The prices are very high, I can only suggest you get some more quotes. There was a brand new Axpert 3KW inverter being sold here which is sold now but it should give you an indication of the ballpark price you should be looking at. I charge customers around R2200.00 each for the Trojan 6v deep cycle batteries I'm not sure why you're getting quoted R5K each unless they're a much higher specification battery.
I'm not familiar with the Maximus batteres but I think your original spec with the Axpert inverter and Trojan batteries was probably spot on, like I say I'd do some more investigating for better prices if I were you.
Voltronic are the Taiwanese company that produce the Axpert range of inverters mentioned above. I'm not really understanding your question here. Some of the Axpert inverters are scaleable whereby you can connect two of them together and they produce a single output that's double the power of a single inverter. Not all are capable of this so you need to read the specs of the different models.
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