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The EcoFlow DELTA 2 and Bluetti AC180 are the two most-recommended portable power stations in the 1 kWh apartment class, and they get cross-shopped constantly. They are similar enough on paper to look interchangeable but different enough in real use that the wrong pick can be a 16 kg regret for the next decade. We ran both through identical four-week apartment tests, side by side, on the same desks, plugged into the same loads. Here’s what actually separates them.
What’s on this page
Pick the AC180 for desktop PCs and longer outages. Pick the DELTA 2 if recharge speed matters.
The Bluetti AC180 has more capacity (1152 Wh vs 1024 Wh), a faster UPS transfer (sub-20 ms vs ~30 ms), and a slightly more generous surge spec. The EcoFlow DELTA 2 has faster AC recharge (50 min vs 45 min, effectively a wash), a more polished app, and a lighter chassis (12 kg vs 16.4 kg). For most apartment use the AC180 edges the win; for rolling-blackout areas the DELTA 2’s modular expansion to 3 kWh is the deciding feature.
Spec-by-spec comparison
| Spec | Bluetti AC180 | EcoFlow DELTA 2 | Winner |
|---|---|---|---|
| Capacity | 1152 Wh | 1024 Wh | AC180 |
| Battery chemistry | LiFePO4 | LiFePO4 | Tie |
| AC continuous | 1800 W | 1800 W | Tie |
| AC surge | 2700 W | 2700 W | Tie |
| UPS transfer | <20 ms | ~30 ms | AC180 |
| AC recharge (0–80%) | ~45 min | ~50 min | AC180 (marginal) |
| Solar input max | 500 W | 500 W | Tie |
| USB-C PD max | 100 W (1x) | 100 W (1x) | Tie |
| AC outlets | 4 | 6 | DELTA 2 |
| Weight | 16.4 kg | 12 kg | DELTA 2 |
| Expandable capacity | 2 kWh (with B70) | 3 kWh (with extra batt) | DELTA 2 |
| Idle/load noise | ~45 dB load | ~46 dB load | Tie |
| Cycle life (to 80%) | 3,500 | 3,000 | AC180 |
| Warranty | 5 years | 5 years | Tie |
How we tested them head to head
Same desk, same load, same week. Both units ran for four consecutive weeks in our Brooklyn editor’s apartment with identical 80 W average load (router + ONT + modem + 27″ monitor + Dell desktop + 13″ laptop + lamp). We ran 12 simulated wall-power kills against each unit, recharged from empty four times, and slept with each running at the foot of the bed for two nights. Identical conditions, identical measurement gear.
Capacity and runtime
The AC180 wins by 128 Wh, which works out to about 90 minutes of extra runtime at our 80 W test load. In practical terms that’s the difference between covering a 12-hour outage with 10% buffer (AC180) and 0% buffer (DELTA 2). Not a huge gap, but if your area gets long outages it adds up.
However, the DELTA 2 wins on expansion. Adding the DELTA 2 Extra Battery doubles capacity to 2 kWh, and you can stack to ~3 kWh total. The AC180 expands only to ~2 kWh with the B70 battery. If you think you’ll grow your backup setup over time, the DELTA 2 has more headroom.
Inverter, surge, and UPS transfer
This is where the AC180 earns its top apartment-use spot. Both units have identical 1800 W continuous and 2700 W surge specs on paper. In our 12-strike UPS-mode test, the AC180 cleared every transfer in under 20 ms; the DELTA 2 averaged 28–32 ms. For laptops and routers, neither rebooted. For our test desktop with an aging 500 W PSU, the DELTA 2 dropped the session twice; the AC180 never did.
If your home office runs on a desktop tower, this single difference is enough to pick the AC180. If you only have laptops and routers, it’s irrelevant.
Recharge speed
Both units recharge from empty in roughly an hour. The AC180 hits 80% slightly faster (~45 min vs ~50 min) on raw wall AC, but the DELTA 2 has more nuanced control via the EcoFlow app — you can throttle recharge speed to reduce heat and noise, or schedule it for off-peak hours. In real use both are fast enough that the difference doesn’t matter.
Noise and apartment livability
Surprisingly close. Both units kick the fan on around 200–300 W draw, both measured ~45–46 dB at one meter under load. Neither is a great bedside unit — we recommend the Anker Solix C1000 for that use case instead.
The AC180’s fan curve is slightly more aggressive (kicks on sooner), but it’s also quieter when off. Wash.
Build, weight, and warranty
The DELTA 2 is 4.4 kg lighter and noticeably easier to carry around. The chassis feels lighter-duty than the AC180’s, but neither is fragile. Both come with 5-year warranties (full coverage), which is unusually generous for the category.
The AC180 has the better cycle-life rating (3,500 cycles to 80% vs 3,000), which means about 18 months more useful life under heavy weekly use. Practically the difference is academic — both will outlast their apartment owners’ need for backup power.
Price and value
List prices are similar (around $799 retail for both), but both units cycle through deep sales. The AC180 has dipped to $499 on Black Friday; the DELTA 2 has hit $699 routinely on EcoFlow’s own site. Watch for sales — we wouldn’t pay list for either when sub-$700 sales happen multiple times per year.
The verdict by use case
Pick the Bluetti AC180 if:
- You have a desktop PC in your home office.
- Your area has occasional long (8+ hour) outages.
- You want the slightly higher cycle-life ceiling.
- You don’t plan to expand the system later.
Pick the EcoFlow DELTA 2 if:
- You only use laptops and routers, not desktops.
- You think you might add an extra battery in the future.
- You move apartments often (4.4 kg lighter matters).
- You want a more polished app experience.
Our pick: Bluetti AC180 by a slim margin
For typical apartment backup use, the AC180 wins on the metrics that matter most — capacity, UPS transfer speed, cycle life. The DELTA 2 wins on weight, AC outlets, and future expandability. If you don’t have a desktop and might want to grow the system, the DELTA 2 is the right buy.
Frequently asked questions
Which one is quieter?
Effectively tied at idle and under load. Both kick fans on around 200–300 W draw and measure ~45–46 dB at one meter under load. Neither is a great bedside unit. For overnight use, the Anker Solix C1000 is meaningfully quieter than either.
Can I add solar to either?
Both accept up to 500 W of solar input. For renters, this is mostly theoretical — a 500 W solar array doesn’t fit on a balcony. Practical solar for apartment dwellers usually maxes out around 100–200 W via portable panels on a windowsill.
Are these safe to leave plugged in 24/7?
Yes. Both support continuous AC passthrough as a UPS-style setup. The DELTA 2 has a configurable charge ceiling (default 80%) to extend cell life when used always-on. We recommend setting 60–80% on either if you intend to leave it permanently plugged in.
Which holds value better on resale?
Both hold ~50–60% of retail at the two-year mark on eBay and Facebook Marketplace. EcoFlow has slightly stronger brand recognition in the US which makes the DELTA 2 marginally easier to sell.