BLUETTI Apex 300 review
BLUETTI Apex 300 Home Battery Backup (2,764.8Wh)
By Tom Calder
Less a power station than the start of a home battery: 2,764.8Wh built in and 3,840W of output from UK sockets, expandable to 19.35kWh with up to six B300K batteries, or 58kWh with three units on a Hub A1. It takes 2,400W of solar through two inputs, refills from the mains in about 70 minutes, and can restart from solar after running flat. The base unit has mains sockets only (USB and 12V need the £249 Hub D1), it weighs 38kg, and its 20ms switchover is slower than the Elite range's 10ms. Its £1,599 on 10 October 2026 was a sale price (from £1,899) due to end on 14 October.
- Best for
- A home battery you can grow from one day to several
- Skip it if
- You want to carry it
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- 3,840W from UK sockets
- Expands to 19.35kWh
- 2,400W solar input
Worth knowing
- USB and 12V need a £249 hub
- 38kg: it stays put
- 20ms switchover, not 10ms
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Our review
BLUETTI sells the Apex 300 as the first block of a home battery rather than a finished portable unit. 2,764.8Wh and 3,840W from UK sockets are generous, but what sets it apart is that six B300K packs can take it to 19.35kWh and three units can be paralleled. It suits someone planning a permanent installation who will grow it over time, not someone who wants one box with every port on it.
What the numbers mean
2,764.8Wh is 2.8 units of electricity, of which about 2,100Wh reaches the sockets by our planning method (90% depth of discharge, 85% inverter efficiency). 3,840W is shared across the sockets, each good for a full 13A, and BLUETTI's Power Lifting mode stretches that to 7,680W for purely resistive loads such as kettles and heaters. The LFP cells are rated for 6,000 cycles to 80% capacity, matching the best rating on this site. The manual puts the unit's own consumption at about 20W, hence the ECO mode that cuts outputs under light load.
In a UK power cut
By our runtime method over the appliance-draw dataset, a fridge-freezer runs 35 to 96 hours, a router 3 to 4 days, a CPAP on blower alone 2 to 6 days (25 to 68 hours with a heated humidifier), a laptop 26 to 53 hours, a television 9.5 to 49 hours and a gas combi boiler's electrics 16 to 47 hours. The fridge-freezer, router, four LED bulbs and a phone together manage 13 to 38 hours; with the combi boiler added, 7.5 to 23 hours. Boilers are hard-wired, so that needs an electrician's changeover first. At the 20W BLUETTI quotes for the unit's own draw, rather than our 10W, the fridge-freezer gets 30 to 66 hours and the router 2 to 3 days. A 3kW kettle runs normally and costs about 50Wh a minute, roughly 2.4% of the usable battery.
ECO mode is on by default and the manual says to disable it when powering small devices under 60W or anything critical, which describes a router or CPAP. And there are no USB or 12V outputs on the unit itself: those need BLUETTI's Hub D1, so phones charge from a plug-in charger.
How it compares
The BLUETTI Elite 300 holds slightly more at 3,014.4Wh, gives 2,400W, weighs 26.3kg, switches over in 10ms rather than 20ms and has USB-C and 12V ports built in; it cannot be expanded. The EcoFlow DELTA 3 Max Plus is 2,048Wh and 3,000W at 22.1kg and grows to 10kWh. The EcoFlow DELTA Pro 3 is the other home-battery candidate: 4,096Wh and 4,000W built in, 51.5kg, expandable to 12kWh. See BLUETTI's range.
Living with it
The AC charging port takes 2,300W, so a full charge from a wall socket takes at least an hour and a quarter even before losses; BLUETTI's 3,840W Turbo figure (80% in 45 minutes) needs the Hub A1. Two XT60 solar inputs accept 1,200W each at 12 to 60V, and the car cable manages 96W from a 12V socket. Charging from empty costs about 73p per full charge at Ofgem's October to December 2026 cap rate of 26.32p per kWh, before losses. Silent mode caps input at 500W; BLUETTI publishes no decibel figure. At 38kg and 525 by 327 by 320mm it stays where it is installed. The app uses Wi-Fi and Bluetooth, BLUETTI's specification table gives a five-year warranty, and BLUETTI UK accepts returns within 30 days on unused units.
Safety
It is IP20, so indoors only, and the manual says to charge it in a well-ventilated space and keep it dry. Charging is allowed between 0°C and 40°C, discharging from -20°C to 40°C, so a frosty garage can stop it recharging even though it still supplies power. For storage BLUETTI says 40 to 60% charge, between -10°C and 40°C and below 35°C if stored for more than a month, with a full cycle every three months. The manual specifies a dry powder extinguisher and, for grid connection, a 50A single-pole overcurrent device, an electrician's job. Household basics are in our lithium battery fire safety guide.
Our verdict
Buy it if you are building towards a multi-day home battery, will add B300K packs or solar, and want a 6,000-cycle battery built for daily cycling. Do not buy it as a one-box power cut kit: the 20W own draw, the ECO mode trap for small loads and the missing USB and 12V ports all work against that use, and the Elite 300 does the one-box job better at two thirds of the weight. What size power station do I need helps you decide.
A researched review, built from the maker's specs, manual and UK listings; facts checked 21 Oct 2026. Sources: BLUETTI UK — Apex 300 Home Battery Backup product page; BLUETTI — Apex 300 user manual V3.0 (specifications, charging modes, ECO mode, expansion, storage); BLUETTI UK support — Apex 300 (manual download, accessories); BLUETTI UK — return and refund policy (30 days); Ofgem — energy price cap unit rates and standing charges (1 October to 31 December 2026).
Who shouldn't buy this
Don't buy it if you want to carry it: at 38kg it lives in one place, and the Elite 300 gives 3kWh at 26kg.
Key specs
| Capacity | 2,764.8 Wh |
| Output | 3,840 W |
| Weight | 38 kg |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for A whole household through a day-long power cut — fridge-freezer, boiler controls, router, lights and phones — in a fixed-capacity unit built to last.
Best for Whole-home backup during power cuts, and off-grid trips
as of 21 Oct 2026, 10:37 BST · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Several days of whole-home essentials and heavy kitchen appliances at once, if you can handle a wheeled 51.5kg unit.
Questions
Can the BLUETTI Apex 300 run a fridge-freezer?
Yes. By the site's runtime method a fridge-freezer averaging 12 to 51W runs for 35 to 96 hours on the 2,764.8Wh battery, with the ECO mode switched off so the socket is not cut between compressor cycles.
Does the Apex 300 have USB ports?
No. The base unit has AC sockets only, and BLUETTI's manual says the Hub D1 accessory is required for DC output such as USB and 12V.
How long does the Apex 300 take to charge?
The AC charging port takes 2,300W, so a full charge from a wall socket cannot take less than about an hour and a quarter; BLUETTI quotes 80% in 45 minutes at 3,840W, but that needs the Hub A1. Solar at 2,400W reaches 80% in about 55 minutes.
How many B300K batteries can the Apex 300 take?
Up to six, which BLUETTI's manual puts at 19,353.6Wh in total. Two or three Apex 300 units can then be paralleled through a Hub A1, up to 11,520W and 58,060.8Wh with eighteen batteries.
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