Best small unit
EcoFlowRIVER 3 Plus
Fridgestarts one on a 1,200 W surge
Outdoor Life drew 49–77% of the label out of the twelve units it tested on a 34 W overnight load. Size on that, then check the surge rating against your biggest appliance.
Filter all 33 by what you runBest small unit
Fridgestarts one on a 1,200 W surge
Best 1 kWh unit
Carry by hand2,000 W at 24.9 lb
Best 2 kWh unit
Low cost per Wh$0.32 per watt‑hour
Best home backup
Add‑on batteriesto 21 kWh, 7,200 W surge
By the Worth To Buy editorial team
Built fromOutdoor Life’s published capacity tests, marked † · maker spec pages · Amazon prices and ratings on the date shown
33 of 33 power stations match
Show themFrom maker spec pages and Amazon listing titles; † marks Outdoor Life’s measurements. No tag can simply mean we could not verify that figure (most gaps are on BLUETTI’s Elite 100 V2, AC180 and Elite 200 V2 and the ECO-WORTHY). Every unit here except the Jackery Explorer 300 (lithium-ion) is LiFePO4.
Phones, laptops, a camp light and, on the AC units, a 40 W CPAP for about 2 to 4½ hours. Only the RIVER 3 Plus publishes a surge rating high enough to start a fridge, and two of the nine, Anker’s C200 DC and C300 DC, have no AC outlet at all.
Fridgestarts one on a 1,200 W surge
600 W continuous, a 1,200 W surge and a 10 ms UPS switchover in a 10.4 lb box: the only small unit here with a published surge rating high enough to start a fridge.
The catch 286 Wh: a 40 W CPAP runs about 4.4 hours on it, half a night.
Buy it if: You want a small unit that keeps a router or modem on through a short outage and can start a small appliance.
Specs: ecoflow.com spec sheet; Amazon listing title.
4.6(11,314)8000+ bought in past month
Carry by hand7.1 lb, two AC outlets
The catch Lithium-ion, not LiFePO4: 800 cycles to 80% capacity, and 4.5 hours to recharge from the wall.
Buy it if: You want two AC outlets in about 7 lb for phones, laptops and a camera, and price matters more than cycle life.
Specs: jackery.com spec table and manual.
4.5(1,212)4000+ bought in past month
Carry by hand600 W at 9.48 lb
The catch No surge rating: its 1,500 W “lifting power” is for pure resistive devices, not motors.
Buy it if: You want 600 W in the small size and don’t need an add-on battery.
Specs: bluettipower.com spec table; Amazon listing title (288Wh 600W LFP).
4.3(1,280)1000+ bought in past month
UPS switchover10 ms, 3.97 lb
The catch 128 Wh and one 200 W outlet: phones, a laptop and a light, not a CPAP night.
Buy it if: You want something that fits in a bag for phones, a laptop and a camp light.
Specs: bluettipower.com spec table and manual.
1000+ bought in past month
Carry by hand6.4 lb, 300 W AC
The catch One AC outlet, and it shuts off at about 340 W: keep the load under 300 W.
Buy it if: You want the cheapest unit here with 300 W of AC output, for phones, a laptop and a light.
Specs: allweipower.com (ALLWEI’s US store) product page, FAQ and product images.
4.6(1,939)900+ bought in past month
UPS switchover10 ms, two 140 W USB‑C
The catch Same 300 W ceiling as the Jackery Explorer 300.
Buy it if: You run mostly USB-C gear and would rather skip the inverter.
Specs: ankersolix.com spec table; Amazon listing title.
Full in an hour50 min on AC
The catch 350 W continuous and a 600 W surge: no fridge, no kettle.
Buy it if: You already own Goal Zero panels or accessories.
Specs: goalzero.com product page.
4.5(1,769)1000+ bought in past month
USB‑C & DC only6.17 lb, car socket
The catch No AC outlet: USB-C, USB-A and a car socket only.
Buy it if: Your gear charges over USB-C or a 12 V socket and you would rather not carry an inverter.
Specs: ankersolix.com product page and manual.
4.4(1,041)500+ bought in past month
USB‑C & DC only4.2 lb, 140 W
The catch No AC outlet: USB-C and USB-A only.
Buy it if: You only run USB-C gear and want a 4.2 lb box with no inverter.
Specs: ankersolix.com product page and manual.
A weekend away or a day without power: fridge, router, lights, a CPAP every night. All nine start a fridge; the units over 1,000 Wh run it about 6 hours, the 677 Wh Yeti 700 about 4.
4.7(1,690)2000+ bought in past month
Carry by hand2,000 W at 24.9 lb
2,000 W continuous from a 24.9 lb box, full in 49 minutes, with a 10 ms UPS switchover: the most output per pound in the 1 kWh group.
The catch No add-on batteries: Anker dropped expansion on the Gen 2 to save weight.
Buy it if: Your loads are big and short (a fridge, a microwave, tools) and you want the most output you can carry.
Specs: ankersolix.com (spec table; FAQ: no expansion on the Gen 2); Amazon listing title.
4.7(3,698)2000+ bought in past month
Full in an hour60 min on AC
The catch 1,500 W continuous, below the other units over 1,000 Wh in its group, and no independent capacity test.
Buy it if: You want a light 1 kWh unit and your loads stay at 1,500 W or less.
Specs: jackery.com (checked September 2026); Amazon listing title.
4.5(1,820)2000+ bought in past month
Fridge3,600 W surge
The catch Cycles, weight and recharge time not verified.
Buy it if: You prefer BLUETTI; the DELTA 3 Classic lists the same output at about the same price with a fuller spec sheet.
Specs: bluetti.com; Amazon listing title (1024Wh 1800W / 3600W surge).
4.5(2,823)1000+ bought in past month
Microwave or heater1,800 W continuous
The catch 54% usable at 34 W, and 37 lb.
Buy it if: Your loads are big and short, and you want 1,152 Wh for the price on the card.
Outdoor Life measured 620 Wh (54%) at 34 W and 980 Wh (85%) at 380 W.
Specs: Amazon listing title; Outdoor Life weight and low-draw result.
4.7(1,337)1000+ bought in past month
Low cost per Wh$0.49, 3,600 W surge
The catch No add-on batteries, no 12 V car socket, and EcoFlow publishes no cycle rating.
Buy it if: You want the DELTA 3’s 1,800 W inverter for $130 less and won’t add batteries.
Specs: ecoflow.com/us spec table and US manual.
4.7(1,371)1000+ bought in past month
Fridge3,600 W surge, under 10 ms UPS
The catch 500 W solar input, half the DELTA 3 Plus’s.
Buy it if: You want the DELTA 3 Plus’s battery and add-on batteries for $90 less, and 500 W of solar is enough.
Specs: us.ecoflow.com product page, US manual and warranty policy.
4.7(2,152)700+ bought in past month
Add‑on batteriesto 2.1 kWh, unlike Gen 2
The catch The previous generation: 28.4 lb and 1,800 W, against 24.9 lb and 2,000 W for the Gen 2.
Buy it if: You want a 1 kWh Anker you can add a battery to, and don’t mind 3.5 lb more than the Gen 2.
Outdoor Life measured 650 Wh (62%) at 34 W and 950 Wh (90%) at 380 W.
Specs: ankersolix.com product page and FAQ.
4.7(717)400+ bought in past month
Add‑on batteriesup to 5 kWh
The catch 27.6 lb, 2.7 lb heavier than the Anker C1000 Gen 2, which has more output.
Buy it if: You want the DELTA 3 with twice the solar input (1,000 W), for $90 more.
Specs: ecoflow.com spec sheet; Amazon listing.
CPAP all night70% usable at 34 W†
The catch 600 W continuous: no microwave, kettle or space heater.
Buy it if: You run small loads such as a CPAP for a long time, and nothing over 600 W.
Outdoor Life measured 480 Wh (70%) at 34 W and 560 Wh (83%) at 380 W.
Specs: goalzero.com product page; Outdoor Life weight/recharge.
A fridge for 9 to 12 hours and a 40 W CPAP for three to four nights. All seven start a fridge; two take add-on batteries, and the BLUETTI FridgePower is built to back up one fridge.
4.7(393)2000+ bought in past month
Low cost per Wh$0.32 per watt‑hour
2,010 Wh at $0.32 per watt-hour, the lowest of any portable unit we could price, in a 35.7 lb box with a 10 ms UPS switchover. The inverter is 1,500 W.
The catch 1,500 W continuous: a big battery with a small inverter.
Buy it if: You want 2 kWh of runtime at the lowest cost per Wh of the portable units here, and your loads stay at 1,500 W or less.
Specs: ankersolix.com comparison table and notes; Amazon listing title (2,010Wh).
4.7(638)1000+ bought in past month
Fridge4,800 W surge, under 10 ms UPS
The catch No add-on batteries, and EcoFlow publishes no cycle rating.
Buy it if: You want 2 kWh with a 2,400 W inverter for less per Wh than every 2 kWh unit here except the S2000.
Specs: us.ecoflow.com product page and US manual.
4.7(714)1000+ bought in past month
Add‑on batteriesto 4.1 kWh, TT‑30 outlet
The catch 41.7 lb, and one add-on battery is the limit (4.1 kWh).
Buy it if: You want 2 kWh with enough output for a microwave or a heater, and a TT-30 plug for a camper.
Specs: ankersolix.com product page and manual.
4.4(890)900+ bought in past month
Low cost per Wh$0.44 at 39.5 lb
The catch No add-on batteries and no 240 V.
Buy it if: You want a 2 kWh unit two people can lift into a car, and won’t add batteries later.
Specs: jackery.com spec table, FAQ and manual.
4.4(57)500+ bought in past month
Fridgesits behind it, 10 ms switchover
The catch Two AC outlets and no USB: it is built to back up one appliance, not to go camping.
Buy it if: You want a fridge or freezer to ride through outages without anyone moving a plug.
Specs: bluettipower.com product page, FAQ and manual.
4.7(942)400+ bought in past month
Microwave or heater2,600 W continuous
The catch Cycles, weight and expansion not verified.
Buy it if: You want more than 1,500 W in a 2 kWh unit and don’t need 240 V.
Specs: bluetti.com; Amazon listing title (2073.6Wh 2600W).
Microwave or heater2,000 W continuous
The catch Goal Zero’s $1,499.95 list price is more than twice the Anker S2000’s Amazon price, for less capacity.
Buy it if: You already own Goal Zero gear.
Specs: goalzero.com product page.
Multi-day outages, well pumps, 240 V loads. These hold 2.8 to 5.1 kWh, a fridge for 16 to 30 hours. The Apex 300, DELTA Pro 3 and F3800 Plus list 240 V from one unit; the HomePower 3600 Plus needs a second, and the ECO-WORTHY is a wired-in battery, not a portable one.
4.6(208)800+ bought in past month
Add‑on batteriesto 21 kWh, 7,200 W surge
3,584 Wh, a 7,200 W surge and add-on batteries to 21 kWh, at $0.53 per watt-hour: the lowest per Wh of the expandable units here with a published surge rating. One unit gives 120 V; 240 V takes a second.
The catch One unit gives 120 V only: 240 V needs a second 3600 Plus and Jackery’s connector.
Buy it if: You want whole-home-style backup that starts at 3.6 kWh and grows with batteries, and can live with 120 V.
Specs: jackery.com product page and manual.
4.7(251)1000+ bought in past month
Microwave or heater2,400 W, TT‑30 outlet
The catch No add-on batteries: 3 kWh is all it will ever hold.
Buy it if: You want 3 kWh for an RV or a long outage in one box under 60 lb, and won’t add batteries.
Specs: bluettipower.com spec table, FAQ and manual.
4.6(165)400+ bought in past month
UPS switchoverunder 10 ms, TT‑30 outlet
The catch No add-on batteries, and EcoFlow publishes no cycle rating.
Buy it if: You want 3 kWh with a 3,600 W inverter and a TT-30 plug, and won’t add batteries.
Specs: us.ecoflow.com product page and FAQ (weight 32.7 kg, converted).
4.5(246)300+ bought in past month
Low cost per Wh$0.44, 7,200 W surge
The catch No add-on batteries and no 240 V.
Buy it if: You want 3 kWh and a 3,600 W inverter for less per Wh than the other portable units this size, and won’t add batteries.
Specs: jackery.com spec table, FAQ and manual.
4.3(167)200+ bought in past month
Add‑on batteries58 kWh across three units
The catch 83.8 lb, and no surge rating from BLUETTI.
Buy it if: You want DELTA Pro 3-class output and 240 V, and plan to add BLUETTI batteries.
Specs: bluettipower.com spec table; Amazon listing title (2764.8Wh 3840W).
4.5(63)100+ bought in past month
Low cost per Wh$0.31, not portable
The catch Not portable: a stationary 48 V battery that needs wiring.
Buy it if: You are wiring backup into the house and only care about capacity and price.
Specs: Amazon listing title (5120Wh LiFePO4, AC 5000W inverter).
4.3(135)100+ bought in past month
240 V appliances120/240 V from one unit
The catch 136.7 lb on wheels, the heaviest published weight on the page.
Buy it if: You need 240 V from one box today and plan to grow past 10 kWh.
Specs: ankersolix.com product page, manual and support FAQ.
4.3(717)100+ bought in past month
240 V appliancessplit‑phase from one unit
The catch The highest Amazon price on the page.
Buy it if: You need 240 V today, or you are wiring it in with a transfer switch.
Specs: us.ecoflow.com spec table; Amazon listing title.
| Model | Cont. W | Surge W | Label Wh | Weight lb | AC to full | Amazon | |
|---|---|---|---|---|---|---|---|
| Up to 300 Wh | |||||||
| 600 | 1,200 | 286 | 10.4 | 60 min | — | Amazon → | |
| 300 | 500 | 293.8 | 7.1 | 270 min | $259.00★ 4.6 · 11,314 | Amazon → | |
| 600 | — | 288 | 9.48 | 45 min to 80% | $289.99★ 4.5 · 1,212 | Amazon → | |
| 200 | 300 | 128 | 3.97 | 70 min | $119.00★ 4.3 · 1,280 | Amazon → | |
| 300 | 600 | 256 | 6.4 | 240 min | $159.00 | Amazon → | |
| 300 | 600 | 288 | 9.1 | 50 min to 80% | $329.99★ 4.6 · 1,939 | Amazon → | |
| 350 | 600 | 297 | 13.7 | 50 min | — | Maker → | |
| DC only | — | 288 | 6.17 | no AC input | $199.99★ 4.5 · 1,769 | Amazon → | |
| DC only | — | 192 | 4.2 | no AC input | $169.99★ 4.4 · 1,041 | Amazon → | |
| 600 Wh–1.2 kWh | |||||||
| Model | Cont. W | Surge W | Label Wh | Weight lb | AC to full | Amazon | |
| 2,000 | 3,000 | 1,024 | 24.9 | 49 min | $699.99★ 4.7 · 1,690 | Amazon → | |
| 1,500 | 3,000 | 1,070 | 23.8 | 60 min | $499.00★ 4.7 · 3,698 | Amazon → | |
| 1,800 | 3,600 | 1,024 | — | — | $499.00★ 4.5 · 1,820 | Amazon → | |
| 1,800 | — | 1,152 | 37 | — | $449.00★ 4.5 · 2,823 | Amazon → | |
| 1,800 | 3,600 | 1,024 | 26.6 | 60 min | $498.99★ 4.7 · 1,337 | Amazon → | |
| 1,800 | 3,600 | 1,024 | 27.6 | 56 min | $629.00★ 4.7 · 1,371 | Amazon → | |
| 1,800 | — | 1,056 | 28.44 | 58 min | $499.99★ 4.7 · 2,152 | Amazon → | |
| 1,800 | 3,600 | 1,024 | 27.6 | 56 min | $719.00★ 4.7 · 717 | Amazon → | |
| 600 | 1,000 | 677 | 20.9 | 118 min | — | Maker → | |
| 1.5–2.1 kWh | |||||||
| Model | Cont. W | Surge W | Label Wh | Weight lb | AC to full | Amazon | |
| 1,500 | 3,000 | 2,010 | 35.7 | 138 min | $649.98★ 4.7 · 393 | Amazon → | |
| 2,400 | 4,800 | 2,048 | 44.8 | 68 min to 80% | $879.00★ 4.7 · 638 | Amazon → | |
| 2,400 | 4,000 | 2,048 | 41.7 | 88 min | $899.98★ 4.7 · 714 | Amazon → | |
| 2,200 | 4,400 | 2,042 | 39.5 | 105 min | $899.00★ 4.4 · 890 | Amazon → | |
| 1,800 | 3,600 | 2,016 | 43.43 | 105 min | $949.00★ 4.4 · 57 | Amazon → | |
| 2,600 | — | 2,074 | — | — | $1,399.00★ 4.7 · 942 | Amazon → | |
| 2,000 | 3,600 | 1,505 | 52.75 | 66 min | — | Maker → | |
| 2.7 kWh and up | |||||||
| Model | Cont. W | Surge W | Label Wh | Weight lb | AC to full | Amazon | |
| 3,600 | 7,200 | 3,584 | 77.16 | 150 min | $1,899.00★ 4.6 · 208 | Amazon → | |
| 2,400 | — | 3,014.4 | 57.98 | 120 min | $1,499.00★ 4.7 · 251 | Amazon → | |
| 3,600 | 7,200 | 3,072 | 72.1 | 120 min | $1,349.00★ 4.6 · 165 | Amazon → | |
| 3,600 | 7,200 | 3,072 | 59.52 | 132 min | $1,349.00★ 4.5 · 246 | Amazon → | |
| 3,840 | — | 2,765 | 83.8 | 65 min | $1,498.98★ 4.3 · 167 | Amazon → | |
| 5,000 | — | 5,120 | — | — | $1,589.99★ 4.5 · 63 | Amazon → | |
| 6,000 | — | 3,840 | 136.7 | — | $2,599.99★ 4.3 · 135 | Amazon → | |
| 4,000 | 8,000 | 4,096 | 113.5 | — | $2,799.00★ 4.3 · 717 | Amazon → | |
Highlighted = highest continuous output in its size. Continuous W must be at least what you run; surge W at least what it takes to start. Dashes are figures we could not verify. The cards’ overnight usable Wh is label Wh × 62% unless marked † (Outdoor Life’s measurement).
| Model | Cycles, to % capacity | Solar in W | Expandable | UPS | 240 V | Source |
|---|---|---|---|---|---|---|
| Up to 300 Wh | ||||||
| 3,000 to 80% | 220 | to 858 Wh | 10 ms | — | ecoflow.com spec sheet; Amazon listing title | |
| 800 to 80% | — | — | — | — | jackery.com spec table and manual | |
| 3,000 to 80% | 200 | — | 10 ms | — | bluettipower.com spec table; Amazon listing title (288Wh 600W LFP) | |
| 3,000 to 80% | 100 | — | 10 ms or less | — | bluettipower.com spec table and manual | |
| 3,000 (end point not stated) | — | — | — | — | allweipower.com (ALLWEI’s US store) product page, FAQ and product images | |
| 3,000 to 80% | 100 | — | 10 ms | — | ankersolix.com spec table; Amazon listing title | |
| 4,000 to 80% | 200 | — | — | — | goalzero.com product page | |
| — | 100 | — | — | — | ankersolix.com product page and manual | |
| — | 100 | — | — | — | ankersolix.com product page and manual | |
| 600 Wh–1.2 kWh | ||||||
| Model | Cycles, to % capacity | Solar in W | Expandable | UPS | 240 V | Source |
| 4,000 to 80% | 600 | — | 10 ms | — | ankersolix.com (spec table; FAQ: no expansion on the Gen 2); Amazon listing title | |
| 4,000 to 70% | 400 | — | — | — | jackery.com (checked September 2026); Amazon listing title | |
| — | — | — | — | — | bluetti.com; Amazon listing title (1024Wh 1800W / 3600W surge) | |
| — | — | — | — | — | Amazon listing title; Outdoor Life weight and low-draw result | |
| — | 500 | — | 10 ms | — | ecoflow.com/us spec table and US manual | |
| 4,000 to 80% | 500 | to 5 kWh | under 10 ms | — | us.ecoflow.com product page, US manual and warranty policy | |
| 3,000 to 80% | 600 | to 2.1 kWh with one BP1000 battery | under 20 ms | — | ankersolix.com product page and FAQ | |
| 4,000 to 80% | 1,000 | to 5 kWh | 10 ms | — | ecoflow.com spec sheet; Amazon listing | |
| 4,000 to 80% | 200 | — | — | — | goalzero.com product page; Outdoor Life weight/recharge | |
| 1.5–2.1 kWh | ||||||
| Model | Cycles, to % capacity | Solar in W | Expandable | UPS | 240 V | Source |
| 6,000 to 80%; 10,000 to 60% | — | — | 10 ms | — | ankersolix.com comparison table and notes; Amazon listing title (2,010Wh) | |
| — | 500 | — | under 10 ms | — | us.ecoflow.com product page and US manual | |
| 4,000 to 80% | 800 | to 4.1 kWh with one BP2000 battery | 10 ms | — | ankersolix.com product page and manual | |
| 4,000 to 70% | 400 | — | under 20 ms | — | jackery.com spec table, FAQ and manual | |
| 4,000 to 80% | 1,000 | to 8.1 kWh with three BlueCell 200 batteries | 10 ms or less | — | bluettipower.com product page, FAQ and manual | |
| — | — | — | — | — | bluetti.com; Amazon listing title (2073.6Wh 2600W) | |
| 4,000 to 80% | 900 | — | — | — | goalzero.com product page | |
| 2.7 kWh and up | ||||||
| Model | Cycles, to % capacity | Solar in W | Expandable | UPS | 240 V | Source |
| 6,000 to 70% | 1,000 | to 21 kWh with five Battery Pack 3600 | under 10 ms | 240 V with a second unit | jackery.com product page and manual | |
| 6,000 to 80% | 1,200 | — | 10 ms or less | — | bluettipower.com spec table, FAQ and manual | |
| — | 800 | — | under 10 ms | — | us.ecoflow.com product page and FAQ (weight 32.7 kg, converted) | |
| 4,000 to 70% | 1,000 | — | under 20 ms | — | jackery.com spec table, FAQ and manual | |
| 6,000 to 80% | 2,400 | to 58 kWh across three units | 0 or 20 ms | 120/240 V from one unit | bluettipower.com spec table; Amazon listing title (2764.8Wh 3840W) | |
| — | — | — | — | — | Amazon listing title (5120Wh LiFePO4, AC 5000W inverter) | |
| 3,000 to 80% | 3,200 | to 26.9 kWh per unit with six BP3800 batteries | 20 ms | 120/240 V from one unit | ankersolix.com product page, manual and support FAQ | |
| 4,000 to 80% | 2,600 | to 12 kWh per unit, 36 kWh across three units | 10 ms | 120/240 V from one unit | us.ecoflow.com spec table; Amazon listing title | |
Cycles are each maker’s figure, to the remaining capacity shown: Jackery counts its LiFePO4 units to 70% (the lithium-ion Explorer 300 to 80%), the other makers here to 80%, and ALLWEI gives no end point, and Anker also quotes the S2000 to 60%. Compare cycle counts only at the same end point. Every unit here except the Jackery Explorer 300 (lithium-ion) is LiFePO4.
TakeawayOvernight you keep about half to three-quarters of the label. Best: Grecell T1000 77%, Lion Energy Summit 72%, Goal Zero Yeti 700 70%. Worst: Jackery Explorer 1000 Plus 49%, Vtoman FlashSpeed 1500 50%. At a 380 W load the eleven units run at that load held 78–92% (the Oupes’s first run: 76%). The gap is the inverter running itself: by the middle of these results, a 1,000 Wh label gives about 600 Wh overnight and about 870 Wh at 380 W.
Measured by Outdoor Life, published 9 January 2026: each unit ran a ~34 W grow light and, separately, a ~380 W dehumidifier until shutdown. Names are as Outdoor Life lists them; only the Yeti 700, the AC180 and the first-generation C1000 are the same models as on our list; its “Delta 3” may be our DELTA 3 or DELTA 3 Plus (see those cards). The Oupes ran the 380 W test twice (76%, then 92% after three months in storage), and the AC180’s review text gives 39.9% at 34 W where the results table gives 54%.
Arithmetic, not a claim: label Wh × 62% for loads under 100 W (× 87% above) ÷ the load, the middle of Outdoor Life’s measured results above. Appliance wattages are typical; read the plate on yours. “Won’t start” = continuous rating below the running load, or surge rating below the start-up peak.
TakeawayEvery class from 1 kWh up gets a CPAP through the night. The 300 Wh class gives about 4 hours. A full day of refrigerator is beyond every pick: the 2 kWh pick manages about half a day and the 3.6 kWh home-backup pick about 21 hours. A space heater runs about an hour on a 2 kWh unit and about two on the home-backup pick. → Anker SOLIX C1000 Gen 2 · check price
Motors draw several times their running wattage for a second at start-up.
Our four picks
Appliances (typical)
A unit’s surge rating covers the start-up peak for a second or two. Continuous W must be at least what you run; surge W at least what it takes to start. Typical values; compressors and pumps vary.
TakeawayCompressors and pumps draw far more than 300 W to start. A fridge needs about 1,000 W, which rules out every 300 W unit here. Our small pick starts one on its 1,200 W surge, then runs it under 2 hours. A ½ hp well pump needs about 2,200 W to start; every pick from 1 kWh up has a published surge of 3,000 W or more. → EcoFlow RIVER 3 Plus · check price
Uses the same 62% / 87% usable factors as the charts above. Add your loads together if you run several at once.
A fridge, pump or heater rules out the 300 W units (surge chart).
Small loads get about 62% of the label, big ones about 87% (usable Wh).
Buy a unit that takes add-on batteries rather than a second stand-alone box: 10 here do (filter by Add-on batteries).
Well pumps, dryers and some HVAC do. The Apex 300, the DELTA Pro 3 and the Anker F3800 Plus list 240 V from one unit; the Jackery HomePower 3600 Plus needs a second unit.
In Germany and looking at balcony solar with storage instead? Different product, different rules (800 W feed-in cap): see our Balkonkraftwerk comparison (in German).
For a fridge, look at 1 kWh and up. A full-size refrigerator runs about 150 W but needs about 1,000 W to start, which rules out every 300 W unit here. All nine units in the 1 kWh group start one, and those over 1,000 Wh run it about 6 hours; a 2 kWh unit manages about half a day. Filter by Fridge to see the 25 that qualify.
Every class from 1 kWh up, on our arithmetic. For a 40 W CPAP that needs 8 hours, the EcoFlow RIVER 3 Plus (286 Wh) gives about 4.4 hours, about half a night; the Anker SOLIX C1000 Gen 2 (1,024 Wh) about 16 hours; and the Anker SOLIX S2000 (2,010 Wh) about 31 hours. See the runtime chart.
Less than the label. Across the twelve units Outdoor Life tested, they got 49–77% of the label at a 34 W load and 78–92% (the Oupes’s first run: 76%) at 380 W. By the middle of those results, a 1,000 Wh label gives about 600 Wh overnight and about 870 Wh at 380 W. The gap is the inverter running itself. See label vs. outlet.
Whichever covers what you run at the same time: continuous W must be at least the total you run, and surge W at least what it takes to start. A 1,000 W microwave draws about 1,300 W and a 1,500 W space heater uses all of a 1,500 W unit. Check watts separately from capacity: the 2,010 Wh Anker SOLIX S2000 has 1,500 W continuous, a big battery with a small inverter.
A ½ hp well pump runs about 800 W but needs about 2,200 W to start; every pick from 1 kWh up has a published surge of 3,000 W or more. Many well pumps, dryers and some HVAC need 240 V: the BLUETTI Apex 300, the EcoFlow DELTA Pro 3 and the Anker SOLIX F3800 Plus list that from one unit, and the Jackery HomePower 3600 Plus needs a second unit.
Look at 2.7 kWh and up. Our pick there, the Jackery HomePower 3600 Plus (3,584 Wh), runs a fridge for about 21 hours and a 40 W CPAP for about 56 hours, and takes add-on batteries to 21 kWh. If you need 240 V from one box, look at the Apex 300, the DELTA Pro 3 or the F3800 Plus.
A model is on this page if Amazon showed 600 or more of it bought in the past month, or if at least three major US buying guides recommend it, and its maker sells it new in the US. Specs come from each maker’s US site and manuals, checked September and October 2026, as each card’s source line says; a figure the maker doesn’t publish is left blank. † figures are Outdoor Life’s measurements (it tested the Yeti 700, the AC180 and the first-generation C1000 exactly); every other overnight figure is label Wh × 62%.
Prices, star ratings and rating counts are Amazon’s, on the date shown on each card. For 4 of the 33 units we have no Amazon price we could check, so their price is blank and their button goes to Amazon or the maker. The “bought in past month” badges are Amazon’s, recorded Oct 17, 2026. Rating counts are often pooled across a model’s variants.