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Old 05-11-2011, 04:48 PM   #1
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Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
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What size batteries?

What size batteries would be needed for a twin gm 6.5 diesel setup?
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Old 05-11-2011, 06:12 PM   #2
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Boat make: 20ft lenght of boat
Engines: 150 Bee-fff VTEC
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Take the BIG ones.
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Old 06-11-2011, 10:06 AM   #3
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Country: Spain
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Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med

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Something like these?
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Old 06-11-2011, 10:09 AM   #4
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Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med

Join Date: Nov 2006
Location: Mallorca
Posts: 716
Now seriously please.
Is anyone running these engines and has any experience with the power rating needed to start these?

Would I be better with one for each engine or two for each engine?

I am planning the engine bay layout and would need t allow for the batteries.

Thanks

Peter
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Old 06-11-2011, 11:53 AM   #5
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Each engine its own isolated heavy battery i should say.

But always connect minus battery tot battery, and double ground engine to engine
Very important, to avoid electrical circuits flowing high amps through tiny cable sections, immidiatly burning them.

With one dead you will never get in problems with double heavy ones.

Two light batterys parralel connected, will fire one egine easily and also the second and so will save you weight
Assume saving small money thhroug light batterys isnt your worry.

On a Marine i avoid connectors / couplings as much as possible, they corrode on age and will give you failure sooner or later.

Think the GM's are mild compression, look what the GM cars use and ad 30 or 50amps for marine.

I gues 120.
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Old 06-11-2011, 04:53 PM   #6
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Country: Spain
Location: Mallorca
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Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med

Join Date: Nov 2006
Location: Mallorca
Posts: 716
Hi Bokito,

Thanks for the input. I'm not too worried about the weight and I've found that trying to save money usualy costs more, in the long run.

I was thinking along the lines of the 2 x 900 cca batteries, Any ideas? I was also thinking of using type of split charger system, as each engine has it's own alternator would this be a problem?

I'm sure there must be someone on this forum who is running something like these engines, maybe they have not seen this thread yet?

Thanks

Peter
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Old 06-11-2011, 08:21 PM   #7
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Isn't JF running similar engines in the 28? He'd be a good one to ask!
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Old 07-11-2011, 07:55 AM   #8
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We run three on the race boat - with a split charging system they run independently for the two starter batteries both charging the third which runs the domestics and dashboard.

This will connect it all up: BEP switches

Not sure exactly what size you'll need I'm afraid.
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Old 07-11-2011, 08:25 AM   #9
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Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med

Join Date: Nov 2006
Location: Mallorca
Posts: 716
Quote:
Originally Posted by larby View Post
Isn't JF running similar engines in the 28? He'd be a good one to ask!
Hi Larby, long time. I think JF is running similar engines, not sure how similar though as these are built to Peninsular spec and I believe that they play with the compression a bit .

Maybe JF will give me some idea of what he has found to work well with his motors.

Thanks

Pete
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Old 07-11-2011, 08:29 AM   #10
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Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med

Join Date: Nov 2006
Location: Mallorca
Posts: 716
Quote:
Originally Posted by Cookee View Post
We run three on the race boat - with a split charging system they run independently for the two starter batteries both charging the third which runs the domestics and dashboard.

This will connect it all up: BEP switches

Not sure exactly what size you'll need I'm afraid.
Hi Cookee, You must have read my mind. I was looking at those switches, from another thread on here. I was thinking of a third battery as she has an anchor winch, on top of the usual electrics.

Maybe someone will come up with the size needed or some way to calculate what size is needed.

Thanks

Pete
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