Home backup
Bluetti Apex 300: AT1, interlock or manual transfer switch
Anything that connects to your breaker panel is a job for a licensed electrician, with a permit and inspection. That covers inlet boxes, interlock kits, transfer switches and the makers' smart panels.
Never power house wiring by plugging a battery or generator into a wall, dryer or range outlet with a double-ended ("suicide") cord. That is called backfeeding: it is illegal, it can electrocute utility lineworkers and neighbors on the same transformer, and it bypasses your home's circuit protection (CPSC, OSHA).
AT1 vs interlock vs manual transfer switch
| Bluetti AT1 | Inlet box + interlock | Manual transfer switch | |
|---|---|---|---|
| Switching | Automatic (Bluetti) | By hand: main breaker off, interlock over, backup breaker on | By hand, one switch per circuit |
| What it ties in | Grid, generator, rooftop solar inverter and Bluetti batteries; up to three Apex 300s through Bluetti's Hub A1 | Any circuit in your main panel | The circuits wired to the switch |
| Overload risk | Managed by the panel | Highest: you keep the total under 3,840 W | Lower: only the chosen circuits |
| Rough cost | $1,299 plus installation | Inlet box $20 to $100; interlock installed $400 to $850 | Installed $400 to $1,300 |
| Electrician and permit | Yes | Yes; Bluetti's guide calls for listed transfer equipment or an approved interlock | Yes |
Bluetti price on its US store on November 14, 2026. Installed ranges are HomeGuide's (figures dated April 5, 2023); permits add $50 to $350. Your electrician's quote is the real number. Bluetti also sells an Apex 300 Home Integration Kit ($699); its listing says only that it ties the unit into home circuits, so ask Bluetti what is in it before you count on it.
The neutral question, plainly
Whether your transfer switch or interlock setup must switch the neutral depends on whether the Apex 300 bonds neutral to ground inside the unit, and Bluetti's Apex 300 manual does not say.
Bluetti's own hookup guide (October 29, 2026) says neutral bonding matters most: some sources bond the neutral, and others expect transfer equipment that switches it. Get the answer from Bluetti support in writing and hand it to your electrician before anything is bought.
What the 50 A outlet really delivers
Bluetti's manual rates the 14-50R at 50 A only in bypass mode, when grid or generator power passes through the unit. On battery alone, with the voltage selector at 240 V, it gives 120/240 V at 16 A: the unit's 3,840 W limit. So a 50 A inlet or switch is the right size for the plug, but the circuits you back up must add up to no more than 3,840 W running. At the 240 V setting the TT-30R drops to 16 A at 120 V. One Apex 300 holds 2.76 kWh and grows to 19.35 kWh with Bluetti's B300K batteries. Check your loads with the power outage backup calculator.
Buying one
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In stock at $1,499 on Bluetti's US site on November 14, 2026: Bluetti Apex 300 (opens in a new tab) We earn a commission if you buy through this link.
Weighing it against a cheaper 120 V unit? A 120 V-only unit cannot feed 240 V circuits on its own; see the four ways to connect a battery.
*Prices and specifications are from each manufacturer's US website, checked . Prices change often, sometimes daily during sales; the seller's page is the final word. Cycle ratings are the maker's own figures, measured to different end points, so treat them as rough guides.
Frequently asked questions
Does the Bluetti Apex 300 need the AT1 to connect to a house?
No. The Apex 300's 50 A NEMA 14-50R outlet can feed an inlet box with an interlock kit, or a manual transfer switch, installed by a licensed electrician with a permit. The AT1 ($1,299 on November 14, 2026) is Bluetti's automatic option: it switches over by itself and also manages a generator and rooftop solar.
Does the Apex 300's 50 A outlet give 50 amps?
Only when grid or generator power is passing through it. Bluetti's manual rates the 14-50R at 50 A in bypass mode, but on battery alone at the 240 V setting it gives 16 A, which is its 3,840 W limit. Size what is on the backed-up circuits to that.
Does a transfer switch for the Apex 300 have to switch the neutral?
It depends on whether the unit's output neutral is bonded to ground, and the Apex 300 manual does not say. Bluetti's own hookup guide says neutral bonding matters most: some sources bond the neutral and others expect transfer equipment that switches it. Ask Bluetti support which kind the Apex 300 is, in writing, and give the answer to your electrician before parts are bought.
Can one Apex 300 give 240 V?
Yes. Set its voltage selector to 240 V and the 14-50R outlet gives 120/240 V split-phase from a single unit, per Bluetti's manual. At that setting the TT-30R and the 20 A outlets stay at 120 V with lower limits.
How much does an Apex 300 home hookup cost?
Beyond the battery ($1,499 on November 14, 2026): an interlock kit installed runs $400 to $850 and a manual transfer switch installed $400 to $1,300, plus a permit ($50 to $350), by HomeGuide's ranges. Bluetti's AT1 is $1,299 before installation.
What we checked
We have not tested the Apex 300, the AT1 or any transfer switch with it.Everything below comes from the makers' own manuals, support articles and store pages, and from safety agencies, read on the dates shown.
- Bluetti Apex 300 user manual V3.1 (PDF) (read ): 14-50R: 50 A bypass, 16 A at 240 V on battery; TT-30R limits; voltage selector; no statement on neutral bonding
- Bluetti, How to hook up a generator to the house (Bluetti Team, Oct 29 2026) (read ): neutral bonding matters most; listed transfer equipment or an approved interlock; electrician, permits, never backfeed
- Bluetti AT1 Smart Distribution Panel product page (read ): price; automatic transfer; compatible with Apex 300 systems (up to three via Hub A1)
- Bluetti Apex 300 Home Integration Kit product page (read ): price; one-line description
- Bluetti Apex 300 product page (read ): price, stock, outlets
- HomeGuide, Generator transfer switch installation cost (read ): installed-cost ranges (figures dated April 5, 2023)
- CPSC, Portable generator hazards safety alert (PDF) (read ): backfeeding warning
- OSHA, Using portable generators safely (PDF) (read ): transfer switch by a qualified electrician
Keep the house running in an outage
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General information, not electrical advice. Codes and what inspectors accept differ by city and county. Prices, stock and specifications are copied from Bluetti's US website and manual on the dates shown and change often. Safety first: follow each maker's instructions and your local codes, use certified equipment, and have a licensed professional do any wiring. See our safety notes and disclaimer.