Replacing an existing genny is a PIA. They are bulky and very heavy. It is mostly plug and play grunt work.
Installing a genny on a boat where there was none will be a PIA and expensive. Hire an expert marine electrician (if you can find one with a week to spare). Have all the grunt work done before he arrives. (Fuel, water, exhaust, etc).
Be prepared to pay about the cost of the genny for the installation. Probably more.
Match the fuel used to your main engine. (diesel and diesel, gas and gas)
DO NOT consider an air cooled genny on the swim platform with a cord running to your coffee maker. Your neighbors will hate you!
pete
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