We Compared 4 Portable Power Stations With 1800W Inverters

The DELTA 3 Plus is the unit in this class built around the charger rather than the battery, and once you do the arithmetic that turns out to matter more than the 32Wh of capacity it gives away to the C1000.

The number that separates it#

Divide rated capacity by rated recharge time and you get charging power, which no listing publishes. Eighty percent of 1024Wh is about 819Wh, and returning that in 40 minutes is roughly 1,229W of charge going in.

Put that next to the load the unit is named for. Drawing 1800W and charging at 1,229W means about 1.5 minutes of grid time buys one minute of full-output running. On the DELTA 2, charging at roughly 768W, the same minute costs about 2.3 minutes. Over an afternoon of intermittent use that gap is the whole difference between the two.

Where the 1800W actually goes#

At a continuous 1800W, 1024Wh lasts 34 minutes on paper. Allow around 90% inverter efficiency and it is closer to 31. Nothing in this class runs a genuine 1800W load for an hour, and this unit, level with the DELTA 2 on capacity, is the shortest of the four.

That sounds worse than it is, because almost nothing draws 1800W continuously. A mitre saw cutting for ten seconds in every minute averages roughly 300W, and 1024Wh at 300W is about three and a half hours of shop time. The inverter rating covers the cut; the pack covers the day.

Why the cycle count is worth reading#

Rated capacity multiplied by rated cycles gives lifetime energy throughput. At 4,000 cycles and 1024Wh that is around 4,096kWh, the highest figure in this shortlist: a third more than the DELTA 2’s 3,072kWh and close to 30% more than the C1000’s 3,168kWh. If this is going to be emptied several times a week, that number describes the purchase far better than capacity does.

What it gives up#

The specification is a flat 1800W. The C1000 publishes 2400W of SurgePad headroom and both BLUETTI and the DELTA 2 publish 2700W modes, and while those last two only apply to resistive loads, the C1000’s margin does not carry that caveat. If the thing you are buying this for has a compressor in it, buying the unit with no published start-up margin is the wrong risk to take.

There is also no solar input figure in the specifications we compared. On a unit this focused on refill speed that is a real gap, because it means the fast-refill argument only holds where there is a wall outlet.

Who should buy it#

Anyone whose 1800W load is electronic, resistive or intermittent, who will cycle the unit hard, and who charges from mains. If the load has a motor, read the C1000 review instead.

The C1000 wins this shortlist on the one specification that behaves differently between brands, which is what happens above 1800W.

Surge headroom that survives contact with a motor#

An 1800W continuous rating is the floor. What a refrigerator, a well pump or a circular saw does at the instant it starts is pull several times its running draw for a fraction of a second, and that is what trips an inverter with no margin.

Three units here publish a bigger number. EcoFlow’s X-Boost and BLUETTI’s Power Lifting both reach 2700W by lowering output voltage so current stays within the inverter’s limits. For a kettle or a heater that is fine, because lower voltage just means less heat. For a motor it is useless, because the motor needs voltage to develop torque. Anker’s 2400W SurgePad is a lower headline figure and a more useful one.

So the practical ceiling on this unit is 2400W, and the practical ceiling on the two 2700W units is 1800W the moment the load has a motor in it.

The runtime maths#

1056Wh divided by an 1800W draw is 0.59 hours, or about 35 minutes. Allow around 90% inverter efficiency and call it 32. That is a minute more than either DELTA and three minutes less than the AC180, so even the longest runner in this class stops well inside an hour.

Where it gets useful is at real duty cycles. A full-size fridge averages roughly 150W once the compressor cycling is accounted for, and 1056Wh at 150W is about seven hours. The 1800W rating is not there to be sustained; it is there so the compressor starts.

Refilling without a wall outlet#

600W of solar input is the highest figure in this shortlist. At a theoretical 600W it would take 1056Wh divided by 600W, about 1.8 hours, to fill an empty pack. Panels in practice rarely hold much above 70% of their rating, so plan on somewhere near two and a half hours of good sun instead. Neither DELTA matches that ceiling, and the DELTA 3 Plus publishes no solar figure at all.

Where it comes second#

From the mains it is the slower option. Eighty percent of 1056Wh is about 845Wh, and returning that in 58 minutes is roughly 874W of charging power. The AC180 and the DELTA 3 Plus both return about 1,229W. If your usage pattern is empty it, refill it, empty it again in the same afternoon, that difference compounds.

The cycle rating is the other gap: 3,000 cycles at 1056Wh is around 3,168kWh of lifetime energy, well behind the 4,096kWh the DELTA 3 Plus is rated for.

Who should buy it#

Anyone whose reason for wanting 1800W is a motor, and anyone who will refill from panels rather than a socket. If neither applies, one of the faster-charging units here is the better buy.

Four units, one inverter rating, and the AC180 is the one that answers the question the rating implies: how long can this actually hold 1800W?

The answer, in minutes#

1152Wh divided by 1800W is 0.64 hours, about 38 minutes. Allow roughly 90% inverter efficiency and it is nearer 35. The two DELTAs manage about 34 minutes on paper and the C1000 about 35.

That is a four-minute spread across a whole product class, and it is the single most useful thing to know before buying one of these. An 1800W rating describes what the unit can start and hold, not what it can sustain for an evening. If your plan involves a continuous 1800W load for longer than half an hour, no unit here is the answer and you should be looking at a larger pack behind a bigger inverter.

Within the class, though, the AC180 gives you the most of it, and at more useful loads the same margin holds: at 900W it runs about 77 minutes where a 1024Wh unit runs 68, and at a 150W fridge average it covers about 7.7 hours against 6.8.

Refill speed that matches the drain#

Eighty percent of 1152Wh is about 922Wh, and putting that back in 45 minutes is roughly 1,229W of charging power. Expressed the way the load is expressed, a minute of running at full 1800W output costs about 1.5 minutes of charging. That is the joint best ratio here and it is more than half again as good as the DELTA 2’s.

Pair that with 3,500 rated cycles and the lifetime picture works out to about 4,032kWh of energy through the unit, which puts it within 2% of the highest figure in this shortlist.

The weight is not a footnote#

35.3 lb is what buys the extra capacity, and the arithmetic is unflattering: 32.6 watt-hours per pound against 37.9 for the DELTA 2 and 37.2 for the C1000. Against the DELTA 2 you are carrying 8.3 extra pounds for 128 extra watt-hours, which is about 15Wh for every pound added.

That is fine for a unit that sits by a desk or in a utility room and gets wheeled out once a season. It is a bad trade for anything that moves.

It is also the heaviest unit here by a clear margin: the next heaviest, the C1000, is 28.4 lb, so the AC180 asks for 6.9 lb more than anything else on this page.

The ceiling is lower than the sticker#

Power Lifting’s 2700W is a resistive-load figure reached by dropping output voltage. A heater or a kettle will take it. A fridge compressor will not, because it needs voltage to make torque. For motor loads, treat this unit as a flat 1800W and do not plan around the bigger number.

Who should buy it#

Stationary users who want the longest run this class offers and the fastest possible turnaround, and who will not be lifting it often. Anyone who needs to carry it, or who expects to grow the system later, is better served elsewhere on this page.

Most units in this class are bought for one demanding appliance. The DELTA 2 is the one bought because there are eight things that all need to stay on.

Ports are a specification, not a detail#

Fifteen ports with six AC outlets is the widest published spread here. The C1000 also gives six AC outlets across 11 ports and the AC180 gives four across 11. The DELTA 3 Plus specification we compared publishes no port breakdown at all, only a claim that it runs 13 appliances at once, so it cannot be placed on this measure.

That matters more than it looks, because it changes how the 1800W is used. Nothing in this class runs at 1800W for long, but almost everything in a house runs at 40W to 300W. Six outlets means a fridge, a router, a modem, two lamps and a laptop charger all sit behind the inverter at once without a daisy-chained strip, and the combined draw of that list is a few hundred watts.

At a 300W combined load, 1024Wh is about three and a half hours. At 150W it is close to seven. The inverter headroom is there so the fridge compressor can start inside that mix without dropping the rest.

The expansion path is the real argument#

1024Wh standard, 3040Wh with extra batteries, and the inverter, screen and outlets stay the same. Nearly tripling storage without replacing the unit is a genuinely different proposition from the AC180, which cannot be expanded at all.

At 3040Wh, that 300W mixed household load runs for roughly ten hours rather than three and a half. The 1800W rating never changes; what changes is how long you can stay behind it.

Where the arithmetic turns against it#

Charging is the weak point and it is not close. A full 1024Wh in 80 minutes is roughly 768W of energy going back in. Stated against the load, one minute of running at full 1800W output costs about 2.3 minutes of charging. The DELTA 3 Plus and the AC180 both do it in about 1.5.

If power comes back in half-hour windows, this unit recovers around 384Wh in each one. The AC180 recovers close to 615Wh in the same window. Over a day of intermittent supply that gap decides how much stored energy you actually have.

The cycle rating is the other soft spot. 3,000 cycles at 1024Wh is about 3,072kWh of lifetime energy, the smallest number in this shortlist.

The 2700W is not what it looks like#

X-Boost reaches its figure by reducing output voltage so current stays inside the inverter’s limit. A heater or a kettle does not mind. A motor does, because torque comes from voltage. For a compressor, a pump or a saw, this unit is a flat 1800W and should be planned that way.

Who should buy it#

Households wanting one unit behind several modest loads, with room to add storage later. Anyone whose priority is turning the unit round quickly should look at the DELTA 3 Plus or the AC180 instead.