EcoFlow DELTA Pro 3 vs Anker SOLIX F3800 Plus: Which for 240 V Home Backup?

Buy the Anker SOLIX F3800 Plus if you want the most 240 V output and room to grow to multi-day backup; buy the EcoFlow DELTA Pro 3 if a faster UPS switchover, a lighter unit and a slightly bigger starting battery matter more. Both are 120/240 V home-backup units with an L14-30 outlet for a transfer switch, and both need a licensed electrician to connect to your house.

EcoFlow DELTA Pro 3: the lighter one with the faster switchover

The DELTA Pro 3 holds 4,096 Wh and supplies 4,000 W at 120/240 V, with an 8,000 W surge. Its outlets are four 20 A household receptacles, a TT-30 for an RV, a NEMA 6-20 at 240 V and an L14-30 at 120/240 V, the one an electrician wires to a transfer switch or inlet. EcoFlow lists a 10 ms UPS switchover and UL 9540 listing. It weighs 113.54 lb and rolls on wheels.

EcoFlow rates the battery for 4,000 cycles to 80%. Solar goes in through two inputs: up to 1,600 W at 30–150 V and up to 1,000 W at 11–60 V, 2,600 W in all. Extra batteries take it to 12,288 Wh. X-Boost lets heating loads up to 6,000 W run at reduced power. 12 V power comes from DC5521 and Anderson ports rather than a confirmed car socket. EcoFlow's 5-year warranty is 3 years plus 2 more when you register in the app. For whole-circuit backup, EcoFlow's Smart Home Panel 2 works with the DELTA Pro 3; retailers list professional installation as required.

Anker SOLIX F3800 Plus: more output and a much higher ceiling

The F3800 Plus holds 3,840 Wh and supplies 6,000 W at 120/240 V, with a 9,000 W surge (another Anker page says 10,200 W; we use the lower). It has six 120 V outlets, a TT-30 and an L14-30, and a 20 ms UPS switchover. Two solar inputs take up to 1,600 W each at 11–165 V, 3,200 W in all. Up to six BP3800 batteries take it to 26,880 Wh, more than twice the EcoFlow's maximum.

Its wall charging is 1,800 W from a standard outlet, and Anker says it charges at up to 6,000 W through its 240 V Home Power Panel or a generator via the Generator Input Adapter. The Home Power Panel is a 12-circuit backup load center for indoor installation; Anker also sells a 10-circuit manual transfer switch. The battery is rated for 3,000 cycles to 80%, and the warranty is 5 years. The trade-off is weight: Anker pages give 132.3 to 136.7 lb, and we use the lower figure.

How do they connect to a house?

Both units connect the same basic way: the L14-30 outlet feeds a power inlet box with an interlock, a manual transfer switch, or the brand's smart panel. Each of these keeps the house disconnected from the grid while the battery runs it. All of them are permanent electrical work, so hire a licensed electrician and pull a permit. The electrician also sets up the neutral-ground bonding for the switch you choose. Never use a double-male cord or plug either unit into a wall or dryer outlet to feed the house.

Who should buy which

• Buy the Anker SOLIX F3800 Plus if a 240 V well pump shares the station with a sump pump or other motors, want to run several big loads at once, or plan to build toward several days of backup with extra batteries and a large solar array.
• Buy the EcoFlow DELTA Pro 3 if you work from home on a desktop computer, want the more manageable unit to move, or expect one day of essentials on a single battery to be enough most of the time.
• Buy neither if you only need a fridge, Wi-Fi and lights; a 2 kWh unit does that without any house wiring. Our home backup guide sorts the options by outage type, and the sizing quiz checks your devices.