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Old 05-17-2012
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A 55Ah AGM battery is enough to start a 40hp engine?

The AGM battery is this one:

AGM 12/55 | Mastervolt Marine

Model AGM-55Ah

Nominal voltage 12V
Nominal capacity (C20) 55Ah
Reserve capacity* 80 min
Number of cells per battery 6
Maximum charge current: 15.3A
Approximate weight: 17.0 kg
BCI group number 63
CCA to DIN 300A
CCA to SAE 480A

MAXIMUM DISCHARGE CURRENT

Continual discharge: 50A
Discharge time t ≤ 2min: 150A
Discharge time t ≤ 10sec: 300A

http://images.mastervolt.nl/files/ManualAGM111219.pdf

The engine this one:

Sail Drive - LDW 1404 SD - Lombardini Marine - Motori entrobordo diesel marini e gruppi elettrogeni per la nautica - Inboard diesel marine engines and generators
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