Short answer: Anker SOLIX wins on inverter size and weight, EcoFlow wins on solar input and expansion at the small sizes. At 1 kWh the Anker SOLIX C1000 Gen 2 (about $500) runs 2,000 W and weighs 24.9 lb, while the EcoFlow DELTA 3 Plus ($500 to $1,000) takes 1,000 W of solar and grows to 5 kWh. For whole-home 240V backup, the Anker SOLIX F3800 Plus gives 6,000 W against 4,000 W on the EcoFlow DELTA Pro 3 and expands to 26.9 kWh, while the DELTA Pro 3 is 23.5 lb lighter with a 10 ms UPS.
Our picks at a glance
From published specs and our sizing rules. Not lab tested.
- 1
Best 1 kWh for power
Anker SOLIX C1000 Gen 2
1,024 Wh battery
Check price at Anker SOLIXPaid link
- 2
Best 1 kWh for solar and expansion
EcoFlow DELTA 3 Plus
1,024 Wh battery
Check price on AmazonPaid link
- 3
Best whole-home 240V
Anker SOLIX F3800 Plus
3,840 Wh battery
Check price at Anker SOLIXPaid link
Every unit compared here uses LiFePO4 cells and a pure sine wave inverter. Runtimes below use the site formula: capacity x 0.85 for inverter losses, divided by the average draw. A full-size fridge averages about 52 W, so a 1,024 Wh unit gives 1,024 x 0.85 = 870 Wh, and 870 / 52 = about 17 hours of fridge.
Tick your own appliances in the runtime table below to rank every unit in this guide by hours. To size a battery to your whole outage list, use the power station sizer.
Top picks, and why
Anker SOLIX C1000 Gen 2
- 1.0 kWh
- 2,000 W continuous
1,024 Wh, 2,000 W continuous (3,000 W surge), 10 ms UPS and 600 W of solar input at 24.9 lb, about $500. The biggest inverter of the 1 kWh units here, about 17 hours of fridge. It does not expand.
- 2,000 W inverter, highest of the 1 kWh class
- 10 ms UPS switchover
- About 17 hours of a full-size fridge per charge
- Not expandable
- Four AC outlets, two fewer than the original C1000
About $500 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
EcoFlow DELTA 3 Plus
- 1.0 kWh
- expands to 5 kWh
- 1,800 W continuous
1,024 Wh, 1,800 W (3,600 W surge), six AC outlets, 10 ms UPS and 1,000 W of solar input, $500 to $1,000. Refills in about 1.4 hours of full sun and expands to 5 kWh with extra batteries.
- 1,000 W solar input, double the DELTA 3
- Expands to 5 kWh, about 2 days of fridge
- Six AC outlets and 10 ms UPS switchover
- 1,024 Wh base, about 17 hours of fridge before expansion
- Not split-phase, no 240V
$500 to $1,000, live price on Amazon
Check price on AmazonPaid link. We earn a commission at no cost to you.
Anker SOLIX F3800 Plus
- 3.8 kWh
- expands to 27 kWh
- 6,000 W continuous
- 120/240V
3,840 Wh, 6,000 W continuous, 9,000 W surge and 120/240V output, expandable to 26,880 Wh with up to six BP3800 batteries, about $2,400. Runs a 240V well pump and expands further than any EcoFlow unit here.
- 120/240V split phase, so it can run 240V loads like a well pump
- 9,000 W surge covers a 1/2 HP well pump start
- 3,200 W solar input, more than the original F3800 (2,400 W)
- 137 lb, plan to keep it in one place
- 20 ms switchover, slower than the 0 ms Jackery Explorer 5000 Plus
About $2,400 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
Will it run your stuff?
Tick what you need to keep running. Every pick below re-sorts by how long it lasts on one charge.
Average draw about 104 W, peak about 1,251 W when the biggest motor starts.
- Check price on Amazon
EcoFlow DELTA Pro 3
4,096 Wh, Over $2,000
about 34 hours
Paid link
- Check price at Anker SOLIX
Anker SOLIX F3800 Plus
3,840 Wh, About $2,400 at Anker SOLIX
about 32 hours
Paid link
- Check price at Anker SOLIX
Anker SOLIX F3800
3,840 Wh, About $1,980 at Anker SOLIX
about 32 hours
Paid link
- Check price at Anker SOLIX
Anker SOLIX C2000 Gen 2
2,048 Wh, About $900 at Anker SOLIX
about 17 hours
Paid link
- Check price on Amazon
EcoFlow DELTA 2 Max
2,048 Wh, $500 to $1,000
about 17 hours
Paid link
- Check price at Anker SOLIX
Anker SOLIX C1000
1,056 Wh, About $470 at Anker SOLIX
about 8.5 hours
Paid link
- Check price at Anker SOLIX
Anker SOLIX C1000 Gen 2
1,024 Wh, About $500 at Anker SOLIX
about 8.5 hours
Paid link
- Check price on Amazon
EcoFlow DELTA 3 Plus
1,024 Wh, $500 to $1,000
about 8.5 hours
Paid link
- Check price on Amazon
EcoFlow DELTA 3
1,024 Wh, $500 to $1,000
about 8.5 hours
Paid link
Runtime = capacity x 0.85 inverter efficiency / average draw, with fridges and freezers cycling on their compressors. Amazon links are paid links. Amazon prices change, so we show a range.
Compare every pick
Paid links: we earn a commission if you buy, at no cost to you. Amazon prices change often, so we show a range and link to the live price.
1 kWh: C1000 Gen 2 and C1000 vs DELTA 3 and DELTA 3 Plus
Anker SOLIX C1000 Gen 2: 1,024 Wh, 2,000 W (3,000 W surge), 4 AC outlets, 600 W solar, 10 ms UPS, 24.9 lb, not expandable, about $500. Anker SOLIX C1000 (original): 1,056 Wh, 1,800 W (2,400 W surge), 6 AC outlets, 600 W solar, 20 ms UPS, 28.4 lb, expands to 2,112 Wh with one BP1000, about $470.
EcoFlow DELTA 3: 1,024 Wh, 1,800 W (3,600 W surge), 6 AC outlets, 500 W solar, 10 ms UPS, 27.6 lb, $500 to $1,000. EcoFlow DELTA 3 Plus: the same box with 1,000 W of solar input, $500 to $1,000. Both expand, and EcoFlow lists up to 5 kWh with extra batteries.
Pick the C1000 Gen 2 if you want the most inverter in the lightest box: 2,000 W continuous handles a microwave, coffee maker or 1,500 W space heater with room to spare. Pick the DELTA 3 Plus if you will charge from panels or add batteries later. Its 1,000 W solar input refills 1,024 Wh in about 1.4 hours of full sun (1,024 / 750), against about 2.3 hours on the C1000 Gen 2 (1,024 / 450).
All four run a 52 W fridge about 17 hours and a 40 W CPAP (humidifier off) about 22 hours. One extra battery doubles the DELTA 3 or the original C1000 to about 33 to 35 hours of fridge. The C1000 Gen 2 cannot be doubled.
Anker SOLIX C1000 Gen 2
- 1.0 kWh
- 2,000 W continuous
2,000 W continuous and 24.9 lb, 2.7 lb lighter than the DELTA 3, with a 10 ms UPS. Buy it for outage backup charged from the wall when you will not add a battery.
- 2,000 W inverter, highest of the 1 kWh class
- 10 ms UPS switchover
- About 17 hours of a full-size fridge per charge
- Not expandable
- Four AC outlets, two fewer than the original C1000
About $500 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
EcoFlow DELTA 3 Plus
- 1.0 kWh
- expands to 5 kWh
- 1,800 W continuous
1,000 W of solar, six AC outlets and expansion to 5 kWh. The pick for panels, van use or a backup system you will add to.
- 1,000 W solar input, double the DELTA 3
- Expands to 5 kWh, about 2 days of fridge
- Six AC outlets and 10 ms UPS switchover
- 1,024 Wh base, about 17 hours of fridge before expansion
- Not split-phase, no 240V
$500 to $1,000, live price on Amazon
Check price on AmazonPaid link. We earn a commission at no cost to you.
Anker SOLIX C1000
- 1.1 kWh
- expands to 2 kWh
- 1,800 W continuous
1,056 Wh with six AC outlets and one BP1000 doubling it to 2,112 Wh, about 34 hours of fridge. Slower 20 ms UPS and 2,400 W surge. about $470.
- Six AC outlets and an 1,800 W inverter
- About 17 hours of fridge, 29 with the expansion battery
- Expansion tops out at 2,112 Wh
- 20 ms switchover, slower than the C1000 Gen 2
About $470 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
EcoFlow DELTA 3
- 1.0 kWh
- expands to 5 kWh
- 1,800 W continuous
The DELTA 3 Plus with 500 W of solar input instead of 1,000 W, $500 to $1,000. Fine if you charge from the wall and want six outlets plus expansion.
- Six AC outlets and a 1,800 W inverter
- Expands to 5 kWh, about 2 days of fridge
- 10 ms UPS switchover
- 500 W solar input, half the DELTA 3 Plus
- Not split-phase, no 240V
$500 to $1,000, live price on Amazon
Check price on AmazonPaid link. We earn a commission at no cost to you.
2 kWh: C2000 Gen 2 vs DELTA 2 Max
Anker SOLIX C2000 Gen 2: 2,048 Wh, 2,400 W (4,000 W surge), 4 AC outlets plus a TT-30 RV outlet, 800 W solar, 10 ms UPS, 41.7 lb, expands to 4,096 Wh with one BP2000, about $900. EcoFlow DELTA 2 Max: 2,048 Wh, 2,400 W (4,800 W surge), 6 AC outlets, 1,000 W solar, 20 ms UPS, 50.7 lb, expands to 6,144 Wh with two extra batteries, $500 to $1,000.
Same battery, same continuous rating. The Anker is 9 lb lighter and switches to battery twice as fast (10 ms vs 20 ms), which matters for a desktop PC or network gear on UPS. The EcoFlow has more surge, two more outlets, 200 W more solar input and a higher expansion ceiling.
Each runs a 52 W fridge about 33 hours per charge (2,048 x 0.85 = 1,741 Wh, / 52). Expanded, the C2000 Gen 2 reaches about 67 hours and the DELTA 2 Max about 100 hours. Solar refill in full sun: about 3.4 hours for the Anker (2,048 / 600) and 2.7 hours for the EcoFlow (2,048 / 750).
Anker SOLIX C2000 Gen 2
- 2.0 kWh
- expands to 4 kWh
- 2,400 W continuous
2 kWh and 2,400 W at 41.7 lb, a 10 ms UPS and a TT-30 RV outlet, about $900. Doubles to 4,096 Wh with one BP2000.
- TT-30 RV outlet for a camper
- Expands to 4,096 Wh, about 2 days of fridge
- 10 ms UPS switchover
- Expansion tops out at 4 kWh
- Not split-phase, no 240V
About $900 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
EcoFlow DELTA 2 Max
- 2.0 kWh
- expands to 6 kWh
- 2,400 W continuous
4,800 W surge, six AC outlets, 1,000 W solar and expansion to 6,144 Wh, about 100 hours of fridge fully expanded. 50.7 lb with a 20 ms UPS.
- Expands to 6,144 Wh, about 3 days of fridge
- 2,400 W inverter and six AC outlets
- 1,000 W solar input
- Over 50 lb at 50.7 lb
- 20 ms switchover, slower than the DELTA 3 line
$500 to $1,000, live price on Amazon
Check price on AmazonPaid link. We earn a commission at no cost to you.
Whole-home 240V: F3800 Plus and F3800 vs DELTA Pro 3
Anker SOLIX F3800 Plus: 3,840 Wh, 6,000 W (9,000 W surge), 120/240V, 8 AC outlets, 3,200 W solar, 20 ms UPS, 137 lb, expands to 26,880 Wh with up to six BP3800 batteries, about $2,400. The original F3800 has the same battery, inverter and 240V output with 2,400 W of solar input and slower AC charging, about $1,980.
EcoFlow DELTA Pro 3: 4,096 Wh, 4,000 W (8,000 W surge), 120/240V, 2,600 W solar, 10 ms UPS, 113.5 lb, expands to about 12 kWh with two extra batteries, over $2,000.
The Anker has 50 percent more continuous output, which is the difference between running a well pump with the fridge, furnace and microwave on, or not. It also expands more than twice as far. The DELTA Pro 3 holds 256 Wh more in the base unit, weighs 23.5 lb less and has the faster UPS. A 52 W fridge runs about 63 hours on the F3800 Plus (3,840 x 0.85 = 3,264 Wh) and about 67 hours on the DELTA Pro 3 (3,482 Wh).
Expansion batteries: the Anker BP3800 adds 3,840 Wh (about $1,800) and the EcoFlow DELTA Pro 3 Extra Battery adds 4,096 Wh ($1,000 to $2,000). For automatic circuit switching, Anker sells the Smart Home Power Kit (about $1,200) and EcoFlow the Smart Home Panel 2 ($1,000 to $2,000). Either panel needs a licensed electrician.
Anker SOLIX F3800 Plus
- 3.8 kWh
- expands to 27 kWh
- 6,000 W continuous
- 120/240V
6,000 W at 120/240V, 9,000 W surge for a 1/2 HP well pump start, and up to 26,880 Wh. 3,200 W of solar refills it in about 1.6 hours of full sun.
- 120/240V split phase, so it can run 240V loads like a well pump
- 9,000 W surge covers a 1/2 HP well pump start
- 3,200 W solar input, more than the original F3800 (2,400 W)
- 137 lb, plan to keep it in one place
- 20 ms switchover, slower than the 0 ms Jackery Explorer 5000 Plus
About $2,400 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
EcoFlow DELTA Pro 3
- 4.1 kWh
- expands to 12 kWh
- 4,000 W continuous
- 120/240V
4,096 Wh and 4,000 W at 120/240V with a 10 ms switchover, 113.5 lb. The better fit if your 240V loads stay under 4,000 W together.
- 120/240V split-phase output
- Home panel compatible
- 2,600 W solar input, highest in our list
- Over 100 lb at 113.5 lb
Over $2,000, live price on Amazon
Check price on AmazonPaid link. We earn a commission at no cost to you.
Anker SOLIX F3800
- 3.8 kWh
- expands to 27 kWh
- 6,000 W continuous
- 120/240V
The F3800 Plus inverter and battery with 2,400 W of solar input instead of 3,200 W, about $1,980. Worth it only when it sells well below the Plus.
- 120/240V output for a well pump or dryer
- 6,000 W inverter, highest in our list
- Expands to 26,880 Wh, largest in our list
- Heaviest unit in our list at 132.3 lb
- 20 ms switchover, slower than the DELTA Pro 3
About $1,980 at Anker SOLIX, checked Oct 13, 2026
Check price at Anker SOLIXPaid link. We earn a commission at no cost to you.
How to choose between the brands
If you charge from the wall and want the most output per pound, Anker wins at 1 kWh and 2 kWh. If you will charge from solar or plan to add batteries, EcoFlow wins at those sizes. For a whole home on 240V, the deciding number is continuous watts: add up what must run at once, and if it is over 4,000 W, only the Anker covers it.
Warranty terms change by model and by store. Compare the current terms on the Anker SOLIX and EcoFlow product pages before you order.
The bottom line
From published specs and our sizing rules. Not lab tested.
- 1
Best 1 kWh for power
Anker SOLIX C1000 Gen 2
1,024 Wh battery
Check price at Anker SOLIXPaid link
- 2
Best 1 kWh for solar and expansion
EcoFlow DELTA 3 Plus
1,024 Wh battery
Check price on AmazonPaid link
- 3
Best whole-home 240V
Anker SOLIX F3800 Plus
3,840 Wh battery
Check price at Anker SOLIXPaid link
Frequently asked questions
Is Anker SOLIX better than EcoFlow?
It depends on the size. At 1 kWh the Anker C1000 Gen 2 has the bigger inverter (2,000 W vs 1,800 W) and weighs less, while the EcoFlow DELTA 3 Plus has double the solar input and expands to 5 kWh. At 2 kWh the Anker C2000 Gen 2 is 9 lb lighter with a faster UPS, and the DELTA 2 Max has more surge and expansion. For whole-home 240V, the Anker F3800 Plus has 6,000 W against 4,000 W on the DELTA Pro 3.
Anker SOLIX C1000 Gen 2 vs EcoFlow DELTA 3 Plus: which should I buy?
Buy the C1000 Gen 2 (about $500) for a 2,000 W inverter at 24.9 lb, charged from the wall. Buy the DELTA 3 Plus ($500 to $1,000) for 1,000 W of solar input, six AC outlets and expansion to 5 kWh. Both hold 1,024 Wh and have a 10 ms UPS.
Anker SOLIX C2000 Gen 2 vs EcoFlow DELTA 2 Max: which is better?
Both hold 2,048 Wh and run 2,400 W. The C2000 Gen 2 weighs 41.7 lb against 50.7 lb and has a 10 ms UPS against 20 ms. The DELTA 2 Max has 4,800 W surge vs 4,000 W, 1,000 W solar vs 800 W, six AC outlets and expands to 6,144 Wh vs 4,096 Wh.
Anker SOLIX F3800 Plus vs EcoFlow DELTA Pro 3: which is better for home backup?
The F3800 Plus for bigger homes: 6,000 W continuous at 120/240V and expansion to 26,880 Wh. The DELTA Pro 3 for lighter loads: 4,000 W, 4,096 Wh base, a 10 ms UPS and 113.5 lb against 137 lb. Both can run a 1/2 HP 240V well pump.
How long will an Anker SOLIX or EcoFlow run a refrigerator?
About 17 hours on a 1 kWh unit, 33 hours on a 2 kWh unit, 63 hours on the Anker F3800 Plus and 67 hours on the EcoFlow DELTA Pro 3, for a fridge averaging about 52 W. That is capacity x 0.85 / 52.
How long will an Anker SOLIX or EcoFlow run a CPAP?
About 22 hours on a 1,024 Wh unit (C1000 Gen 2, DELTA 3, DELTA 3 Plus) and 43 to 44 hours on a 2,048 Wh unit (C2000 Gen 2, DELTA 2 Max), for a 40 W CPAP with the humidifier off. A heated humidifier raises the draw and cuts those hours.
Which charges faster from solar, Anker SOLIX or EcoFlow?
EcoFlow at 1 kWh and 2 kWh, Anker at the whole-home size. Using Wh / (solar input x 0.75), the DELTA 3 Plus refills in about 1.4 hours of full sun against 2.3 hours for the C1000 Gen 2, and the DELTA 2 Max in 2.7 hours against 3.4 for the C2000 Gen 2. The F3800 Plus (3,200 W) takes about 1.6 hours and the DELTA Pro 3 (2,600 W) about 2.1.
Which has a faster UPS switchover, Anker or EcoFlow?
At 1 kWh both have 10 ms on the current models. At 2 kWh the Anker C2000 Gen 2 is 10 ms and the DELTA 2 Max 20 ms. At the whole-home size it flips: the DELTA Pro 3 is 10 ms and the Anker F3800 and F3800 Plus are 20 ms.
Can an Anker SOLIX or EcoFlow run a well pump?
A 240V well pump needs a split-phase unit: the Anker F3800 or F3800 Plus, or the EcoFlow DELTA Pro 3. Their 9,000 W and 8,000 W surge ratings cover a 1/2 HP pump start. The 1 kWh and 2 kWh units are 120V only.
12 products are linked on this page. We have not lab-tested these products; picks are based on published specifications and our sizing rules. Amazon prices change, so we show a range and link to the live price. See our disclosure.
Size it for your home
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Marcus Reed
Founder and Editor, CrunchYourDollars
Marcus Reed builds the sizing tools on CrunchYourDollars. He is a software engineer with a long-running PC hardware and power supply habit, which is where the watts, watt-hours and surge math on this site comes from. Product specs are pulled from manufacturer data sheets, electricity rates from the U.S. Energy Information Administration, and water chemistry rules from the Water Quality Association. He is not a licensed electrician or plumber: the tools show the math and the matching models so you can make the call, and anything involving your electrical panel should be checked by a licensed pro.
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