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Old 17-08-2008, 04:33   #151
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I am looking at the Valence Lithium polymer batteries, does anyone know exactly how they need charging? i.e. can I use a traditional 3 step charger?


Alan
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Old 17-08-2008, 04:36   #152
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I am looking at the Valence Lithium polymer batteries, does anyone know exactly how they need charging? i.e. can I use a traditional 3 step charger?


Alan
Hallo Alan just contact Neill Parkinson Neill.Parkinson@Valence.com at Valence and he will help you with the special chargers needed

Greetings and have a good sunday

Gideon
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Old 17-08-2008, 04:42   #153
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Thanks Gideon.


Cheers

Alan

P.S. do you carry stock of these in SA?
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Old 17-08-2008, 04:45   #154
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Yes we carry some stock but not to many since they are expensive and we do not want to keep them in stock a long time
How many would you need and when ?
You would also need a BMS ( battery monitoring system with them made by valence )

Gideon
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Old 17-08-2008, 04:47   #155
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8 pcs.

Next august.


Thanks

Alan
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Old 17-08-2008, 04:50   #156
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8 pcs.

Next august.


Thanks

Alan
8 pieces is a lot of house bank power giving you almost 1100 amps of usable power
Next year a new version will come out that is 20 % less in weight and 25 % more usable power at a (presumable ) lower cost so hold of as long as you can

Have you started building already ?
Gideon
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Old 17-08-2008, 04:56   #157
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Have you started building already ?
Interesting, tell us Nordic Cat!
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Old 17-08-2008, 05:10   #158
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Sorry Guys, not yet.

My schedule is something like this.

Contract signed before Sept. 1st 2008

Moulds and bulkeads ready mid-december.

Dec-jan . holidays at yard.

February - hulls infused

September-October 2009 -launch, seatrials and delivery.


I'm working on finalising the mast design and line runs, as well as ironing out choices and requirements for the electric systems that will be CAN-Bus based. Probably going for Mastervolts system, and maybe adding a micro controller to be able to add some control functions, and data aquisition to optimise reefer sysytems, etc.
Engine controls will also be CAN bus.

cheers

Alan
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Old 17-08-2008, 05:44   #159
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Sorry Guys, not yet.

My schedule is something like this.

Contract signed before Sept. 1st 2008

Moulds and bulkeads ready mid-december.

Dec-jan . holidays at yard.

February - hulls infused

September-October 2009 -launch, seatrials and delivery.


I'm working on finalising the mast design and line runs, as well as ironing out choices and requirements for the electric systems that will be CAN-Bus based. Probably going for Mastervolts system, and maybe adding a micro controller to be able to add some control functions, and data aquisition to optimise reefer sysytems, etc.
Engine controls will also be CAN bus.

cheers

Alan
I am glad you have chosen the infusion route . much more controllable resin quantity,s and no chance on delamination , are you infusing with epoxy ?
I was not very happy with Mastervolt , not very reliable , we have switched to Victron and have no more reliability issues.
For the Buss system we use the Capi 2 system and are very happy with it.
big weight and time saver.
Capi2 is a smart, easily accessible bus-based power supply system.
Victron Energy - Inverter/chargers - Inverters - Battery Chargers - and more

Are you using glass , carbon fiber or Basalt fiber in combination wit Twaron ?

Greetings

Gideon
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Old 17-08-2008, 05:49   #160
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I did actually try saying those "No's" to SWMBO tonight and her response was she agreed straight away!!! She said she had no need for dishwashers and washing machines because she has ME!!!!! She did say to stock up on the Marigold gloves as I will be using them a lot!!!
Gludy,
I missed this when you first posted this. I admire your courage, whilst questioning your sanity
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Old 17-08-2008, 06:00   #161
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Can you give us a link or two for these batteries? I can't seem to find any. Thanks!
Before getting really excited about these batteries, I suggest you look at this link

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Old 17-08-2008, 06:01   #162
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Hallo Alan

If there is a way for me to help you let me know.
Where are the builders located in South Africa ?

Greetings and good luck in your venture to build a beautiful fast cruising catamaran.

Gideon
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Old 17-08-2008, 06:08   #163
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Before getting really excited about these batteries, I suggest you look at this link

Very nice explosion , we do however use a different technique in the used Lithium Ion Phosphate batteries , and have you ever short circuited a lead acid battery ?

Valence Safety Video

greetings

gideon
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Old 17-08-2008, 06:17   #164
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I do welcome the concept of the electric motors, but have grown increasingly uncomfortable with the continuous emphasis on large battery capacity and recharging when sailing. To my mind all of this is achieveing three things that are really bad for the cruiser:

It makes the boat a lot heavier, when it should have been a lot lighter (battery weight).
It makes the electric system very complex.
battery capacity constrains the power output and causes significant problem when motoring for any distance.

To my simple mind, a hybrid system is much more simple and offers significant weight savings.

By hybrid, I mean the installation of a purpose designed generator, that is used for engine drive. It is then available for battery charge and running AC. A single generator would be a simple installation, and the battery weight savings would be substantial. You also avoid all that speed reduction by being able to use folding props.


As another idea for weight saving, has anybody investigated the use of titanium anchor chain - A very quick look suggests that it is less susceptible to corrosion, and strength to weight is much superior, hence possibility of reducing the weight - of course that would have a knock on effect of reducing the effectiveness of the anchor system.
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Old 17-08-2008, 06:29   #165
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As another idea for weight saving, has anybody investigated the use of titanium anchor chain - A very quick look suggests that it is less susceptible to corrosion, and strength to weight is much superior, hence possibility of reducing the weight - of course that would have a knock on effect of reducing the effectiveness of the anchor system.
Has anybody used LEADED ROPE instead of using chain or use it and reduce the amount of chain carried to lose weight?
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