3rd battery

A battery will only draw the current it's been supplied with. the 110 Ah is it's discharge rate. One volt placed across a one ohm resistance will cause a current of one Amp to flow. One amp for one hour is called an "amp-hour" or AH. so 110ah will supply 1amp for 110hrs or 110amps for 1hr etc etc. the alternator will top up all the batteries as required.

redhand said:

A battery will only draw the current it's been supplied with. the 110 Ah is it's discharge rate. One volt placed across a one ohm resistance will cause a current of one Amp to flow. One amp for one hour is called an "amp-hour" or AH. so 110ah will supply 1amp for 110hrs or 110amps for 1hr etc etc. the alternator will top up all the batteries as required.

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so in your opinion there is no problem connecting the two leisure batteries together whilst charging

No - they can be different amp hours without a problem, batteries have an 'internal resistance'. As they get changer the voltage rises. If one is flatter than the other the flat one will have a lower voltage compaired to the output of the charging system and hence more current will flow to the flatter battery.

Connecting two batteries together just creates one bigger battery, with a combined amp hour.

What sort of split charger to you have ? an electronic one or a diode one.

Either way if you connect a battery before the split charger this will pull the voltage down /up going to the split charger. Causing it not to function as well as it would, as the alternators regulator will get confused as well

Best option is to have the two leiser batteries in one bank for aux circuits, and the starter motor batter on the other bank doing the starter motor and main circuits etc.

I wouldnt. If either battery is different from the other, it can cause probs - best to run one, while charging the other.

anyone mentioned fitting a second alternator yet ?

Sean said:

anyone mentioned fitting a second alternator yet ?

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to run the third battery and nothing else, how difficult?

bevhelee said:

to run the third battery and nothing else, how difficult?

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what engine ?

200tdi, i have no scrap yards near here although i do have the original 45 amp alternater, presume just make up some brackets to fix it, longer fan belt? which leads off the back of alternater? its an A127

as for wether its electronic or a diode i dont know. its a Tmax system

bevhelee said:

200tdi, i have no scrap yards near here although i do have the original 45 amp alternater, presume just make up some brackets to fix it, longer fan belt? which leads off the back of alternater? its an A127

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that's about the sum of it - it's easy on the 200 as you can use the AC pump mountings (unless you already have AC)

I'd question the need for a third battery, but that's your call

having just a single current source for charging kinda negates the benifit having additional batteries (in my mind) hence if it was me I'd fit a second alt

some reading matter for you

Dual Alternators - LR4x4 - The Land Rover Forum

Split Charging - LR4x4 - The Land Rover Forum

Split Charging - LR4x4 - The Land Rover Forum

Fitted a second Alternator - LR4x4 - The Land Rover Forum

ME09

hope this helps

If you connect 2 batteries in parallel and they are identical in condition and type then no problem. If one battery develops a fault it will then drag the one it is connected to down.
If you want 3 batteries, I would either get a 3 way blocking diode fed from the alternator with one outlet to each battery. Or use a 2 way blocking diode, feed the main starting battery direct from the alternator and have a parallel feed from the alternator feeding the diode with the 2 diode outlets feeding the 2 auxillary batteries.
Personally I would use the former system as it means you get the full charge into the starting battery without the small voltage drop you get through blocking diodes.

have to agree sean sounds a bit too complicated, thanks for the reading matter will study it. Lee

where is the A/C mounted on the 200tdi?

bevhelee said:

where is the A/C mounted on the 200tdi?

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the pumps goes on top of the timing case - left - kinda above the IP

all cases will have the mountings cast, most have the holes drilled and tapped (about M8) - some will just have the holes drilled not tapped

i guessing i will need another pulley to cut up and weld onto the original for the fan belt?
what are the electrical connections?

you can get the air con crank pulley (you may already have it fitted) which has the extra pulley on it.

bevhelee said:

i guessing i will need another pulley to cut up and weld onto the original for the fan belt?
what are the electrical connections?

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you haven't read any of those links i posted have ya

looked at the first one but quite right, consider myself told, will go and do it now, sorry sean

redhand said:

you can get the air con crank pulley (you may already have it fitted) which has the extra pulley on it.

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just looked and have a single pulley