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The amperage capacity of AL is much less than CU. If you are installing conduit I would use 1/c 1awg CU THHN. If you are direct buring it I would use 2/0 AL service entrance cable. Think about pulling cable and phone while your're there or at least an extra rope for down the road.
You will be required to have a disconect so as mentioned you are betteroff going with a 100amp sub-panel. 100amp service shoudl be fine.
Now the pther issue is feeding 100amp. Very dependent on your main service, hopefully it is 200amp.
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1985.5 944 GTS
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