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Advice required re my batt set up please.

My boat has three 110ah leisure batts and 1 starter batt,   all four batts appear to be connected in parallel.

Is this correct, or should they be in separate banks?

The Isuzu33 engine is fitted with two 70A alternators.

Thankyou 

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1 hour ago, Malcolm48 said:

Advice required re my batt set up please.

My boat has three 110ah leisure batts and 1 starter batt,   all four batts appear to be connected in parallel.

Is this correct, or should they be in separate banks?

The Isuzu33 engine is fitted with two 70A alternators.

Thankyou 

 

It is certainly unusual to have two alternator feeding a common batter bank. Usually one alternator charges the domestic battery and one charges the starter battery. Presumably the alternators are paralleled? 

 

By having a common battery bank, you risk not being able to start the engine to recharge the batteries, should you flatten the batteries, perhaps by leaving lights on overnight.

Edited by cuthound
Spillung

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Three is an unusual number of domestic batteries too. Four in parallel is more common. 

 

This leads me to wonder if there is a fifth (starter) battery tucked away where you haven’t noticed it.  

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or you have not noticed it is only the negatives that are totally paralleled with the positives having a missing interlink between battery and the start battery. Canb be very hard to see in some installations.

  • Greenie 1

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Good point Mike, unfortunately it will be another week before I can check on that one. Although I can tell you the fourth batt is smaller than the other three.

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20 minutes ago, Malcolm48 said:

Good point Mike, unfortunately it will be another week before I can check on that one. Although I can tell you the fourth batt is smaller than the other three.

 

Ah, now that suggests closer inspection will reveal the scenario Tony describes, where only the negatives are all four joined up. I think three positives will be joined up and the forth, smaller battery positive will go off to somewhere else. 

 

 

Edited by Mike the Boilerman
Speeling.

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1 hour ago, Mike the Boilerman said:

 

Ah, now that suggests closer inspection will reveal the scenario Tony describes, where only the negatives are all four joined up. I think three positives will be joined up and the forth, smaller battery positive will go off to somewhere else. 

 

 

agreed

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8 hours ago, WotEver said:

But we’ll probably never know...

Maybe the op has lost his password.......

.......... or he did miss that wire.

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what an uncharitable bunch you are!  he's probably hiding under an umbrella somewhere waiting for a break in the weather so he can visit the boat.

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If what I suggested turned out to be true I suspect he will be feeling a bit if a lemon, not realising we all do similar things at times and its how we learn. For many people that is enough for them to keep their head down. Pity really because it is always informative to learn the outcome of questions.

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2 hours ago, Mike the Boilerman said:

 

The OP tells us in Post 5 it is gonna be a week before he can check.

 

Twelve days ago 🙀

 

And he’s not returned since. 

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4 hours ago, Mike the Boilerman said:

 

The OP tells us in Post 5 it is gonna be a week before he can check.

 

Twelve days ago 🙀

 

 

What's that in metric?

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5 minutes ago, Mike the Boilerman said:

 

Never heard of a place called Metric....

 

 

 

 

It comes before the Metro.

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