TT-30 vs L14-30 vs 14-50: Power Station Outlets Explained

A TT-30 is a 120 V, 30 A RV outlet; an L14-30 is a 120/240 V, 30 A twist-lock used to feed a house through a transfer switch; a 14-50 is a 120/240 V, 50 A outlet used by larger generators and 50 A RVs. Only power stations with split-phase output can supply 240 V, and any connection to house wiring needs a licensed electrician. Of the current models we track, 10 have a TT-30, 3 have an L14-30 and 3 list a 14-50.

Why is a TT-30 not the same as an L14-30?

Both say “30”, and that's where the similarity ends. A TT-30 has three wires: one hot, a neutral and a ground, so it supplies 120 V only. An L14-30 has four: two hots, a neutral and a ground. Between either hot and the neutral you get 120 V; between the two hots you get 240 V. That's the same split-phase arrangement a US home uses, which is why the L14-30 is the standard plug for feeding a house inlet.

The practical rule: a station with only 5-15, 5-20 and TT-30 outlets is a 120 V station. However big its battery, it can't run a 240 V well pump, central air conditioner, electric dryer or range. Several large units sit in exactly that spot, with a TT-30 but no 240 V output: Anker SOLIX C2000 Gen 2, Bluetti Elite 300, Anker SOLIX F3000, EcoFlow DELTA 3 Ultra Plus, Jackery HomePower 3000, Jackery HomePower 3600 Plus, EcoFlow DELTA Pro.

What is a 14-50 outlet, and which stations have one?

A 14-50 is a 120/240 V, four-wire, 50 A receptacle with straight blades, not a twist-lock. On a power station it is the 240 V outlet on a few home-backup units: Bluetti Apex 300, Jackery HomePower 3600 Pro Max, Jackery Explorer 5000 Plus. The outlet's 50 A rating doesn't mean the station supplies 50 A; the station's inverter sets the limit. Jackery's manual for the HomePower 3600 Pro Max, for example, rates its 14-50 at 4,000 W, and notes it is a 14-50, not an L14-30.

What does a TT-30 on a power station connect to?

Mostly an RV. A 30 A travel trailer's shore cord plugs straight into it, and the whole 120 V side of the RV runs from the station: outlets, the converter that charges the house battery, and the air conditioner if the station can start it. The station's own limit applies first. The Anker SOLIX C2000 Gen 2, for instance, limits its TT-30 to 20 A, about 2,400 W at 120 V, and its inverter is rated 2,400 W. A 13,500 BTU rooftop AC is a hard start (surge watts explained); see whether a power station can run an RV air conditioner before counting on it.

One RV wrinkle: some surge protectors and energy management systems check for a neutral-ground bond and refuse to pass power without one. Anker says its stations use a floating ground and that devices needing a bond need a ground-neutral plug. If your RV's protector faults on a power station but not at a campground pedestal, that's the likely reason. More on sizing in the RV picks.

What does an L14-30 connect to?

A generator inlet box on the outside of the house, wired to either a manual transfer switch for selected circuits or a backfeed breaker with a mechanical interlock in the main panel. Either way, the transfer equipment keeps the station and the utility from ever being connected at the same time. The NEC requires that kind of transfer equipment for standby sources, and the 2020 edition requires it to be listed; check the edition your state has adopted.

This is work for a licensed electrician, with a permit and inspection in most places. The electrician also sets up the neutral-ground bonding to match your switch, which differs between floating-neutral and bonded-neutral sources. Brand systems such as Anker's Home Power Panel, Jackery's Smart Transfer Switch and EcoFlow's Smart Home Panel 2 skip the cord and switch automatically, and their makers require professional installation too. Every option, from cords to panels, is compared in how to connect a power station to your house.

Never connect a power station or generator to a wall outlet, dryer outlet or panel without a transfer switch or interlock installed by a licensed electrician. Power can flow back out through the meter and transformer onto lines that crews think are dead.

Are outlet adapters safe?

An adapter changes the plug shape, never the voltage or current behind it. Three rules keep that from going wrong:

• It can't add 240 V. A 50 A RV cord on a TT-30 adapter gets 120 V and no more than the TT-30 supplies, so the RV's 240 V appliances, if it has any, won't run.
• Rate it for the full current and buy it from the station or RV maker where you can. Anker, for one, sells an L14-30R-to-L14-50P adapter for specific home setups.
• Never use an adapter or cord to reach house wiring. The only safe path into a home circuit is an inlet and transfer equipment installed by an electrician.