Re: Battery bank problems SM with 13 batteries

seafeverofcuan <seafeverofcuan@...>

Hi Eric,
I am sitting in San Carlo Mexico looking at my battery box which has four very poor Vetus batteries left. They are eighteen months old.
On passage across The Sea of Cortez last week we had exactly the same problem as you. We have been unable to find twelve deep cycle 105 to 110 amp hour replacement batteries here and have picked out the best four that we had left, which are at best,very suspect .
We were running our Yanmar engine @ 2500rpm and after seventy miles or so of motoring we noticed that horrible sulphur smell, when I checked the battery box it was very hot and immediately disconnected the alternator drive belts and turned every electrical 24 volt appliance on.
My thoughts are that we had an open short from overheating in one of the batteries and it brought down the rest.
The offending battery was at 65C and rising even while disconnected so I removed it and the other hottest ones from the boat.
Judging from the volume of correspondence in this Forum, Amels do seem fraught with battery problems, but mostly from over charging with Dolphin chargers, my chargers are original and seem fine so far. The regulator on the alternator appears to give out the correct voltage also.
When last in La Rochelle I asked Olivier Beaute should I change to AGM or gel, his response was a very firm 'NO' . He claimed that Amel really didn't know why they wouldn't work properly on their boats?
Certainly once overheated they are destroyed. From my own experience the people that I have met across the Caribbean and Pacific who have had battery problems all promote Trojan wet cell as the most robust and value for money.
I would welcome if someone could tell me other than drilling a hole into each battery cell how you actually put water back into a sealed low maintenance battery, I have tried opening my Vetus batteries and the tops are sealed on by vibration heat sealing and therefore permanently sealed to the base?
I am much inclined to agree with Ian Jenkins, Pen Azen when he says that he now regards batteries as an item that has to be regularly replaced.
On this occasion I intend to research heat sensor probes fitted to the terminals which I understand Xantrex and Mastervolt may have developed.
Kind regards,
Trevor Lusty
Sea Fever of Cuan

--- In amelyachtowners@..., "eric" <kimberlite@...> wrote:

On our trip home from St Martin last week, we discovered that most of the liquid in all the sealed maintenance free batteries had boiled off. I did not realize that under the labels there are plugs where water can be added. In any event all the house (12) batteries
have to be replaced.
We have a 175 amp alternator and 30 and 100 amp Dolphin chargers.
I spoke with Dolphin and they said that the 30 amp charger is too small for the bank and it probably cooked the batteries as it saw the bank as always needing a charge. I plan on having the alternator checked and then speak again with Dolphin when I install the new batteries.

Kimberlite usually is in a marina somewhere and plugged in with the 30 amp charger running.
Any thoughts on my problem?
Fair Winds
Amel Super Maramu #376 Kimberlite

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