Uuuummm do you mean 20 Watts. 200 Watts is about 18 Amps. The BD50 Compressors won't use that much... or are you talking a days useage. If so it is easier to talk in Amp/Hours
I would budget that you will be using about 3 A/H on the big 95 Frig during the day Ross and about 2 A/H over night. You should be under those figures but thats what I would use.
That means about 60 A/H to find each day to replenish batteries which you should do easily with about 4 hours on Genny and a small Charger of 6 to 8 Amps capacity if that is your plan. If you have the Frig on the genny while it is running and do longer than 4 hours (but who wants that at Cape Riche) you won't need much battery recharging at all.