I am the last slip on the dock at my marina. Because of this I have only 118 volts at the dock receptical and at the outlets inside the boat (new shore power cord). When I turn on my A/C the voltage drops to 108 volts at the dock plug and at the A/C outlet inside the boat. I'm using an inexpensive multi tester to test the voltage, sorry no amp meter.I am assuming this voltage drop can't be good for the compressor so I shut down the A/C. What can I or the marina do to boost the power?