The most obvious difference is that the Integrel system does not require a separate engine. This means that the fitting costs are less than for a stand-alone generator with no need for through hull fittings and no separate fuel, exhaust or cooling systems. Lifetime maintenance costs are also substantially less as Integrel only needs a periodic belt change; there's no more second engine checks and maintenance schedules with Integrel! 

Other key differences are that the Integrel system improves the fuel efficiency of the propulsion engine by up to 25%, reducing overall vessel fuel consumption. It is fully automatic, managing electrical power generation, storage, conversion and distribution in one package. Integrel also allows you to reduce the size of your 12 and 24 volt house battery banks with its powerful battery to battery charging capability and reduces the size and weight of the cabling for power hungry consumers such as bow thrusters, windlasses and winches.