A North American home gets its power as split-phase: two 120 V “legs” that are 180 degrees out of phase with each other, plus a shared neutral. Each leg measures 120 V to the neutral, which feeds ordinary outlets and lights. Across the two legs you get 240 V, which feeds the big loads: electric dryers, ranges, water heaters, central air conditioning, well pumps and EV chargers.
A power station that puts out split-phase 120/240 V behaves like a small version of that panel. That is what lets it feed a home transfer switch or generator inlet and power both 120 V and 240 V circuits.
Three kinds of 240 V
- Split-phase from one unit (9 stations here). Four-wire 120/240 V output, usually through an L14-30 or 14-50 outlet. This is what transfer switches and RV 50 A connections expect.
- 240 V without a neutral (2 stations here). A 6-20 or similar three-wire outlet that supplies 240 V only. It runs 240 V-only equipment but cannot feed a split-phase panel.
- 240 V with a second unit or hub (4 stations here). Two stations linked by the maker’s cable, hub or smart panel, together producing split-phase. Budget for both units plus the kit.
The 240V ranking lists the first two kinds, then the paired ones separately.
What can it actually run?
The 240 V output shares the station’s single wattage limit (see watts, surge and boost mode). A station’s continuous wattage divided by 240 gives the current it can supply at 240 V. Big motor loads like central air and well pumps also need a high surge rating to start. Check the appliance’s nameplate and the station’s manual before you plan around it.
Connecting to a house
Feeding home circuits needs a properly installed transfer switch or interlock with a generator inlet, so the station can never push power back onto the utility lines. Have a licensed electrician install it. Never connect a station to a house through a dryer outlet or a double-ended cord.
Sources
- Wikipedia, Split-phase electric power: two 120 V legs 180 degrees out of phase, 240 V between them, and which appliances use 240 V.
- Wikipedia, NEMA connector: NEMA 14 four-wire and NEMA 6 three-wire configurations.
- 240 V capability of each station: its manufacturer specifications, linked from its page.