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Posted: Mon Oct 04, 2010 5:18pm

Post Subject: batteries

Hi, have just purchased a 35ft narrowboat, the engine is Vetus 3.10 the alternator is 35amp output There are 3 leisure batts fitted 1@95 amp & 2@85 amp.there is also a 2000 watt invertor fitted.but i have no dedicated starter battery, what would be my best option fit another battery or use an existing one.Thank you Terry Barlow


Posted: Mon Oct 04, 2010 8:49pm

Post Subject: batteries

That is very strange. A 2kW inverter and no starting battery paired with just a 35 amp alternator looks very much to me like either inviting endless problems or penny pinching. Personally I suspect there may be a dedicated engine start battery but you have not identified it as such Are you absolutely sure ALL the battery positives are connected together? The negatives should be but only two batteries should have their positives connected. I think you need to go onto my website ( work through the Battery and charging calculations which is in the articles section. That should give you a fair idea which is the best way to go. If you have a gas fridge and disconnect the inverter then with just 35 amps charging current I think you should use one of the existing batteries as an engine battery and work hard at minimising the domestic consumption. You could fit another battery if you have space but I am concerned about you ever getting them fully charged. Tony Brooks

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