Good bit of customer service from National Luna who have come back to me with the following good result......
"It is quite common to connect multiple batteries to form an auxiliary bank. It is good-practice to ensure that the batteries in a bank are the same age, size, capacity, type and exposed to similar temperatures.
The main battery being of a different type or age is not of concern since the main and auxiliary batteries will only be connected during charge and not discharge. This limits the chances of one battery being parasitic to the others.
It is far more common for main and auxiliary batteries to be different. A high-cycle battery is used as a starting battery and the auxiliary is very often a deep-cycle type."
Time to get wiring then......
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