with normal floor cleaning liquid  and water. 

SM2k also have wooden floor except on the steps on the ”ladder” and the lid to the floor compartments that is made of GRP.

Regards
Ann-Sofie & Jonas
S/Y Lady Annila SM232, 1998
In Portimão, Portugal


Skickat från min iPhone

05/10/2021 kl. 20:10 skrev neurolept2 <TC215@...>:


Sorry,  sent to wrong group.


From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> on behalf of neurolept2 <TC215@...>
Sent: Tuesday, October 5, 2021 15:09
To: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io>
Subject: Re: [AmelYachtOwners] A54 floor boards
 
I am heading out and will be back this evening some time.


From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> on behalf of Ruslan Osmonov <rosmonov@...>
Sent: Tuesday, October 5, 2021 14:10
To: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io>
Subject: [AmelYachtOwners] A54 floor boards
 

Quick question if I may, are A54 floor boards made from wood or some faux wood? If wood curious to know why SM2K were done in GRP and later went back to wood panels. 
I like GRP on SM2K, I feel wood panels will need constant maintenance given salt water and foot traffic environment. 

On the other hand I see A54s pics with floor boards in a good shape, is there a trick at keeping them "like new"?

 

Regards, 
Ruslan. 

(still looking for one)


Re: A54 floor boards

neurolept2
 
Edited

Quick question if I may, are A54 floor boards made from wood or some faux wood? If wood curious to know why SM2K were done in GRP and later went back to wood panels. 
I like GRP on SM2K, I feel wood panels will need constant maintenance given salt water and foot traffic environment. 

On the other hand I see A54s pics with floor boards in a good shape, is there a trick at keeping them "like new"?

 

Regards, 
Ruslan. 

(still looking for one)

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> on behalf of neurolept2 <TC215@...>
Sent: Tuesday, October 5, 2021 15:09
To: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io>
Subject: Re: [AmelYachtOwners] A54 floor boards
 
I am heading out and will be back this evening some time.
 
 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> on behalf of Ruslan Osmonov <rosmonov@...>
Sent: Tuesday, October 5, 2021 14:10
To: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io>
Subject: [AmelYachtOwners] A54 floor boards
 

Quick question if I may, are A54 floor boards made from wood or some faux wood? If wood curious to know why SM2K were done in GRP and later went back to wood panels. 
I like GRP on SM2K, I feel wood panels will need constant maintenance given salt water and foot traffic environment. 

On the other hand I see A54s pics with floor boards in a good shape, is there a trick at keeping them "like new"?

 

Regards, 
Ruslan. 

(still looking for one)


Re: Climma air conditioning unit

Barry Connor
 

Hi Paul, 
My problem was sea growth in the pipes. Had the local very knowledgeable Caraibe Refrigeration run an acid mixture round the A/C and Refrigeration pipes, took a few hours. Unbelievable difference. Don’t think it has ever been done since 2006.
Sorry they couldn’t give me any advice about your fan issue. Good that you got someone local. Where is Fortunate? 
Best 
Bazza


On Oct 5, 2021, at 10:05, Paul Brown <feeder.brown@...> wrote:

Hi

My fwd and two saloon systems are compact and my aft system is a split system all with independent fans. I have had technical advice from a service technician that inspected the issue and he believes it is a faulty relay. He suggests a new control board or if possible to have the relay replaced.

I am hoping to have the faulty relay replaced as a new board is an expensive solution but maybe my only option.

thank you for your response 

regards Paul- Fortuna II Amel 55 #17


Re: Climma air conditioning unit

Paul Brown
 

Hi

My fwd and two saloon systems are compact and my aft system is a split system all with independent fans. I have had technical advice from a service technician that inspected the issue and he believes it is a faulty relay. He suggests a new control board or if possible to have the relay replaced.

I am hoping to have the faulty relay replaced as a new board is an expensive solution but maybe my only option.

thank you for your response 

regards Paul- Fortuna II Amel 55 #17


Re: What to do with LiFePO4 batteries when the boat is layed up?

Scott SV Tengah
 

Joerg,

Avoiding charging the batteries to 100% during normal use is a completely different conversation than whether to leave batteries at high SOC or 50% SOC during wintering/long term storage. I know that Victron and likely Mastervolt do NOT charge to 100% even during normal use. It's obvious if you look at the absorption voltages preset by Victron lithium charging profiles and then compare it to what is considered 100% charged. I surmise that it's the same with Mastervolt, so the respective battery monitors are telling you it's 100% when it's really in the low-mid 90% SOC. They do this because the additional capacity going between 90%-100% SOC is more than offset by the faster deterioration of the batteries. 

Regarding Mastervolt batteries "being different in design from other manufacturers batteries", I am a bit skeptical considering actual product teardowns indicate that they use Winston prismatic cells, just like Victron and just like the guy who spent a fraction of what we spent for our batteries. A not-so-hidden secret of these expensive batteries is that they use the same Chinese cells that others get at a 75% discount to build their own homebrew lifepo4 batteries. Of course, the internal connections, BMS system, warranty and hence safety and reliability are theoretically better and the system is more integrated, which is why I paid a premium for my Victrons. But I'd be very skeptical when the guy selling you the batteries at a huge profit tries to tell you that theirs is different somehow. I am under no illusion that the battery cells in my Victrons or your MV are made of unobtanium or handbuilt by an MIT engineer - they are Chinese Winston prismatic cells that are subject to the same limitations.

Trying to achieve a desired SOC by specifying voltage is difficult for reasons mentioned earlier. By setting a lower float voltage, I believe that all you're doing is setting the lower limit of voltage that the batteries will go to while connected to the charger. The absorption voltage/duration is really what determines the high SOC limit. Give it a try and set your float voltage to 24v and see if it still charges to 78%.

Let me try to dig up those papers for you. Here are the results of a simplified test that is much less dry.


To be fair, he's comparing 50% vs. 100% SOC but it's probably safe to assume that the damage associated with high SOC storage is not a step function. 

At the end of the day, it's our individual boats, so we must do what we think is best. I find these engineering guys sometimes cross the border into marketing, so I always trust, but verify through objective means.

On Mon, Oct 4, 2021 at 7:16 PM Joerg Esdorn via groups.io <jhe1313=yahoo.com@groups.io> wrote:
I have discussed the issue with a senior technician at MV support.  His explanation for the recommendation to keep the batteries at 100% with a float voltage of 27.0V was that their batteries are different in design from other manufacturers' batteries.  They are made for being kept at full charge over long periods.  I further asked him if I wanted to keep them at a lower SOC, how to achieve that.  His response was to change the float voltage to 26.5 from 27.0V rather than program an event that turns the charger off at 80% SOC.  The event will result in a lot of switching which would be avoided with the adjustment of the float voltage.   I've tried to do this and the SOC essentially goes to about 78% with the charger connected.  So presumably you could set the float voltage to even less than 26.5V and end up with a SOC lower than 78%.  

I would be very interested in seeing the research paper(s) showing what the best SOC for long term storage is.  I am very hesitant setting the SOC for the winter at lower than 80% because of the risk that something will go wrong with the charger and the battery will go to the 20% cutoff point.   I also wonder whether it's worth avoiding charging the batteries to 100%.  I bought these batteries among other things to have much more capacity available than before.  I really don't want to restrict the range of SOC I can use to get some uncertain benefit on longevity.  MV says the batteries are good for 2000 cycles.  My Easyview monitor tells me I've used up 23 of those over the last 3 months on the boat.   At that rate, I will kick the bucket before the batteries!  

Joerg Esdorn
A55 Kincsem
Currently cruising Brittany

 


--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com


Re: Air con circulating pump

Stefan Schaufert
 

Dear Nick,

thx a lot for your fast response.

To the forum:
Does anyone else use Domaire pumps?
If so, how satisfied are you?

Best regards
Stefan
A54 #119 Lady Charlyette, currently La Palma - Canaries


Re: Climma air conditioning unit

Arno Luijten
 

Hi Bill,

If he would have the chiller system, that unit would not carry a fan. So either his fan unit in the saloon is broken or he has the stand alone units.
I seem to remember the early 55’s had the same system as the 54 and SM. The later models had a central chiller unit.
Remains the fact that he should get technical expertise as there many potentials causes for this problem.

Kind regards,

Arno Luijten
SV Luna,
A54-121


Re: What to do with LiFePO4 batteries when the boat is layed up?

Joerg Esdorn
 

I have discussed the issue with a senior technician at MV support.  His explanation for the recommendation to keep the batteries at 100% with a float voltage of 27.0V was that their batteries are different in design from other manufacturers' batteries.  They are made for being kept at full charge over long periods.  I further asked him if I wanted to keep them at a lower SOC, how to achieve that.  His response was to change the float voltage to 26.5 from 27.0V rather than program an event that turns the charger off at 80% SOC.  The event will result in a lot of switching which would be avoided with the adjustment of the float voltage.   I've tried to do this and the SOC essentially goes to about 78% with the charger connected.  So presumably you could set the float voltage to even less than 26.5V and end up with a SOC lower than 78%.  

I would be very interested in seeing the research paper(s) showing what the best SOC for long term storage is.  I am very hesitant setting the SOC for the winter at lower than 80% because of the risk that something will go wrong with the charger and the battery will go to the 20% cutoff point.   I also wonder whether it's worth avoiding charging the batteries to 100%.  I bought these batteries among other things to have much more capacity available than before.  I really don't want to restrict the range of SOC I can use to get some uncertain benefit on longevity.  MV says the batteries are good for 2000 cycles.  My Easyview monitor tells me I've used up 23 of those over the last 3 months on the boat.   At that rate, I will kick the bucket before the batteries!  

Joerg Esdorn
A55 Kincsem
Currently cruising Brittany

 

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