Re: [Amel] Re: Batteries reconfiguration

Paul LaFrance <pflafrance@...>

We do have 13 batteries. The engine one has the higher Cranking output that is not on the other 12 batteries as they are deep charge batteries.
I believe part of this discussion started when we reviewed Nigel's writings on batteries in numerous sail articles with the crew on board.
The impeller vice grips you sent work perfectly
Paul & Sue

Date: Sun, 28 Jun 2009 17:26:04 +0000
Subject: [Amel] Re: Batteries reconfiguration

Hi Paul & Sue:

Both you and Vito mentioned that you have 12 batteries in your house bank (13 total

including the starting battery). Is this correct? My boat (Amel SM 2000 hull # 335 has 9

total bateries). Perhaps you could verify this, but I suspect that you have only 9 total.

Nevertheless, your friend's observation is interesting. If I put in 8 Trojan SCS225 (12 volt

225 amp hour) batteries for my house bank this would yield 900 amp hours at 24 volts

DC which would make your recommendation even more cogent. I might have to do a

little digging in Nigel Calder's book to see what he recommends. I would be very

interested in hearing from Joel on this as he might be able to shed some light on Amel's

logic for their design.

Regards, Gary Silver

s/v Liahona on the hard in Jolly Harbor Antigua

--- In, "Paul" <pflafrance@...> wrote:

We recently had on board an electrician a retired navy commander for subs for our trip north. They reviewed our charging system (Engine 100 & 30 Amp alternators) and the Genset 100 amp outputs for our 12 battery Delco bank that has 840 Amp/Hours.
They recommended that we split the existing battery bank of 12 batteries into 2 separate banks with a switch to better control charging. It appears Amel built the vessel for charging a 400 Amp/hour battery bank.
They indicated that the current charging system is not sufficient for the existing battery bank of 12 batteries.
They noted that the 2 separate banks would provide sufficient power for a days use based on our consumption levels.
Further benefits would be that the one bank not in use would have a days rest and could be recharged in a shorter time than the full bank. They recommended using Bank #1 on odd days and Bank #2 on even days.
The other benefit would be that when the need arises to replace the batteries only one bank would have to be done at a time if only a few batteries failed by moving them around.
Has anyone done this or had similar thoughts.
I am not an electrical person and batteries are not something I am fully conversant with but I'm learning.
Paul & Sue
SM #362

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