Wiring size to breaker box

I have a Magnum MS4448PAE inverter at my cabin that is off grid and am getting ready to run wiring to the outside breaker box which is a little less than one hundred feet and I need to know what size wire to get for the run all my lighting is led and I have a small microwave and a 1/2 horsepower well pump so I'm wondering what gauge wiring I would use to not overload the wiring? Also we will be doubling the size of the cabin in the future so would like to put in wiring that would cover the future needs. We now have five 2 x 4 foot lights with two 4 foot led lights in each light fixture, two led table lamps, a small microwave and a 1/2 horsepower 110 volt well pump we will be doubling the lighting I'm sure. I hope that its enough information to figure out what size wiring will be needed thank you for your help, I'm not a electrician so I can't do the calculating.
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- Assorted other systems, pieces and to many panels in the closet to not do more projects.
- Assorted other systems, pieces and to many panels in the closet to not do more projects.
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