These are the two largest units in the range and they answer completely different questions. The Elite 400 asks how much energy you can buy in one box. The Apex 300 asks how big a system you might eventually want. If you pick the wrong one, the mistake is expensive and not fixable later.
The specs, side by side
| Apex 300 | Elite 400 | |
|---|---|---|
| Base capacity | 2,764.8Wh | 3,840Wh |
| Maximum capacity | 19,353.6Wh | 3,840Wh (fixed) |
| Continuous output | 3,840W | 2,600W |
| Surge | 7,680W | 3,900W |
| Voltage | 120V + 240V | 120V only |
| Solar input | 2,400W | 1,000W |
| UPS switching | 0ms or 20ms | 15ms |
| Rated cycles | 6,000+ | 3,000+ |
| Weight | 83.8 lb | 86 lb, wheeled |
| Expansion | 6× B300K | None |
| Typical price | Higher | Lower |
The Apex 300 wins eight rows. The Elite 400 wins three. And yet for a large number of buyers the Elite 400 is still the right purchase, because two of those three rows are the ones they'll actually feel.
The case for the Elite 400
1,075Wh more, out of the box, for less money
If this is a one-time purchase, that's roughly 40% more energy for a lower price. A fridge, lights, Wi-Fi and phone charging at around 600W combined runs about 5.4 hours on the Elite 400 against roughly 4 on the Apex — and considerably longer once you account for a fridge cycling rather than drawing continuously.
The wheels genuinely change things
A telescoping handle and two wheels turn 86 lb into something owners routinely move alone across grass and hard floors. The Apex 300 is 83.8 lb with no trolley. If the unit will migrate between a garage, a house and a vehicle, that difference is felt every single time.
Buy the Elite 400 if this is your last purchase
3,840Wh in one wheeled box, 40% more than the Apex base, for less money — provided you never need 240V.
The case for the Apex 300
240V, which capacity cannot substitute for
This is the row that ends the argument for some buyers. A well pump, electric dryer, electric range or EV charger runs on 240V, and the Elite 400 cannot supply it at any state of charge. Go and look at your breaker panel: anything on a double-width breaker is 240V. If something critical sits there, the Elite 400 is simply not a candidate.
It scales, and the Elite 400 does not
Six B300K packs take the Apex to 19,353.6Wh, and output climbs from 3,840W to 6,240W with them. Three units in parallel reach 58kWh. The Elite 400 is 3,840Wh forever. Buying it and later needing more means buying a second unit rather than a battery. Our guide to expandable systems covers why that distinction matters.
More than twice the solar input
2,400W against 1,000W, and the Elite 400's figure is harder to reach than it looks — its charge controller caps at 20A across a 12–60V window, and those limits bind before the wattage does. One owner running 800W of panels reported being unable to hit the rated input. If solar is your primary recharge route rather than a supplement, this gap is decisive. See our solar input guide.
Double the cycle life
6,000+ against 3,000+. For a unit that will cycle daily in an off-grid or heavy-backup role, that's the difference between roughly sixteen years and eight.
Buy the Apex 300 if you need 240V or growth
Dual-voltage output, 2,400W solar, 6,000+ cycles and expansion to 19.4kWh on a single unit.
How to decide in one question
Go and look at your breaker panel. If anything you need to back up sits on a double-width 240V breaker, the decision is made — it's the Apex 300, and capacity is irrelevant to that choice.
If everything critical is 120V, then ask whether this is a finished purchase or a first step:
- Finished purchase, 120V only, want maximum energy. Elite 400.
- Will move it between rooms or into a vehicle. Elite 400, for the wheels.
- Building toward home backup or off-grid. Apex 300.
- Solar is the main recharge route. Apex 300, comfortably.
- Protecting a server, NAS or medical equipment. Apex 300, for the 0ms mode.
Frequently asked
01 Which has more capacity out of the box? +
The Elite 400, at 3,840Wh against the Apex 300's 2,764.8Wh. But the Apex 300 expands to 19,353.6Wh with six B300K batteries, while the Elite 400 has no expansion option at all.
02 Which one can run 240V appliances? +
Only the Apex 300. It outputs simultaneous 120V and 240V, which is what a well pump, electric dryer, electric range or EV charger needs. The Elite 400 is 120V only, regardless of its larger battery.
03 Which is easier to move? +
The Elite 400, because of its telescoping handle and wheels. Owners describe pulling it like rolling luggage. It still weighs 86 lb and Bluetti recommends three people for a vertical lift, so stairs are hard work either way. The Apex 300 is 83.8 lb without wheels.
04 Which charges faster from solar? +
The Apex 300, by a large margin. It accepts 2,400W of solar input, expandable to 6,400W, against the Elite 400's 1,000W. The Elite 400's solar input is also constrained by a 20A and 12-60V controller limit that binds before the wattage figure does.
05 Which should I buy for whole-home backup? +
The Apex 300. Dual-voltage output, sub-10ms switching in its fast mode, and an expansion path to 19.4kWh on one unit or 58kWh across three. Running house circuits still requires a transfer switch installed by an electrician.
06 Is the Elite 400 ever the better buy? +
Yes, when it is your final purchase rather than the first piece of a system. If you need maximum capacity in one box, will never need 240V, and want to wheel it between rooms or into a vehicle, the Elite 400 gives you more energy for less money.
Keep reading
Bluetti Apex 300
2,764Wh, dual-voltage output and expansion to 19.4kWh — plus the UPS figure Bluetti states two ways.
Bluetti Elite 400
3,840Wh on wheels — and three headline claims that don't survive independent testing.
Bluetti Elite 300
3,014Wh, 6,000+ cycles and RV ports, in a lighter body than either of these.
Specifications are taken from Bluetti's published product pages, checked September 2026. Owner reports of unreachable solar input are drawn from published independent reviews rather than our own testing. Running house circuits from either unit requires a transfer switch installed by a licensed electrician.