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Old 29 September 2006, 06:44   #1
Country: UK - Wales
Make: Osprey
Length: 7m +
Engine: outboard
Join Date: Oct 2004
Posts: 66
Twin Engine to battery isolator


This winter sees me changing my manual start outboards to electric starts and wondered if the two engines can I use a single isolator ? thus both engines will be connected through one isolator to the start battery. There is a 100A fuse / breaker at the battery.

The second battery will serve the gps/vhf/etc.

The engines are Mariner 40ís and have a manual start option in case of battery failure.

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Old 29 September 2006, 07:33   #2
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,045
I don't think there is a problem with the engines in general but I'm not sure how the two voltage regulators with work in parallel. One is bound to have a slightly higher output voltage than the other and this one might do all the charging. Hence you may think you've got X charging capacity but you may only have half of that.

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Old 29 September 2006, 08:06   #3
Pete7's Avatar
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,865
Why not fit twin batteries and have two completely independant systems ? twin 40s will only require small batteries.

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Old 29 September 2006, 09:27   #4
Simon B's Avatar
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
I'd be with Pete, dual isolators would give complete separation.
New boat is here, very happy!
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