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BLUETTI AC50B Review
448Wh of storage, 700W continuous output, LiFePO4 cells. Listed at $399 at BLUETTI.
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The BLUETTI AC50B is a portable under 600wh unit holding 448Wh. At $0.89 per watt-hour it is priced about where the rest of the band sits. It uses LiFePO4 cells rated for 3,000 cycles, so it is built to be kept rather than replaced. It lists at $399 against an $528 MSRP.
Manufacturer price at the time of writing. We may earn a commission, which never changes what the figures say.
Arithmetic on the maker’s published specification; we have not tested this unit. Method and the full comparison are in our power station price index.
What the BLUETTI AC50B will run, and for how long
Runtimes below are calculated from the 448Wh rated capacity, derated to 85% for AC loads and 92% for USB and 12V loads to cover inverter and conversion losses. They are arithmetic, not lab measurements, but they are the same arithmetic applied to every unit we track, so the comparison holds. Anything drawing more than the 700W continuous rating is left off the list because this unit cannot carry it, though the 1,000W surge rating covers brief startup spikes from motors and compressors.
| Load | Estimated runtime |
|---|---|
| Phone charge (12Wh) | 34 charges |
| Wi-Fi router (10W) | 38 hr |
| LED work light (10W) | 41 hr |
| CPAP, humidifier off (40W) | 9 hr 31 min |
| Laptop (60W) | 6 hr 21 min |
| 12V portable fridge (45W avg) | 8 hr 28 min |
| 55-inch TV (90W) | 4 hr 14 min |
Real figures land below these. A fridge cycles rather than drawing continuously, and cold weather costs a lithium pack usable capacity, so treat the table as the ceiling rather than the expectation.
Charging and power delivery
It accepts 580W from a wall outlet. Maximum solar input is 200W. At 70% of that rating, which is what a fixed panel realistically delivers across a good day, a full charge from empty is roughly 3 hr 12 min of usable sun. Switchover to battery is rated at 20ms, fast enough to keep a desktop or a router from dropping.
BLUETTI AC50B specifications
Manufacturer figures, gathered so you can read them against everything else we track rather than against the marketing page they came from.
| Capacity | 448Wh |
| Continuous AC output | 700W |
| Surge / peak | 1,000W |
| Cell chemistry | LiFePO4 |
| Rated cycle life | 3,000 cycles |
| Weight | 14.8 lb |
| Max solar input | 200W |
| Max AC input | 580W |
| UPS switchover | 20ms |
| Warranty | 5 years |
| Price at BLUETTI | $399 |
| Cost per watt-hour | $0.89 |
How the BLUETTI AC50B compares
The closest units we track from other manufacturers in the same band, matched on capacity rather than on price.
| BLUETTI AC50B | Goal Zero Yeti 400 Lithium | Goal Zero Yeti 400 | |
|---|---|---|---|
| Capacity | 448Wh | 428Wh | 400Wh |
| Output | 700W | 120W | 120W |
| Cycle life | 3,000 cycles | 500 cycles | — |
| Weight | 15 lb | 16 lb | 29 lb |
| Price | $399 | $599.95 | $449.95 |
| Cost per watt-hour | $0.89 | $1.40 | $1.12 |
Where the BLUETTI AC50B sits in its band
We track 36 units in the portable under 600wh band with both a price and a published capacity. They run from $118 to $599.95, and from 128Wh to 576Wh. On cost per watt-hour the BLUETTI AC50B ranks 17 of 36, where 1 is the cheapest capacity in the band. That is mid-table: neither the bargain of the band nor the unit you would call overpriced. Ranking on cost per watt-hour deliberately ignores build quality, port selection and warranty, so read it as one input rather than as the answer.
Alternatives to the BLUETTI AC50B
Units we track in the same band that are close enough to be genuine substitutes, matched on capacity. Each links to its own review.
- Goal Zero Yeti 400 Lithium review — 428Wh, 120W output, listed at $599.95, $1.40 per watt-hour, dearer capacity than the BLUETTI AC50B.
- BLUETTI Pioneer 50 (AC60) review — 403Wh, 600W output, listed at $599, $1.49 per watt-hour, dearer capacity than the BLUETTI AC50B.
- Goal Zero Yeti 400 review — 400Wh, 120W output, listed at $449.95, $1.12 per watt-hour, dearer capacity than the BLUETTI AC50B.
- EcoFlow RIVER 2 Max 500 review — 499Wh, 500W output, listed at $309, $0.62 per watt-hour, cheaper capacity than the BLUETTI AC50B.
Who the BLUETTI AC50B suits
It is a sensible buy for weekend camping, a CPAP overnight, phones and laptops, and keeping a router alive through a short outage. It is the wrong tool for anything with a heating element, and any attempt to run a fridge for more than a day.
BLUETTI AC50B questions
How long will the BLUETTI AC50B run a fridge?
A full-size fridge averages about 50W once you account for the compressor cycling on and off. From 448Wh, derated to 85% for inverter losses, that is roughly 7 hr 37 min on a full charge. A 12V portable fridge draws less and will run considerably longer.
Can the BLUETTI AC50B be charged by solar?
Yes. It accepts up to 200W of solar input. Panels rarely hit their rated figure in the field, so plan on about 70% of the panel rating across a clear day.
Does the BLUETTI AC50B work as a UPS?
It switches to battery in about 20ms. That is quick enough for a desktop computer, a router or a modem, all of which tolerate a gap in that range without rebooting.
What warranty does the BLUETTI AC50B carry?
BLUETTI covers it for 5 years, and rates the cells for 3,000 charge cycles. Cycle life and warranty are different promises, and the cycle figure is the one that tells you how long the pack stays useful.
Is the BLUETTI AC50B worth it?
At $399 it works out at $0.89 per watt-hour. It costs less per watt-hour than the median unit in its band, which is the strongest argument in its favour. Read the comparison table above against the two closest rivals before deciding.
How we assess these
Every figure on this page comes from the manufacturer, and every derived number, cost per watt-hour and estimated runtime, is calculated the same way for all 437 products we track. That is what makes the comparison meaningful: we are not scoring units against a private impression of them, we are putting published figures side by side and doing the arithmetic in public. Where a manufacturer stays quiet, we say so rather than filling the gap.