Energy density: what Wh/kg tells you about a power station
Energy density is stored energy divided by weight, in watt-hours per kilogram. For a whole power station it says how many kilograms you carry for each watt-hour you get. Across the units covered here it runs from about 60 to 114 Wh/kg: Jackery Explorer 2000 v2 stores 2,042 Wh at 39.5 lb (17.9 kg), which is 114 Wh/kg, while Anker SOLIX F3800 sits at 64 Wh/kg. The full ranking is below, computed from each maker's published capacity and weight.
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What the number measures
The calculation is simple: rated capacity in watt-hours divided by the unit's weight in kilograms. A 1,000 Wh station weighing 10 kg scores 100 Wh/kg. Two units with the same capacity can differ by several kilograms, and this figure makes that difference comparable across sizes.
Battery makers quote a different, much higher figure. Cell density counts only the cells: lithium iron phosphate cells typically land somewhere between 90 and 160 Wh/kg, nickel manganese cobalt cells higher still. A power station adds an inverter, a charge controller, a battery management board, fans, sockets, a display and a rigid case. All of that weighs something and stores nothing, which is why no complete unit in this catalog reaches the density of its own cells.
So the whole-unit figure is the honest one for a buyer. It folds packaging efficiency, inverter size and case design into a single number, measured the way you will experience it: on your arm.
Why it matters when you move the unit
If the station lives next to the fridge as a backup, density barely matters. If it goes into a car boot, up a flight of stairs, across a campsite or in and out of a van every weekend, it matters on every trip.
The difference is real. Jackery Explorer 2000 v2 and Anker SOLIX F2000 (PowerHouse 767) both store around 2 kWh: 2,042 Wh against 2,048 Wh. The first weighs 39.5 lb (17.9 kg), the second 67.2 lb (30.5 kg). That is the gap between a unit one person carries with a handle and a unit you wheel. Same energy, very different weekend.
Density is also a fair way to compare units of different sizes. A larger station is always heavier, but a well-designed one is not heavier per watt-hour. When two candidates are close on capacity and output, the one with the higher Wh/kg is simply the more efficient package to carry.
Every unit ranked by Wh/kg
The table uses the rated capacity and weight published by each maker, the same figures shown on every model page. Weight is the bare unit, without cables or a charging brick. Click a model name for its full specification and score.
| # | Brand | Model | Wh/kg | Capacity | Weight | Chemistry | Actions |
|---|---|---|---|---|---|---|---|
| 1 |  | Jackery Explorer 2000 v2 | 114.1 | 2,042 Wh | 39.5 lb (17.9 kg) | LiFePO4 | Check price |
| 2 |  | Anker SOLIX C2000 Gen 2 | 108.4 | 2,048 Wh | 41.7 lb (18.9 kg) | LiFePO4 | Check price |
| 3 | | Anker SOLIX C300 DC | 102.9 | 288 Wh | 6.2 lb (2.8 kg) | LiFePO4 | Check price |
| 4 | | Anker SOLIX C200 DC | 101.1 | 192 Wh | 4.2 lb (1.9 kg) | LiFePO4 | Check price |
| 5 |  | EcoFlow DELTA 3 Max | 100.9 | 2,048 Wh | 44.8 lb (20.3 kg) | LFP | Check price |
| 6 | | Jackery Explorer 1000 | 100.2 | 1,002 Wh | 22.0 lb (10.0 kg) | Lithium-ion | Check price |
| 7 | | Jackery Explorer 1000 v2 | 99.1 | 1,070 Wh | 23.8 lb (10.8 kg) | LiFePO4 | Check price |
| 8 | | EcoFlow DELTA 3 Max Plus | 92.7 | 2,048 Wh | 48.7 lb (22.1 kg) | LFP | Check price |
| 9 | | Jackery Explorer 300 | 91.6 | 293 Wh | 7.1 lb (3.2 kg) | Lithium-ion | Check price |
| 10 | | Anker SOLIX C1000 Gen 2 | 90.7 | 1,024 Wh | 24.9 lb (11.3 kg) | Not published | Check price |
| 11 |  | BLUETTI AC180P | 90.0 | 1,440 Wh | 35.3 lb (16.0 kg) | LiFePO4 | Check price |
| 12 | | BLUETTI Elite 100 V2 | 89.0 | 1,024 Wh | 25.0 lb (11.5 kg) | LiFePO4 | Check price |
| 13 | | EcoFlow DELTA 2 Max | 89.0 | 2,048 Wh | 50.0 lb (23.0 kg) | LFP | Check price |
| 14 | | BLUETTI Elite 200 V2 | 85.7 | 2,073.6 Wh | 53.4 lb (24.2 kg) | LiFePO4 | Check price |
| 15 | | EcoFlow DELTA 2 | 85.3 | 1,024 Wh | 27.0 lb (12.0 kg) | LFP | Check price |
| 16 | | BLUETTI AC70P | 84.7 | 864 Wh | 22.5 lb (10.2 kg) | LiFePO4 | Check price |
| 17 | | EcoFlow DELTA 3 Classic | 84.6 | 1,024 Wh | 26.6 lb (12.1 kg) | LFP | Check price |
| 18 | | EcoFlow RIVER 2 Max | 84.2 | 512 Wh | 13.4 lb (6.1 kg) | LFP | Check price |
| 19 | | EcoFlow DELTA 3 | 81.9 | 1,024 Wh | 27.6 lb (12.5 kg) | LFP | Check price |
| 20 | | EcoFlow DELTA 3 Plus | 81.9 | 1,024 Wh | 27.6 lb (12.5 kg) | LFP | Check price |
| 21 | | Anker SOLIX C1000 | 81.9 | 1,056 Wh | 28.4 lb (12.9 kg) | LiFePO4 | Check price |
| 22 | | EcoFlow DELTA Pro 3 | 79.5 | 4,096 Wh | 113.5 lb (51.5 kg) | LFP | Check price |
| 23 | | BLUETTI AC70 | 75.3 | 768 Wh | 22.5 lb (10.2 kg) | LiFePO4 | Check price |
| 24 | | EcoFlow RIVER 2 | 73.1 | 256 Wh | 7.8 lb (3.5 kg) | LFP | Check price |
| 25 | | BLUETTI AC50P | 73.0 | 504 Wh | 15.1 lb (6.9 kg) | LiFePO4 | Check price |
| 26 | | BLUETTI Apex 300 | 72.8 | 2,764.8 Wh | 83.8 lb (38.0 kg) | LiFePO4 | Check price |
| 27 | | BLUETTI AC200L | 72.4 | 2,048 Wh | 62.4 lb (28.3 kg) | LiFePO4 | Check price |
| 28 | | BLUETTI AC180 | 72.0 | 1,152 Wh | 35.3 lb (16.0 kg) | LiFePO4 | Check price |
| 29 | | EcoFlow RIVER 3 | 70.0 | 245 Wh | 7.7 lb (3.5 kg) | LFP | Check price |
| 30 | | Anker SOLIX C300 | 69.7 | 288 Wh | 9.1 lb (4.1 kg) | LiFePO4 | Check price |
| 31 | | Anker SOLIX F2000 (PowerHouse 767) | 67.1 | 2,048 Wh | 67.2 lb (30.5 kg) | LiFePO4 | Check price |
| 32 | | BLUETTI AC50B | 66.9 | 448 Wh | 14.8 lb (6.7 kg) | LiFePO4 | Check price |
| 33 | | Anker SOLIX F3800 | 64.0 | 3,840 Wh | 132.3 lb (60.0 kg) | LiFePO4 | Check price |
| 34 | | EcoFlow RIVER 3 Plus | 60.9 | 286 Wh | 10.4 lb (4.7 kg) | LFP | Check price |
The five lightest per watt-hour
Jackery Explorer 2000 v2 leads at 114 Wh/kg: 2,042 Wh for 39.5 lb (17.9 kg). It has no expansion port, and that is part of why it stays light: everything it can ever store is already in the box.
Anker SOLIX C2000 Gen 2 follows at 108 Wh/kg, with 2,048 Wh at 41.7 lb (18.9 kg). It is the densest unit here that also accepts an extra battery.
Anker SOLIX C300 DC and Anker SOLIX C200 DC come next at 103 Wh/kg and 101 Wh/kg. Neither has an AC inverter, which removes the heaviest piece of electronics. Compare Anker SOLIX C300 DC with its AC sibling Anker SOLIX C300: same 288 Wh, but 9.1 lb (4.1 kg) instead of 6.2 lb (2.8 kg), so 70 Wh/kg. That gap is roughly what an inverter costs you in weight at this size.
EcoFlow DELTA 3 Max completes the top five at 101 Wh/kg, with 2,048 Wh at 44.8 lb (20.3 kg).
Chemistry matters less than you would expect
Lithium iron phosphate cells are less dense than nickel manganese cobalt cells, so you might expect the older NMC units to dominate this table. They do not. Jackery Explorer 1000 uses Lithium-ion cells and scores 100 Wh/kg. Its LiFePO4 successor Jackery Explorer 1000 v2 scores 99 Wh/kg, while storing slightly more and quoting a much higher cycle rating. The top of the ranking is entirely LiFePO4.
Once cells make up only part of the weight, packaging decides more than chemistry. Recent designs use larger cells, fewer internal connectors and lighter cases, and that closes the gap. The trade-offs between the two chemistries are explained on the LiFePO4 against NMC page.
What pulls the figure down
Large inverters. Anker SOLIX F3800 delivers 6,000 W of continuous AC output and weighs 132.3 lb (60.0 kg). It is built to be wheeled, not carried, and the heavy power electronics show up at 64 Wh/kg.
Wheels, handles and rugged cases. Units designed to roll carry the weight of their own chassis.
Small capacities. A socket panel, a screen and an inverter weigh about the same whatever the battery behind them, so the fixed weight is a bigger share of a small unit. EcoFlow RIVER 3 Plus sits at 61 Wh/kg and EcoFlow RIVER 3 at 70 Wh/kg, near the bottom of the ranking despite being the units people most often carry.
A low figure is not a defect. It is a measure of what the unit asks of your back, to set against what it gives you in output, ports and capacity.
What Wh/kg does not tell you
It says nothing about how much of the stored energy reaches your devices. Inverter losses take a share of every watt-hour drawn through the AC sockets, so usable energy is always below the rating. The run time calculator accounts for that.
It also says nothing about air travel. Airline rules limit batteries by watt-hours per battery, not by weight, and every unit here is far above the limit for passenger baggage, the smallest being EcoFlow RIVER 3 at 245 Wh.
And it does not replace the other criteria. Density is the portability axis of this site's scoring method, one criterion among several alongside output, cycle life, charging and ports. Read it as the tie-breaker between units that already do what you need.
Common questions
What is a good Wh/kg for a portable power station?
Among the units covered here, anything above 100 Wh/kg is at the top of the market, 80 to 100 is typical of a modern LiFePO4 design, and below 70 usually means a large inverter, a wheeled chassis or a very small capacity. Jackery Explorer 2000 v2 currently leads at 114 Wh/kg.
Why is the Wh/kg of a power station lower than the battery cell rating?
The cell figure counts only the cells. A complete station also carries an inverter, a charge controller, a management board, cooling, sockets and a case, none of which store energy. The whole-unit figure is what you actually carry.
Are LiFePO4 power stations heavier than NMC ones?
At cell level, yes. At unit level, not necessarily: the densest stations on this site are all LiFePO4, and Jackery Explorer 1000 v2 at 99 Wh/kg is within a point of the NMC Jackery Explorer 1000 at 100 Wh/kg.
Does an extra battery change the Wh/kg?
Each extra battery has its own density, usually higher than the main unit because it carries no inverter. The ranking here covers the main unit alone, as sold, because that is what you carry when you leave the expansion at home.
How is the ranking calculated?
Rated capacity in watt-hours divided by the maker's published weight in kilograms, for every unit on the site, with no adjustment. The source figures are the ones shown on each model page and are linked to the maker's specification.