Independent comparisons · Updated
Every portable power station, measured on one scale.
The Pure Sine Index scores power stations from EcoFlow, Anker SOLIX, Jackery, Bluetti and DJI with the same math, then shows the charts so you can check it yourself. No brand pays for a score.
01The Index
All the units. Sorted however you want.
Tap any row for the full spec sheet and my take. Check up to three to compare them side by side.
Street prices are typical US prices tracked in and move constantly. Values marked ≈ are estimates until the manufacturer confirms them. Recharge is the fastest wall-outlet mode to 100%, per the manufacturer.
02The Charts
Where the value actually is.
Every dot is a power station. The diagonal lines mark constant price per watt-hour, so anything sitting low and to the right is getting you more battery for the money.
Capacity vs. street price
Dot size is continuous output. Dashed lines mark $0.30, $0.50 and $0.80 per Wh. Both axes are logarithmic.
Price per watt-hour
Lower is better.
03The Quiz
Six questions. One answer.
Tell me how you'll actually use it. The quiz checks every unit against your loads, your budget, and how far you'll carry it, then picks the best fit, with two backups.
04Will's Picks
If you just want the answer.
05About
Hey, I'm Will.
I started Pure Sine Index because every “best power station” list I found was either a wall of affiliate links or a spec sheet copied from Amazon.
I wanted one place where every unit gets measured the same way. Same formula, same charts, no matter whose logo is on the front. Then I wanted to say what I actually think, plainly, because a spec sheet won't tell you that a 50-pound “portable” stops being portable the second time you carry it up a hill.
The score is math. The takes are mine. When I get my hands on a unit, I'll tell you, and I'll update the page with what I find.
— Will Wright
06Method
How the score works.
Every unit is scored 0–100 against every other unit in the index. Nothing is hand-tuned, and nothing is for sale.
What does “pure sine” mean?
Wall power is a smooth sine wave. Cheap inverters fake it with stepped “modified sine” output, which can make motors buzz, chargers run hot, and some medical devices refuse to work. Every unit in this index outputs a true pure sine wave, which is the minimum I'd accept.
How big a power station do I need?
Add up the watts of what you'll run at the same time. That's your output number. Then multiply each device's watts by the hours you'll run it and add those up. That's your capacity in watt-hours. Leave 15–20% headroom for inverter losses. Or just take the quiz.
Why is every unit LFP?
Lithium iron phosphate (LFP) batteries last 3,000–6,000 cycles versus roughly 500–1,000 for older NMC packs, and they're much more thermally stable. Every major brand has moved its lineup to LFP, so the index only tracks LFP units.
Do brands pay to be here?
No. No brand can pay for placement or a score. If a brand sends me a unit to review, I'll say so right on that unit's page.
07For brands
Want your unit on the index?
If you make a portable power station, inverter, or solar panel and want it compared honestly, send it over. Here's what you get:
- A full listing in the index, scored with the same formula as everyone else.
- Real-world notes from me added to your unit's page: runtime, noise, heat, and how it actually carries.
- Clear disclosure that the unit was provided for review. Honest coverage, good or bad.
- Corrections handled fast. If a spec here is wrong, tell me and I'll fix it.