EcoFlow Delta 3 Plus vs Anker SOLIX C1000 Gen 2

Both hold 1,024 Wh of LiFePO4, last 4,000 cycles, switch over in about 10 ms and carry a 5-year warranty. The differences are in growth, solar and output.

• Choose the EcoFlow Delta 3 Plus if you may want more capacity later (it expands to 5 kWh), plan to charge from a lot of solar (1,000 W) or want six AC outlets.
• Choose the Anker SOLIX C1000 Gen 2 if you want more output (2,000 W), the lightest unit (24.9 lb) and the quietest rating, and 1 kWh will always be enough.

• Same: capacity, chemistry, cycle life (4,000 to 80%), warranty (5 years), 140 W USB-C.
• Delta 3 Plus wins: solar input, expansion, AC outlets (6 vs 5), surge (3,600 W vs 3,000 W).
• C1000 Gen 2 wins: continuous output, weight, top wall-charging speed.

Not sure which number matters for you? Watts vs watt-hours explains it.

The C1000 Gen 2 takes up to 1,600 W in UltraFast mode for a full charge in about 49 minutes. UltraFast has to be switched on in the Anker app; normal charging is 1,200 W.

The Delta 3 Plus takes 1,500 W for a full charge in about 56 minutes, with no setting to change. It also accepts 800 W from EcoFlow's alternator charger and can pair with EcoFlow's Smart Generator.

In practice the gap is about 7 minutes. Either will refill during a short window of grid or generator power.

The Delta 3 Plus accepts 1,000 W of solar across two 500 W inputs (11–60 V each), for a full charge in about 70 minutes with enough panels. The C1000 Gen 2 takes 600 W (11–60 V) and fills in about 1.8 hours.

If you plan to run off-grid for days, the Delta 3 Plus gets more out of short sunny spells. See what size solar panel you need for either.

The C1000 Gen 2 delivers 2,000 W continuous (3,000 W surge) across 5 AC outlets. That covers most single kitchen appliances with headroom.

The Delta 3 Plus delivers 1,800 W continuous (3,600 W surge) across 6 AC outlets. Its X-Boost runs some simple heating appliances, like kettles, at up to 2,200 W by lowering their power. That isn't extra continuous output.

Neither runs a microwave and a coffee maker together, or a 240 V appliance.

Estimated runtimes on either station

• CPAP, no humidifier, DC cord27 h
• CPAP with humidifier, AC11 h
• Fridge + Wi-Fi router11 h

With the same 1,024 Wh, runtime won't decide this. A fridge and router through the night is realistic on either. Try your own devices in the runtime calculator.

The Delta 3 Plus grows from 1 kWh to 5 kWh with EcoFlow extra batteries. That turns it from a weekend station into real multi-day home backup.

The C1000 Gen 2 can't add batteries. What you buy is what you get. For more capacity in the Anker range you'd need a bigger model.

Both switch to battery in about 10 ms (EcoFlow: 10 ms; Anker: under 10 ms), fast enough for most computers, routers and CPAP machines.

Anker rates the C1000 Gen 2 at 20 dB, without stating the conditions. EcoFlow rates the Delta 3 Plus at 30 dB below 600 W. Both get louder when charging fast or under heavy loads.

Both apps (Wi-Fi and Bluetooth) let you monitor output, change charge settings and use a Time-of-Use mode.

• Battery life: both are rated for 4,000 cycles to 80% capacity. See LiFePO4 vs lithium-ion.
• Warranty: 5 years on both.
• Weight: the C1000 Gen 2 is 24.9 lb; the Delta 3 Plus is 27.6 lb, 2.7 lb heavier.

Best for home backup that may grow

EcoFlow Delta 3 Plus

Pick it for home backup, off-grid cabins or anyone likely to want more than 1 kWh later.

Pros

• Expands to 5 kWh
• 1,000 W solar input
• 6 AC outlets

Cons

• 1,800 W continuous
• 2.7 lb heavier

Check price on AmazonRead our full review

Best for more output in a lighter box

Anker SOLIX C1000 Gen 2

Pick it for camping, RV trips, apartments and CPAP use where 1 kWh is enough.

Pros

• 2,000 W continuous
• 24.9 lb
• Rated 20 dB

Cons

• Not expandable
• 600 W solar input

Check price on AmazonRead our full review

• Home backup: Delta 3 Plus, for the room to grow.
• Camping and RV: C1000 Gen 2, lighter with more output; the Delta 3 Plus if you rely on solar.
• CPAP: either; the C1000 Gen 2's lower noise rating suits a bedroom.

Which is better, the Delta 3 Plus or the C1000 Gen 2?

Neither overall. The Delta 3 Plus wins on expansion and solar; the C1000 Gen 2 wins on output and weight.

Can either be expanded?

Only the Delta 3 Plus, up to 5 kWh with EcoFlow extra batteries. The C1000 Gen 2 can't add batteries.

Which charges faster?

The C1000 Gen 2, at about 49 minutes with UltraFast on, against 56 minutes for the Delta 3 Plus. From solar, the Delta 3 Plus is faster.

Which is quieter?

Anker rates the C1000 Gen 2 at 20 dB; EcoFlow rates the Delta 3 Plus at 30 dB below 600 W.

Is the C1000 Gen 2 different from the original C1000?

Yes. Gen 2 is a newer model with its own specs, so check that any comparison you read uses the Gen 2 figures on this page.