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Battery Switch

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Pat Butler View Drop Down
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Joined: 07 August 2023
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    Posted: 19 November 2023 at 00:45
Dear Brains Trust,

I can't work out whether the starter battery is #1 or 2, or neither. On my old boat the starter battery was #1 and the house batteries were #2. I'm starting to think, as there are a pair of larger batteries and one smaller one that the larger batteries are #1 & 2 (and are house batteries) and the starter battery is the smaller battery and it is automatically/permanently connected to the starter motor. 

Would that be correct?

TIA
Pat
Hanse 342 3 cabin, wheel helm, shallow draught
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350Bob View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 350Bob Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2023 at 15:55
Hi Pat, I would expect the two larger batteries to be wired together in parallel and to make up your house or service bank while the smaller battery would be the engine start battery. The best way to confirm this is to follow the wiring from the batteries and see how they are connected. As to which is #1 and which is #2, just turn off one of the switches and see what stops working.

Bob
H350 #205
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Pat Butler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pat Butler Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2023 at 20:12
Thanks Bob, I can confirm the smaller battery is the starter battery, but still am not sure how you ‘switch’ this battery if u can at all. I guess you switch it on and off at the ignition, but on my previous boat I was able to start the boat using the house batteries if necessary 
Hanse 342 3 cabin, wheel helm, shallow draught
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 21 November 2023 at 11:32

We asked exactly the same questions as you when we got the boat.  Our yacht has this selector switch. 

https://seamarknunn.com/acatalog/battery-master-switch-6560.html?gclid=CjwKCAiAgeeqBhBAEiwAoDDhn4mPXG5n85Kptpw5YX5qW4YIhVzObQQ0JkNEXKbXAltW9PWSQOKTvhoCeokQAvD_BwE

 This determines which batteries are connected to the yacht’s electrics. 

So battery 1 is for the starter battery, the small one.
Battery 2 are the domestic batteries presumably wired in parallel.
1 & 2  or “Both” means that both sets of batteries are connected together.

This is the underside of the switch.


Bat 2 is the top one
Bat 1 is the right hand one
Where the 2 wires connect is the Feeder.  One wire (goes to)/(comes from) the starter then the alternator.
The other wire goes to the distribution panel.  On our yacht, it goes via a big fuse that you can see under the starboard back bed, just in front of the battery box.  (Another Hanse hidden speciality)

I think if you use a multi-meter on the resistance setting, between this fuse and the positive terminals on the batteries, you will find which switch setting connects which battery to the fuse.

If I remember it rightly?, we used to use it as 

Switch to 1 for starting
Switch to both when the engine is running, so both sets are charged.
Switch to 2 when the engine is not on so you are only using the domestic  set.
In emergency switch to both to start the engine.
Never switch to 0 if the engine is running, so always go from 1 to 2 via both

I now have a Sterling Alternator to Battery charger so that handles the charging of the 2 sets of batteries.  So now we just switch to 1 for starting and then switch to 2 for the rest of the time.

Some later boats have relays on them, but I do not know whether that had started on the 342.

Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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