80 Series Alternator Output

This may sound silly but did you check the nameplate on the alternator?
Klaus

Garry,

I am sure that the 80 Series have a 100 amp alternator.

Depending on what type of fridge you have they would only draw 5 / 7 amps if both were running together. Driving lights would only be on at night and again depending where you are driving they would not be on all the time.

I would be inclined to run two heavy duty batteries with a good dual battery system that will handle charging two heavy duty batteries. Most dual battery isolating systems are set up to handle a heavy duty and a deep cycle battery.

I also think that the alternator can be rewound to give a bigger output.

Wayne

Just be careful as the alternators can and will try to match the load if it exceeds the rated output of the alternator, they don't last long before suffering meltdown.
Most likely to happen when winching.
While they can be rewound to provide higher outputs it is usually to the detriment of output at low revs.
I did it to cruiser diesel years ago and as long as the engine was spinning at 2 1/2 k rpm or more it was fine, but that doesn't happen all that often especially when 4 wheeling.

Hello Garry,
All of the above advice is great and accurate especially Wayne's on a good dual battery setup.

What I'm going to suggest to compliment a good dual battery setup is totally out of left field and in no way benefits me. I'm just a bloke with an electrical, electronic and industrial process control background that has finally seen something that actually achieves what it says it will in vehicle battery charging applications.

Your vehicle alternator is say 100amps and will charge the starting and auxilliary batteries to at best 70 to 75% converting a 100Ahr battery to at best 75Ahr. Nothing radical so far.

What if anyone could use their alternator to charge any number of batteries to 100% with a 4 stage algorithm and guaranteed to protect the alternator from overload?

Last weekend I was shown some of the most impressive Motor Home and 4wd battery charging equipment I've seen in years.

The item that interests us most in this application is a piece of equipment called a Sterling Advanced Alternator Regulator.

How does it work? It connects into your existing alternator overriding and supplementing the existing regulator.
What does it give us? As I said, an alternator with a four stage charging algorithm capable of charging batteries to 100% of their nameplate capacity. Most of us are familiar with three stage charging this unit does all that whilst the fourth stage is a desulphation stage. (Somewhat similar to the promises of say a Megapulse but different)

If your thinking of dual battery and want it to actually offer 100% of its expected capacity, have a look at Sterling Power

Any more questions please give me a holler.

Geoff.

If she is a petrol your standard factory fit is 80 amp ,, diesel is 130 amp ,,info from RACQ.

Yep. It says 80A in the manual.