solar confusion

hi there guys and gals i am new to this site so please be kind.i have read more forums on solar setups than i can poke a stick at and still am filled with doubts and worries. So i thought id just ask you the experts my self so here it goes.i am wanting to run a 12v compressor fridge 100l Primus Mammoth on a solar setup, now the website says they draw 0.98 a/h which from what i have read is far from correct (maybe in the north pole) and the real figure i am looking at is around 3 a/h.I want to purchase a set of 240 watt panels and a 280 a/h deep cycle battery to power the fridge accompanied by a Ctek smart charger.
how long realistically could i expect to run the fridge for ? is this a sufficient setup ?
i have read sum equations on how to work it out but have failed miserably from what i have read it goes like this please correct me im far from a math wiz.

fridge uses 3a/h x 24 hours in a day =72 amps per day
solar charge gives me 12a/h x 8 hours of light =96 amps each day
battery discharge is 72a/h-96a/h=-24a/h
which in theory my battery wont be discharged and should have an extra 24a/h

are my maths correct? wont surprise if im wrong please help me and share your thoughts cheers until then Happy & Safe Travels :)

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