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Jump starting a narrowboat engine

If the starter battery is flat, will connecting the deep discharge domestic battery bank to the starter battery and starting the engine cause damage to the domestic battery bank?

Asked by: Colin Wilks  | 12.53pm, Monday 8 February

WW says:

Some boats have an "emergency bypass" which links togther the domestic and starter banks, in the case of insufficient current being available from the starter battery alone. very useful to consider, certainly as a long term measure.
So, as John says, the odd jump start from the combined reserves of domestic and starter circuits is fine- but try and work out why the starter battery is not charged...

Mark Langley  | 12.47PM, Tuesday 16 February

16 years is a very good life for a starter battery! You did very well to keep it going that long...!

Mark Langley  | 2.12PM, Tuesday 16 February

Readers say:

it depends on the age of your battery bank.I would use one of those chargers that you can use independently,and jump the engine from that,or use another boat

gaz bee  | 4.26PM, Tuesday 9 February


John Pownall  | 7.41PM, Tuesday 9 February

Thanks for that everyone. The battery was installed when the boat was new in 1994, so I guess I cannot complain if it stops holding its charge after 16 years.
Just in case, I think I shall install a cut out type connection between the two banks as Mark describes.

Colin Wilks  | 1.10PM, Tuesday 16 February

that's your problem batteries only last about 4 years,buy yourself new batteries then the prob will vanish.

gaz bee  | 11.18AM, Monday 22 February

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