Yes: If you have 120V available use that (then you won't burn up your propane--it isn't much though).
I've used both: We don't have access to 120V in the storage lot where we keep our RV. Thus I'll stop by in the morning before I pick it up to turn on the propane (and make sure the batteries are good to last all day).
In the winter I didn't have enough battery available and asked if I could move it for a day and plug it in (they let me).
Use/Store switch has to be on Use--Refer won't run on Store.
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