[Gav]

The other thing to keep in mind is that there are different inverters available too.
Solar cells are prone to overheat and then need to be 'throttled back' to allow them to cool.
A cheap inverter will just turn the system off to allow them to cool where as the dearer ones will back off while still providing a portion of the output.
It may not sound like a big deal, but during the hotter months it will make a huge difference to your ability to produce power.