Bow thruster battery

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Boat junkie

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Hi I've got a Sidepower se80 in a Sealine 360, it was powered from the main battery bank with some big cables but it's never been much cop, so I've had some more leads ,short but still very thick made up and intend to fit a sealed battery in a box in the locker under the bed , the instructions state it needs to be a min din550 or sae 1045 cca now all the battery's I've looked at quote the cca in EN ,not din or sae , I've phoned manbat there one biggest manufacture of battery's around and they seem to think if I need that many cca amps the battery I need will be 580mm long and cost £500 that's one hell of a battery that can't be right can it ? Not sure if I've got this all wrong or have any of you lot known there was that many ways of quote cca for battery's any help as to what battery to buy or what battery's you lot use would be of great help
Thanks
 
I think you need to look for the DIN:CCA and not SAE:CCA

SE 80/185T 12V : 550 CCA DIN/1045 CCA SAE.

My guess is you're quoting the SAE CCA and the dealers are looking up as a DIN CCA.

As an example https://www.tayna.co.uk/005L-Enduroline-Car-Battery-550CCA-P8399.html

EDIT: just to add a bit more detail from sidepower

"** All battery CCA ratings are stated with the DIN rating, multiply by 1.9 to to get the SAE equivalent (at 0ºF, ABYC standard)"
 
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Forgot to say I did buy a battery but wasn't sure if it was up to the job so was going to send it back but judging from the replys I might be over thinking it ,the battery I've got but not tried yet is a
numax premium 096 it says
12v 70ah 640A (en) would this be ok? It's about the same size as the one on my diesel car
 
Boat junkie said:
Hi I've got a Sidepower se80 in a Sealine 360, it was powered from the main battery bank with some big cables but it's never been much cop, so I've had some more leads ,short but still very thick made up and intend to fit a sealed battery in a box in the locker under the bed , the instructions state it needs to be a min din550 or sae 1045 cca now all the battery's I've looked at quote the cca in EN ,not din or sae , I've phoned manbat there one biggest manufacture of battery's around and they seem to think if I need that many cca amps the battery I need will be 580mm long and cost £500 that's one hell of a battery that can't be right can it ? Not sure if I've got this all wrong or have any of you lot known there was that many ways of quote cca for battery's any help as to what battery to buy or what battery's you lot use would be of great help
Thanks
Click to expand...
If you mount the battery under your bed, you'd best seal it in a box, vented outside the boat. Not easy to do. Lead acid batteries give off some unpleasant gasses, and you will not want to breathe these as you sleep.
 
A sealed type battery for the bow thruster is acceptable under the BSS if it is in a battery box but in an unvented compartment.
 
MartynG said:
A sealed type battery for the bow thruster is acceptable under the BSS if it is in a battery box but in an unvented compartment.
Click to expand...

Understood, but is this a risk you would want to take? What about the next owner of the boat, who when replacing the battery does not know this?
 
My boat has a bow thruster that was probably factory fitted.
The bow thruster is under the bed but the battery in the next section under the floor but still under the forward cabin floor.

My pre purchase survey revealed a non sealed battery was fitted and it was was shot ,and probably making gas . The previous owners did not die but they attempted to pass this on to me when I bought he boat. My surveyor identified the incorrect and defective battery and I deducted the cost of a new battery from the price of the boat.
Changing the battery was the one of the first first jobs done before the boat went anywhere.

I sleep very well on the bed and not worried about gas from the battery.
 
Electrically, yes. But I'd rather leave batteries far from the cabins and accept a bit of sub-optimization!
 
MapisM said:
Electrically, yes. But I'd rather leave batteries far from the cabins and accept a bit of sub-optimization!
Click to expand...

Having had big cables running from the engine bay to now having the battery next to the thruster, it's not a 'bit' sub-optimisation but MASSIVE sub-optimisation. I'd say my thruster is almost twice as powerful with the battery next to it.
 
KevB said:
Having had big cables running from the engine bay to now having the battery next to the thruster, it's not a 'bit' sub-optimisation but MASSIVE sub-optimisation. I'd say my thruster is almost twice as powerful with the battery next to it.
Click to expand...
The SE 80/185T 12V has a nominal current draw of 530 amp
Lets say 16m cable (2 x 8m runs) with 70mm cable the volt drop would be around 2.5v
With an overall length of 20m you are getting on for 3v
 
I'm fitting a sealed battery ,I have 4 very thick cables running to the thruster but it's still not good enough that's why I'm fitting a battery up front , it currently runs off my domestic battery's x4 big leasure battery's that are in good condition "they run my fridge on low my lights even an inverter for the tv for 2 nights and it will still start the engines "even when I've been plugged in and the battery's are full the thrusters still not much cop , I've tested the voltage at the thruster with it running in the water and the voltage is lower than what the Manuel says is exeptable, others on here have had success with battery's close to the thruster hence why I'm giving it a go it's cost not much more than £100 ,for new ( thickest cable I can get) ,all the ends crimped on battey and a box , it would cost more than that to replace my 4 leasure battery's and it still might not work and there leasure battery's the one I've got is a starter battey more suited to a thruster
 
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