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[Kevin Wood]

Initial inspection of the wire guage suggests so Kevin.  But I wonder how much it would handle if I was powering a towed caravan  (heaven forbid)  as well as charging get the leisure battery 

Pikey!

[Kevin Wood]

The thing is, as soon as the wire starts to get heavily loaded, the voltage at the "boot" end will drop, so any charge being absorbed by the leisure battery will drop off quickly. It might end up being self-regulating, although the run of cable needs to be appropriately fused, of course, so that would ultimately stop it ending too badly.

I ran a 40A rated thinwall cable into the boot for my amplifier. It now also runs a ham radio rig. It was easy enough to route the cable, so you might as well go that route, IMHO. The thicker the cable, the less voltage drop and the more effectively the leisure battery will charge.

[05omegav6]

That relay is fused

[Gaffers]

Initial inspection of the wire guage suggests so Kevin.  But I wonder how much it would handle if I was powering a towed caravan  (heaven forbid)  as well as charging get the leisure battery 

Pikey!

Thats scared you didn't it?!

I wouldn't be converting the rear space of the miggy if I was going to get a Pikey van.  I don't want a tent because I am normally too tired after a fishing session to do much else.  It's amazing how much a zen sport like this takes its physical toll.

[Kevin Wood]

I don't want a tent because I am normally too tired after a fishing session to do much else.  It's amazing how much a zen sport like this takes its physical toll.

Excuses, excuses.. You'll be taking a dump in your wardrobe before you know what's happened. 

[05omegav6]

Is there anything to say that a second, identical charging relay and loom couldn't be fitted, thereby retaining the tow bar supply and the boot supply

[Kevin Wood]

Is there anything to say that a second, identical charging relay and loom couldn't be fitted, thereby retaining the tow bar supply and the boot supply

No.

[05omegav6]

Is there anything to say that a second, identical charging relay and loom couldn't be fitted, thereby retaining the tow bar supply and the boot supply

No.

There's your solution then Matt

I think I have another loom buried in the garage...

[Gaffers]

I don't want a tent because I am normally too tired after a fishing session to do much else.  It's amazing how much a zen sport like this takes its physical toll.

Excuses, excuses.. You'll be taking a dump in your wardrobe before you know what's happened. 

I actually have a portapotty for that 

[Gaffers]

Is there anything to say that a second, identical charging relay and loom couldn't be fitted, thereby retaining the tow bar supply and the boot supply

No.

There's your solution then Matt

I think I have another loom buried in the garage...

 

[steve6367]

While I don't disagree that the thicker the cable the better in principle,  the GM installed feed does would and is adequate in my experience.

As its so quick you may like to connect it up and measure the voltage drop before you go to all the hassle of running another cable.

Steve

[Auto Addict]

The thing is, as soon as the wire starts to get heavily loaded, the voltage at the "boot" end will drop, so any charge being absorbed by the leisure battery will drop off quickly. It might end up being self-regulating, although the run of cable needs to be appropriately fused, of course, so that would ultimately stop it ending too badly.

I ran a 40A rated thinwall cable into the boot for my amplifier. It now also runs a ham radio rig. It was easy enough to route the cable, so you might as well go that route, IMHO. The thicker the cable, the less voltage drop and the more effectively the leisure battery will charge.

I was always under the impression, the more strands of copper wire in the cable, the more efficient it became.

[Kevin Wood]

I was always under the impression, the more strands of copper wire in the cable, the more efficient it became.

It's the total cross sectional area of copper that's important (for DC, at least). Making that area up out of multiple strands instead of one solid strand (as is used in house wiring, for example) just makes the wire more flexible.

[omega2018]

you could always upgrade the main battery to a diesel spec 85a/h  so that's near 30% more than the standard 66a/h assuming you are not diesel already. they just about fit in.   then if you also carry one of the new generation small lithium jump starters in the boot you needn't worry about not being able to start in the morning. 

not as good a solution as a separate leisure battery and charging circuit, agreed,  but much easier.