If it helps, I have started a similar thread here.
I have been involved in some van projects where we added 24 and 48 volt alternators.
The 48 volt work, but it can be a lot more complex than 24 volt versions due to products availability.
Since my auxiliary battery pack will be 24 volt, gathering together info on what it takes to add on an after market alternator on the 25+ cummins / 3500.
The reason is that it is fairly easy to get 3 kW from a 24 volt alternator and much easier to move it around.
Right now just gathering information.
Thanks
WARNING - This is just information gathering and some of it will not be correct...
There are two general approaches to adding a second alternator to a vehicle:
1) Keep them completely separate power systems
2) Have the engine controller operate both alternators together
Each approach has advantages and limitations.
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In the case of #1, the effect is:
- You can put in any voltage that you like, 12, 24 or 48 volt
- Much higher current / power combinations possible
- It is really good for charging up an auxiliary battery bank in the bed or in a trailer
- Can be set up for Li or AGM batteries directly
- Completely separate wiring plus body ground at the last minute
- Separate "alternator controller" from the vehicle engine controller
- Needs it's own battery bank vs using the starter engine battery
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In the case of #2, the effect is:
- One more thing that the engine controller is doing
- Factory programming and support needed
- Not sure about RAM, but often the second alternator field current is not activated unless alternator #1 is substantially at it's limit for output
The nice thing is that it uses the common starter battery setup
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