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Old 06 November 2012, 09:51   #71
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You've confused me . You need to be careful that you don't have two sources of power available to your nmea network otherwise, if you forget to turn one of the switches on/off then there is a risk you might start charging one of your batteries via the nmea backbone which would not be good. You could I suppose have two separate backbones, each powered independantly and just have the data wires connected between the two. This would allow you to have an engine backbone for gauges and a navigation backbone for nav electronics. They could share data but not the power sources.
Yes, yes, if you had a Suzuki you could do that. Alternatively, as explained above by Chris and then by me, get a multi engine NMEA2000 power cable, no switches involved!

NMEA 2000 question. - Owners Message Board
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Old 06 November 2012, 10:14   #72
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Alright smartarse!
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Old 06 November 2012, 10:22   #73
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Alright smartarse!
I just find it frustrating when some people are so backwards in technology, like fourstrokes for instance...
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Old 06 November 2012, 10:34   #74
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Back to the original subject however: Would two d31m Optimas be the best bet?

Or one dedicated starting optima 34m and one deep cycle gel battery such as the Lucas 120Ah?
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Old 06 November 2012, 13:45   #75
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, like fourstrokes for instance...
Yeah, but at least they don't crack transoms or break down near Cherbourg
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Old 06 November 2012, 16:43   #76
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Yeah, but at least they don't crack transoms or break down near Cherbourg
I don't think the engine broke the transom it was the nobber with his hand on the throttle that did that.
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Old 06 November 2012, 18:41   #77
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Quote:
Originally Posted by gotchiguy
Back to the original subject however: Would two d31m Optimas be the best bet?

Or one dedicated starting optima 34m and one deep cycle gel battery such as the Lucas 120Ah?
Forget about deep cycle, gel, maintenance free, marine, etc etc, its all marketing bollix.

Cheap lead acid like what's been around since world war 1 will be fine for a few years then get a new pair. The rest is a lot more money for very little performance improvement.
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Old 09 April 2013, 11:40   #78
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Yeah, but at least they don't crack transoms or break down near Cherbourg
Just discovered the reason why it broke down in Cherbourg.

Anyone with a factory-rigged Osprey please check your oil pipes!!!

Quote:
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Forget about deep cycle, gel, maintenance free, marine, etc etc, its all marketing bollix.

Cheap lead acid like what's been around since world war 1 will be fine for a few years then get a new pair. The rest is a lot more money for very little performance improvement.
Apparently the Optimas can't cope with the 55amp output from the etec... they're ok for other brands but etec just puts out too much current.... so we have been advised to go with another brand (not too sure what yet). Although hang on...we're splitting the current to two batteries so perhaps it wouldn't be an issue at all..
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Old 09 April 2013, 11:55   #79
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Posted in error in wrong thread please ignore me.
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Old 09 April 2013, 12:00   #80
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I bought two of these and it works great as either a leisure battery, or starter battery (and it's cranking a big inboard diesel with no glow plugs).

http://www.tayna.co.uk/Leisure-Battery-Powerline-110-CaravanLeisureMarine-Battery-P7714.html

No connection with Tayna other than being a satisfied customer.
Hmm. Doesn't seem to give a CCA rating on the site

Swiss cheese all filled in...
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