Habitation Battery overheating

[hilldweller]

That is somewhat thicker than the wires that carry the 40,000 volts on the over heads !!

Well he'd use smaller if he had 40,000V batteries.

In fact, the time he spends modding his MH it's only a matter of time.

 

[hilldweller]

Thanks to everyone for your informative and helpful replys I have ordered 2 new batts from battery megastore same spec as before

Our original German leisure battery lasted 8 years. Why has yours failed so soon is a serious question.

 

[Badknee]

That is somewhat thicker than the wires that carry the 40,000 volts on the over heads !!

It probably is, there's a lot gone missing lately

 

[Techno]

It is current that dictates cable size not voltage. The national grid uses high voltage to enable smaller cable to be used as it means very low current.

 

[Gizmouk]

That is somewhat thicker than the wires that carry the 40,000 volts on the over heads !!

Litle boys toys
Smallest we generally use on our DC systems is 240mm2. For larger systems or long cable runs- 300 to 400mm2 is the normal. We rarely use 630mm2 now as too difficult to work with... either that or we're getting to old

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[Jaws]

It is current that dictates cable size not voltage. The national grid uses high voltage to enable smaller cable to be used as it means very low current.

Yes but it aint 35mm thick though Andy !!
You are saying the cables you run are bigger than the battery terminal posts ??

 

[Techno]

70mm to inverter too

 

[tonyidle]

Yes but it aint 35mm thick though Andy !!
You are saying the cables you run are bigger than the battery terminal posts ??

Not really - 35 sq mm = 7mm (ish) diameter.

 

[Techno]

Yes cable is always referred to in CSA in the U.K at least

 

[Mr Ed]

Thank you Scotjimland now I know where to put vents for hab batteries. And A Happy New Year to you and hour's. Martin

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[Jaws]

Ok.. so I mention a cable thickness which folk not working in the game can understand yes ? ( as in 10mm thick.. )

No mention of sq mm
And when Andy replied STILL no mention of sq mm, just a stated 35mm which taken in the same context as I mentioned ( the reply 'I use 35mm' was immediately following my 10mm one )

Suddenly someone pops up and states the measurement is sq mm..
So tell me guys, what is the average user of this forum going to comprehend ? 10mm thick ... as in 10mm across the cable.. Or slightly clever ( though absolutely correct of course ) stuff given in sq mm ?

There is an amazing amount of extremely intelligent people on Fun.. But not all members would grasp the difference between thickness and sq mm thickness.. Same way as a lot of folk would not understand skin affect or indeed how the properties of cable changes with QRG due to Doppler effect

Good debate this .. good to exercise the brain cells a bit.. Takes me way back to when I did my first thesis on depletion layers back around 1969... But perhaps not the place as I suspect it might get fairly esoteric ! LOL !!

 

[irnbru]

Yes makes great reading and good to learn. Thanks guys.

 

[mjltigger]

Yes makes great reading and good to learn. Thanks guys.

I agree. It's good to learn from people who's knowledge is based in both theory and practical application.. and if we get confused we will ask (like I did)

 

[Techno]

Your hook up lead should comprise of 3xcores of 2.5mm2 cross sectional area. That is without any insulation so if we were talking diameter it would be 7.5mm (but being triangulated probably less than 5mm) before adding two layers of protection.
Cable thickness too is ambiguous as are we talking bare copper or the whole caboodle?
35mm2 CSA welding cable is about as thick as my little finger tip.
The insulation is thick to not only insulate but for mechanical protection.

Nearly all cable has it's size printed (or embossed) on the sheath somewhere with mm2

It gets more complicated with AWG American wire gauge
We have to use a conversion chart to relate it to mm2 unless you use it so often that you know each size.

Also domestic wiring is flat. A ring main is wired in 2.5mmCSA but only the L&N are 2.5, the earth in between is often only 1.5mm. It too will have the size embossed on the outer sheath but it will only be trade knowledge that the earth is smaller.

Most important though is that when sizes are quoted for current carrying capacity the size is CSA or AWG of the BARE conductor only never diameter nor including insulation.

 

[Wildman]

commonly known as a fat bastard wire

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[scotjimland]

@Techno100

not forgetting us old boys who still remember using imperial size cable..

which were described by the number of strands/diameter of each strand in inches.

So 7/.036 was a cable whose main conductors had 7 strands, each of which was 0.036” in diameter.

ie..

1/.044
3/.029
3/.036
7/.029
7/.036
7/.044
7/.052
7/.064

 

[Jean-luc]

A word about vent pipes.
A while after I installed my two new batteries I was in the garage and heard what sounded like the faintest hiss of escaping air .
I eventually tracked it town to the vent pipe of one of the batteries being pinched by the battery where it exited through the battery tray.
When I moved the battery slightly there was a definite release of pressure, not much fortunately

 

[Wildbill]

Last time i saw an exploded battery it was on a car.

The whole top cover had blown off causing some serious denting on the bonnet and one side had blown out.
acid everywhere.

This had happened as the driver turned the key to start the engine.....must have put a severe load on an already faulty battery.

I bet it put a severe load in his under pants to

 

[Techno]

not forgetting us old boys who still remember using imperial size cable..

Yes Jim they were just going out as I came in mid 70's
Same with conduit, I had to carry dies and adapters for everything

 

[scotjimland]

Yes Jim they were just going out as I came in mid 70's

started my electrical maintenance apprenticeship at India Tyres in 1965 ...

emmigrated to S Africa in '73 and they had already converted to metric cable and conduit .. way ahead of the UK

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[Techno]

Started mine at St James's hospital 1974 and it was a nightmare.
All the old wards were often capping&casing, decades of different installation types.

 

[mitzimad]

No one has mentioned the most dangerous aspect of all this ..

I have seen the sides of building being taken out

was you inside or out at the time?

 

[Jaws]

was you inside or out at the time?

I was called in AFTER the event to recover what was left of our rental fork truck !!
I took all bar the balance weight away in a transit !! Even the mast was bent and twisted