Large inverter may not be required. If they're modern'ish fridge or freezer they may be the digital inverter type compressor (i.e. variable speed) and the start up current is minimal. Only small inverter required. Less losses using a small inverter.
We have been running a 319 litre Samsung fridge freezer off grid at our high country bach for 6 years on a 300W inverter. Typical load is 50-70W. 3 x 250W PV and 12V 250Ah (@C10) lead carbon battery. No issues. Chose lead carbon battery as far more robust than sealed gel or AGM so can handle the ocassional snow dumps where they might get discharged lower
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