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Hi Laurie and first off, welcome to the forum.
While my kits are a standardised setup, I offer customising when required, and I have a number of customers who have requested to have their kit setup to either have the auxiliary battery fitted in the rear cargo area or, like yourself, want to add an additional removable auxiliary battery, usually in the form of a battery box, in the rear cargo area.
I charge around $50 for a 1m 6B&S extension to be added in the rear cargo area.
The extension comes with a 50 Anderson plug and a 50 amp In-Line auto resetting circuit breaker, but the ABG-25 remains connected to the main loom.
Keeping the ABG-25 connected to the main loom means that if you remove the rear mounted auxiliary battery, any other batteries being used to power accessories you are running in the rear cargo area, are still protected against being over discharged.
Next, DC/DC devices are very inefficient at what they do. When running off your alternator, this inefficiency is made up for by the alternator producing additional energy to compensate for the inefficiency but is nothing more than a waste of fuel.
When a DC/DC device is running off solar, this inefficiency is a lose of energy that can not be compensated for, so you loose some of your limited solar panel energy, just to power the DC/DC device and some brands of DC/DC devices are very inefficient when being used as a solar regulator.
Dedicated solar regulators are usually far more efficient and this means less of your limited solar power is needed just to power the regulator itself.
There is also another major advantage with using a dedicated solar regulator. If you have a caravan with solar on the roof, then while towing, the solar can be charging your batteries at the same time as your alternator is, and this will both shorten the drive time needed to recharge all the batteries, and it will mean a slight decrease in fuel usage.
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