At 100 feet you are right at the cusp of voltage drop. The issue at 100 feet and greater is the conductor size to prevent voltage drop. At 30 amps the conductor size is #10, once we go greater than 100 feet we would increase that size to #8. If you have a voltage meter and feel confident to do a voltage check, I suggest doing so prior to spending $ on a voltage booster. If you do not feel confident in doing so ask a neighbor, or contact an electrician. You do not have to remove a panel cover, or open up outlets to do voltage checks. The tool cost is much lower than the cost of a booster.
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