Inverters

Can I please have some thoughts on the following?
I have a ute fitted with:-
2 x 160 watt solar panels
2 x 120 Amp AGM batteries
Redarc BCDC1240 Charger/MPPT ccontroller

I am mostly running a 70 litre fridge freezer ( permanently on ) as our second fridge with our main gear in our van which has its own panel and batteries.

My question : I wish to buy an inverter and would like to know what are/if any the disadvantages of purchasing say a 1500/3000 watt pure sine inverter over say a 600/1200 watt inverter if only running say 500 to 600 watt items.
Apart from the obvious $ difference am I using more power to run a larger inverter when only powering a small appliance? Is there is a power difference is it worth worrying about.

I would like a bigger inverter for just in case scenarios and better to buy now rather later.

Thanks

Neil
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