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Ok IMHO as an electrical professional go as big as you can with in your budget. I have a 6kw that has served me well. The issue with buying one that will serve the loads you require at its peak is heat. If your fridge draws 15a at 120 V that is roughly (simple calculations) 1.8 kw. At 120v a 2kw engine will big down every time the sump turns on and will also be running full out to maintain your refrigerator. Go with a 4 KW then you at least have the option of adding things to your load as needed. Just make sure if you hitch it to your panel you kill your main! I recommend putting in a transfer switch (because it is illegal to not by code and I am bound by law to do things that way)
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