Start battery capacity volvo penta 2003

[sailorman]

you were robbed @ Halfrauds

http://www.batterymegastore.co.uk/product/57412/
http://www.batterymegastore.co.uk/products/group/?c=Batteries+by+Application&a=Car&l=Exide+Batteries

 

[VicS]

The CCA rating will normally be based on testing, underwhich the battery voltage falls to about 7V (7V is used, as generally this is the lowest voltage that most 12V vehicle systems will continue to work down to). This means that a battery with a CCA of 190A will kick these 190A out at 7V (1330W). Your starter on your VP 2003 is around 1.4kW (lets say 1.7kW to allow for ~20% over tolerance), then you need a battery that will have a CCA of no less than 243A.

THat is of course assuming you'll need to start your engine when it's at -18°C, which unless the engine is fitted in an icebreaker, is unlikely! Performance at normal boaty temperatures is likely to be much better, but using the CCA as a benchmark in marine applications means you naturally overspec the battery by a reasonable amount.

This means that the RF750 or RF1000 would be more than adequate for this application. I'd personally go for the RF750 due to it having female terminals - much less hassle/chance of them breaking if overtorqued.

CCA is the current a battery can deliver for 30 seconds without the voltage falling below 1.2 volts per cell at 0F (-18C)

MCA would be more relevant for our purposes, being measured at 32F (0C), but one seldom, if ever, sees it quoted. In practice it is about 1.3 times the CCA.



The 1.4 kw figure given in the manual for the starter motor is in fact its mechanical output!

The electrical consumption will be considerably more. I suspect about 350 amps at 9 volts when cranking, but the initial current starting f a stationary engine will be much higher and possibly as much as 750 amps, with a terminal voltage of 7 volts, when stalled.

 

[Luxorlike2021]

Hi,

Does anybody know what battery capacity is needed to crank up a Volvo Penta 2003?

Thanks for help

Know this is an old thread (the VP 2003 is an old engine). I have tried to find an answer to this question because I wanted to install a 95 amp 850 CCA AGM battery instead of the old 70 amp battery VP recommends in the manual. This is because the bow thruster runs from the same battery - know that it is not best practice! I have now talked to an official Volvo Penta specialist, and he tells me that the limit is set to secure the charger to be able to fully charge the battery and not prevent damage.

So I am going to install my new battery running 95 AMP

Br
Rasmus

 

[pvb]

Know this is an old thread (the VP 2003 is an old engine). I have tried to find an answer to this question because I wanted to install a 95 amp 850 CCA AGM battery instead of the old 70 amp battery VP recommends in the manual. This is because the bow thruster runs from the same battery - know that it is not best practice! I have now talked to an official Volvo Penta specialist, and he tells me that the limit is set to secure the charger to be able to fully charge the battery and not prevent damage.

So I am going to install my new battery running 95 AMP

Welcome to the forums!

Your new battery will be fine and won't cause any problems.

 

[Tranona]

Know this is an old thread (the VP 2003 is an old engine). I have tried to find an answer to this question because I wanted to install a 95 amp 850 CCA AGM battery instead of the old 70 amp battery VP recommends in the manual. This is because the bow thruster runs from the same battery - know that it is not best practice! I have now talked to an official Volvo Penta specialist, and he tells me that the limit is set to secure the charger to be able to fully charge the battery and not prevent damage.

So I am going to install my new battery running 95 AMP

Br
Rasmus

Increasing capacity of the start battery to cope with a bow thruster is not really necessary as you don't need capacity but high CCA and the right size cables to minimise voltage drop to the BT. BTs demand short periods of high amps - not long slow discharge as domestic banks - and you will always be running the engine while using the thruster so essentially the alternator is powering the thruster. What is important is ensuring that the start battery gets priority charging so that all the alternator output goes to it first. A split charge system with a VSR is one way of achieving this. Provided the battery meets the CCA requirement of the bow thruster you won't see any difference in performance or life with a 90Ah battery rather than 70. In fact 70 is more than normal for an engine start only battery - 50-60 is adequate if the right type.

 

[Luxorlike2021]

Increasing capacity of the start battery to cope with a bow thruster is not really necessary as you don't need capacity but high CCA and the right size cables to minimise voltage drop to the BT. BTs demand short periods of high amps - not long slow discharge as domestic banks - and you will always be running the engine while using the thruster so essentially the alternator is powering the thruster. What is important is ensuring that the start battery gets priority charging so that all the alternator output goes to it first. A split charge system with a VSR is one way of achieving this. Provided the battery meets the CCA requirement of the bow thruster you won't see any difference in performance or life with a 90Ah battery rather than 70. In fact 70 is more than normal for an engine start only battery - 50-60 is adequate if the right type.

Thanks for taking the time to explain!