Electrical Site online

[TonyBrooks]

As prommised the Reading College Marine Maintenance site now has the
Electrical notes on it.

I hope you will find it usefull

www.reading-college.ac.uk/marine

Tony Brooks


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[Colinl]

Thanks very much for putting it up.

I will be doing my rewiring during the summer along with all the other jobs before relaunching next year.

Thanks again


Colin

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[paulrossall]

Excellent information. Thanks for compiling it. Paul

<hr width=100% size=1>" there is nothing-absolutely nothing-half so much worth doing as simply messing about in boats".

 

[Jools_of_Top_Cat]

Do you mind questions?

I read with interest your information regarding 12v compressor type fridges and what you have said makes some sense as to why mine needs really full batteries in which to operate, otherwise you hear it power up for a second then shut down.

So now I know the problem as such, the solution should be larger cables, here is the confusion, I am already using cables maybe 2x the x-section of those popping out the bottom of the compressor, does this mean I should be looking at putting heavier cable in place of the manufactures cables. The run back to my fuse panel is quite long - 14ft.

Or should I not use the fuse panel and go straight (fused of course) to the port battery which would be around 7ft. Running starter type cable seems a little over kill when the manufacture has used such light wire, I don't know what to do now.



<hr width=100% size=1>J

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[TonyBrooks]

My fridge, about 13m from the batteries is wired (on the manufacturer's calculations) in fexible starter cable - in fact I 've used some scrap lengths for the starter circuit.

Allow 1mm sq cross sectional conductor area for each metre bertween battery and fridge, us ethe same for the return (Shorelne).

I have run a totally independat circuit via its own fuse (10 amp as recomended I think) right from the battery isolator switch, and upgraded the battery to switch cable to match.

I have a double pole, 40 amp (mains) on/off switch with both poles wired in parrallel to turn the fridge on and off.

You must fight voltdrop every inch of the way, and do not expect to be able to measure the massive current surge on starting - its too quickly over.

Tony Brooks

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[Jools_of_Top_Cat]

Just thought I would revive this thread.

Today, I wired my fridge deiectly from the battery switch (through fuse and switch by fridge) to my fridge. Not starter cable but around 7mm.

Wahey, fridge works fine now without having to run engine, no more cutting out after it starts up for a few seconds.

Thank you for the advice, or at least pointing me in the right direction concerning the way these fridges work. I must have some losses around my panel and cables. Next winter job I think!

<hr width=100% size=1>Julian

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[Bejasus]

Hi Tony, there is a wealth of useful information on this site, but I have a suggestion. What is the possibility of providing the information as a down loadable .pdf file. It would be great to be able to keep this information to hand as opposed to have to keep referring back to the website.

Just a suggestion.

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