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11 August 2021, 12:36
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#1
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Member
Country: UK - England
Town: Bath
Make: Cobra
Length: 7m +
Engine: Yamaha 225
Join Date: Jul 2021
Posts: 14
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Battery Options
I've got a Cobra with a pair of elderly batteries in dire need of replacing, one for starting, one for house.
Am I correct in reading that the 'Leisure' type batteries are the way to go for both?
Thanks in advance.
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11 August 2021, 12:40
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#2
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Member
Country: UK - England
Town: N. Devon
Boat name: (Not Another) Nutkin
Make: Highfield
Length: 6m +
Engine: Outboard, Honda 135
MMSI: 232036183
Join Date: Dec 2008
Posts: 2,047
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That's my understanding, and always found a caravan / agricultural supplier cheaper then any marine supplier.
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11 August 2021, 12:43
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#3
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Member
Country: UK - England
Town: Nottinghamshire
Make: Ranieri 15
Length: 4m +
Engine: Suzuki DF50
Join Date: Jul 2016
Posts: 1,281
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Quote:
Originally Posted by DS1570
I've got a Cobra with a pair of elderly batteries in dire need of replacing, one for starting, one for house.
Am I correct in reading that the 'Leisure' type batteries are the way to go for both?
Thanks in advance.
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I'd have one of each and not AGM as they don't handle abuse as well as regular SLA type. More important to get quality ones with low internal resistance spec as this only rises with age.
http://batteryfaq.org/
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11 August 2021, 12:53
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#4
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,180
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Quote:
Originally Posted by DS1570
I've got a Cobra with a pair of elderly batteries in dire need of replacing, one for starting, one for house.
Am I correct in reading that the 'Leisure' type batteries are the way to go for both?
Thanks in advance.
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Depends on several factors, what engine/s you have, what your “house” load is, how deep your pockets are.
I wouldn’t put a leisure battery on as starter battery for a large engine, leisure batteries aren’t designed to deliver high loads for short periods. Conversely, starter batteries aren’t designed to deep discharge. I have a starter battery & a “house” battery with a 1+2 isolator switch.
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Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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11 August 2021, 13:18
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#5
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Member
Country: UK - England
Town: Bath
Make: Cobra
Length: 7m +
Engine: Yamaha 225
Join Date: Jul 2021
Posts: 14
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Thanks for the input.
It's a 225 Yamaha. The House stuff is not high demand and no fancy amplifiers or anything like that. Existing House battery is 45ah.
The main battery is a 70ah with a CCA of 830.
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11 August 2021, 13:39
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#6
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Member
Country: UK - Wales
Town: Pembroke
Boat name: Rapscallion
Make: Humber Destroyer 6.0
Length: 5m +
Engine: E-TEC 150
Join Date: Jul 2006
Posts: 360
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To add to what Pikey Dave said.
Marine Leisure batteries are as Dave said a kind of compromise battery that needs to cover both House and Starting duties.
If you have an engine/house setup then much better to install a specific engine starting battery on the engine position as it'll have much better cold cranking capacity.
Leisure type is ideal as a house battery.
Having a battery switch that allows you to select 1,2,both (and "off" obviously)is definitely a good idea to prevent you flattening the engine battery when your engine is not running, or boosting it from your house battery when you do.
Rolls Royce solution is fully dedicated house and engine circuits with an emergency "jumper" isolator, but now we're getting complicated!
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11 August 2021, 14:18
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#7
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,180
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Quote:
Originally Posted by Jon Tallis
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Rolls Royce solution is fully dedicated house and engine circuits with an emergency "jumper" isolator, but now we're getting complicated!
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Pretty much a standard setup tbh. I have 2 Optima batteries, one is a dedicated starter battery, the other is the house battery. There’s a Blue Sea VSR between them & a 1+2 battery switch. The engine is connected to the starter (obviously) & the house is on the VSR. As soon as the starter battery is charged, the VSR closes & charges the house battery. In an emergency I can combine the 2 batteries with the 1+2 isolator.
Paradoxically, the starter battery is a smaller capacity than the house battery, but has higher CCA.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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11 August 2021, 14:37
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#8
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Member
Country: UK - England
Town: Bath
Make: Cobra
Length: 7m +
Engine: Yamaha 225
Join Date: Jul 2021
Posts: 14
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Ok thanks, I've got a plan forming.
System has a VSR, individual isolators and an emergency parallel option so it's well set up.
I think what I need (1 Starter, 1 Leisure) from brands I recognise will come in at sub £200 total so could be worse.
Appreciate all the help.
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11 August 2021, 18:10
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#10
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Member
Country: UK - England
Town: Plymouth
Boat name: HAPPY NOW
Make: Cobra
Length: 8m +
Engine: Mercury 350
Join Date: May 2014
Posts: 205
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I have always used Varta dual purpose and I am starting a 5.3 litre V8 on my splash dish. Always the best price is from Tayna batteries or Plymouth Battery Centre
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11 August 2021, 18:39
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#11
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Member
Country: UK - Scotland
Town: Easdale
Boat name: Miss Isle
Make: Solent 6.9
Length: 6m +
Engine: 225 optimax
Join Date: Jan 2008
Posts: 1,427
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Plus 1 for blue sea. Great solution and not a daft price
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I was born not knowing and have had only a little time to change that here and there.
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11 August 2021, 19:49
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#12
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,533
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I used duel cycle batteries for my rib
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12 August 2021, 09:35
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#13
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Member
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: S/R5.4/regal3760
Length: 10m +
Engine: Suzukidf70 2x6lp 315
Join Date: Jul 2009
Posts: 4,030
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Personally I've never seen much benefit from expensive batteries my rib I just fit a standard lead acid start battery of a decent size & they last prety well. My cruiser has 4 batteries in 3 banks two leisure batteries for the house system & 1 automotive start battery for each diesel engine & a jump start solenoid in case one engine battery goes flat. 9 years on the start batteries are original but the house batteries were replaced 5 years ago. My previous cruiser had 3 automotive start batteries, two wired to one engine & the house system & the other to the 2nd engine. 5 years in our ownership & never any issues.
If I was in the ops shoes I'd probably fit a standard automotive start battery & a leisure battery for the accessories or if hes not a heavy user of the accessories then maybe just go for a couple of start batteries & not run them too low with the accessories. In my experience unless your running your batteries to the extreme then cheapie ones last fine & dont break your heart when you kill one with neglect.
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12 August 2021, 14:47
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#14
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Member
Country: UK - England
Town: Bath
Make: Cobra
Length: 7m +
Engine: Yamaha 225
Join Date: Jul 2021
Posts: 14
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Ok, I've ordered a new pair of Numax units from Tayna. A starter battery and a smaller leisure one, both are slightly higher output/capacity than the ones being replaced. £191 delivered.
Appreciate all the input.
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