The Jackery wins, and it is the unit to buy if you
are buying one. It stored just under 283 Wh, more than anything else here and
97% of its rating — the closest any unit came to its own claim. Its inverter
held 385.9 W, the most of any 300 W class unit, it charges at 86.7 W from a
12V socket and 91 W from the wall, its 12V output is the strongest here at
155.5 W, and it does all that at 7.185 lb with the second quietest fan in the
review at 47.4 dB. At $229 it is not cheap.
If you need real wattage, the Bluetti and VTOMAN are the only two units that
deliver it, holding 614 W and 620 W. The Bluetti is the better of the pair for
most people: it is the quietest unit in the review at 45.7 dB, it recharges
faster than anything else at 269 W from the wall and 82 W from solar, and it
will charge at full speed while running a load. Its weakness is capacity —
236.17 Wh, second worst measured here. The VTOMAN stores more at 271.27 Wh and
never shut down at all under load, but it weighs 14.1 lb, three times the
lightest unit.
For value the $150 GRECELL stores 272.57 Wh, within 10 Wh of the winner for $79
less, and runs quietly at 49.1 dB. Know its two limits: rated at 330 W, it
trips at 276.5 W, and it is one of only two units that cannot be used while
charging. The $170 Anker is worth considering for a completely different job —
it has no AC outlet at all, but it delivers 92 W over USB-C, 213 W across three
ports at once, and recharges at 213 W, which makes it the best choice if
laptops and phones are all you are powering.
Three to avoid. The $215 ZeroKor could not run a 225 W heat lamp despite a
300 W rating, shut down when a drill was triggered, and stored 79% of its
advertised capacity. The ALLWEI is otherwise decent but also shut itself down
the instant a drill was pulled, which rules it out for tools. And the $110
Bailibatt, while it has a surprisingly strong inverter at 368.7 W, delivered
just 75% of its rated capacity, charges at 32 W from the wall and 25 W from
12V, and its USB-C cannot reach 20V. The broader lesson holds across all nine:
the watt-hour number on the box was optimistic every single time.