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Old 05 January 2005, 03:45   #1
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Second battery and switch

Hi all

Hope you all had a nice xmas

I m intenting to fit a second battery as part of getting the boat coded, i have read some information on this before but cannot find it, so

1) Where can i get some proper bracket to fit the second battery
2) Where can i get a DC power switch that can be, off, battery one connected, battery two connected and both batteries connected.

I realise i have not supplied the rating of the battery, but i just need some starting points please
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Old 05 January 2005, 04:27   #2
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Jimbob

Most chandlers will sell a battery box with lashing straps and a twin battery isolator.
The best isolators are the rotary bulkhead type, which give you the choice of 1, 2, 1+2 and OFF. Make sure that you switch to 1+2 when the engine is running so you charge both.
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Old 05 January 2005, 05:16   #3
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Jimbob, I asked a similar question over on the dark side a while ago after being concerned about putting heavy batterys in a plastic box in a boat that would be going to sea in all weathers. For once John Fuller came up with a useful suggestion and a photo which in the best traditions of ribbing I promptly splashed by having a local engineering company make a copy.

Portchester Engineering made this one me, cost £50. All I did was take them the photo and the new battery and left them to it.

http://www.applegate.co.uk/company/coz/1076067.htm

Pete
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Old 05 January 2005, 20:42   #4
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Why not get Rogue Wave to do it and sit back with a beer or two and watch

See 2nd post here :- Tsunami
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Old 05 January 2005, 21:34   #5
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http://www.aquafax.co.uk/pdfs/08a_cat.pdf

Is the link to the people what I get most of my components from. If I am doing it for myself or a discerning customer the I use the Blue sea stuff which is wicked.

I use normal commercial stuff for most work I do for people which is perfectly serviceable but not as sexy! I'll happily do the work for you and/or supply the normal components for the fund

regarding sitting back and watching I am not sure that watching my Banjo is that pleasent a view nowadays!
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Old 05 January 2005, 23:58   #6
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I attended a wiring class at West Marine as I was looking at the same 2 battery setup.
They suggested an isolator or better still a voltage combiner to get the best out of the system .(posted diagram below)
As the combiners are not cheap do you think it's a good setup or are they trying to sell equipment I don't really need?

Also they warned of not turning off the battery switch while the engine is running as this can blow the engine diodes.Not that I would think anyone would do,but are they correct.

(The 3 phase/stage charger shown is for permanant fixture in larger boats)

Any advice appreciated as i just carry a jump start pack at the moment in case the primary battery fails,
cheers Dal
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Old 06 January 2005, 08:32   #7
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Rotary switches

Quote:
Originally Posted by Mark Halliday
Jimbob

Most chandlers will sell a battery box with lashing straps and a twin battery isolator.
The best isolators are the rotary bulkhead type, which give you the choice of 1, 2, 1+2 and OFF. Make sure that you switch to 1+2 when the engine is running so you charge both.
The rotary is the cheapest and simplest way of connecting up a second battery.

However, chances are that the one time you flatten the battery the switch was set to 1+2 - to charge them both and hence both will be flat.

Better to fit a charging diode between the two batteries and then a second isolation switch for the second battery. That way the second battery will always get charged. When you need it isolate battery 1 and switch in battery 2.
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Old 06 January 2005, 09:20   #8
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Yup, I'd go with that.
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Old 06 January 2005, 09:35   #9
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Although I like the look of pete7 battery holder I think I would be inclined to make it out of something that doesn’t conduct

Equally what about sulphuric acid and aluminium seem to remember that that does interesting things
Des
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Old 06 January 2005, 17:41   #10
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Quote:
Originally Posted by Scary Des
Although I like the look of pete7 battery holder I think I would be inclined to make it out of something that doesn’t conduct
OK.. there's all of two inches between the battery terminal and the frame. I've heard of arcing but we aint talking thousands of volts here.

In fact. I think we are talking about 12.

RW.
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