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Does Seawind offer a US style split phase 240V system on the 1370?

Published on 04/14/2026

Definitions:

For years the UK / AU system was known as 240v / 50 Hz however most countries have now transitioned over to 230v / 50 Hz. As much as possible therefore, we refer to our EU/AU/Rest or world power now as 230v rather than 240v, to avoid confusion around the US style, 240v / 60Hz splt phase system.

What we are currently offering on the 1370:

Inverter charger unit:

For a US spec, 120v boat we use the 24volt/4500W/120 Amp Charger unit per the below:

 

At 4500 Watts of continuous power, plus a surge of 6750W (30 secs) or 9000W (5 secs) this base unit has plenty of power available for users. 

The Mastervolt combi units are voltage specific, so this is a 120v 60 Hz unit only.

Shorepower:

Following feedback from our US customer base and dealers, we upgraded the shorepower on the 1370 to a 50 Amp shore connection at 120v, single phase. Taking on the feedback from our US market, we optioned the 1370 very early on to use the Smart Plug range of shorepower connections. These units have a larger surface area on the connections and pledge to be far safer than the older style shore power connections commonly used in the marine industry. The US split phase plug at 50 amps is commonly available at US marinas, so whilst we donlt run a split phase system, we do use the split phase 240v (US 240v) plug, utiliizing only use a single 120v line of it.

 

50 Amps at 120V is 6000 Watts of available power going from your marina pedestal through to your 120v outlets on the boat. Of course, if you were using the full 6000 watts, you will not have any power left to go to the combi battery charger unit, but that is some serious power being consumed.... Even if you do dip over the 6000 Watt shore power supplied from the marina pedestal, the inverter will top up the demand from the house bank, as it can boost the output when required.

Heating / Aircon:

One of the big improvements we introduced with the Seawind 1370 is the use of DC aircon. This obviously takes a huge load off the inverter, allowing spare capacity to run other AC electrical devices whilst also running the aircon in either heat or cool mode (all our aircon units are reverse cycle providing a heat function also). Yes, if you're dock based, you would still want to have your shore power connection setup, so that your combi unit charger is charging your house bank, from which the DC aircon is being powered from. 

Summary:

So Seawind does not currently offer a US split phase 240v electrical installaiton as standar, however we have designed a system that we feel negates the need to go this way due to the high spec inverter/charger unit, and the move to DC based reverse cycle aircon units. 

 

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