Best whole-home in power stations and solar
A 4 kWh LFP station with 120/240 V output that grows to 48 kWh and feeds house circuits through an electrician-installed panel or transfer switch.
Our score: 8.4/10 out of 10Researched, not lab-tested
- Battery capacity
- 4,096 Wh
- AC output (continuous)
- 4,000 W
- Expandable to
- 48 kWh
- Cell chemistry
- LiFePO4 (LFP)
Is it right for you?
Pros
- 4,096 Wh LFP, rated 4,000 cycles to 80%
- 4,000 W at 120/240 V, incl. an L14-30R (8,000 W surge)
- Expands to 12 kWh per unit, up to 48 kWh as a system
- Up to 2,600 W of solar input over two ports
Cons
- 113.5 lb: it rolls, it doesn't carry
- Panel or transfer-switch hookup is licensed electrician work
- Charges only between 0 and 45 °C (32 to 113 °F)
- UL 9540 is in EcoFlow's product title only; record not checked
- Best for
- Homes that want quiet, fume-free backup of key circuits (furnace, fridge, sump, well pump) through a panel connection, with solar to stretch long outages.
- Not for
- Anyone wanting a grab-and-go box, a DIY panel hookup, or storage in a room that drops below freezing when it needs to charge.
Our verdict
The DELTA Pro 3 is the battery we would look at first for backing up house circuits rather than a few plugs. It stores 4,096 Wh of LFP, rated for 4,000 cycles to 80%, and gives 4,000 W continuous at 120 or 240 V (6,000 W with X-Boost, 8,000 W surge). That 240 V output, including an L14-30R, is what lets it run a well pump or a 240 V circuit through EcoFlow’s Smart Home Panel 2 or a transfer switch.
It grows with the house: two extra batteries take one unit to 12 kWh, and EcoFlow quotes up to 48 kWh as a system. Up to 2,600 W of solar over two inputs stretches a long outage, and EcoFlow’s dual-fuel Smart Generator can top it up automatically. EcoFlow’s Canadian store sells the same model.
The catches: at 113.5 lb it rolls rather than carries, the panel connection is an electrician’s job, and it charges only between 0 and 45 °C. EcoFlow’s product title calls it UL 9540.
Setup and safety
Indoors, no fumes, but not a DIY panel job. A battery makes no exhaust, so it can live in the basement or a utility room, as long as that room stays above freezing when it needs to charge. Plugging appliances into its outlets is fine. Feeding house circuits is not: EcoFlow says the Smart Home Panel 2 or transfer switch must be installed before use, and that is licensed electrician work. Never feed the house from a wall outlet with a male-to-male cord: it backfeeds the grid and can kill line workers (how a transfer switch or interlock prevents it).
Rules for a panel hookup. A battery that feeds the home through a panel or transfer switch is a permanent backup connection, so it follows the same path as a generator hookup: a licensed electrician and, in most places, a permit or a notice to your utility, sometimes before you buy. Rules differ by province and state (see the rules by province and state).
What it realistically runs. Forum threads about power stations repeat one lesson: buyers expect “whole home” and get a few circuits. With 4 kWh, plan on the essentials (furnace blower, fridge, sump pump, well pump, lights) rather than an electric range, water heater and central air. In bypass mode it passes up to 15 A for three hours, then 12 A continuously, while it charges. See our power station comparison for smaller boxes.
Specs
EcoFlow DELTA Pro 3 Power Station (4096Wh, 120/240V)
Battery
| Battery capacity | 4,096 Wh |
|---|---|
| AC output (continuous) | 4,000 W |
| Expandable to | 48 kWh |
| 240 V output | Yes |
| Cell chemistry | LiFePO4 (LFP) |
| Cycle life | 4,000 cycles |
| AC surge | 8,000 W |
Charging
| Solar input (max) | 2,600 W |
|---|---|
| UPS switchover | 10 ms |
Other details
| Weight | 113.5 lb |
|---|---|
| App control | Yes |
| Warranty | 5 years |
| Safety listing | UL 9540 (per EcoFlow's title) |
Maker’s figures, checked 3 Nov 2026.
DELTA Pro 3 questions
Can the DELTA Pro 3 back up my whole house?
It can back up selected circuits, not everything at once. Through EcoFlow’s Smart Home Panel 2 or a transfer switch it powers hardwired loads at 120 or 240 V, up to 4,000 W continuous. With extra batteries it stores much more, but the output limit stays, so choose the circuits that matter: heat, fridge, sump, well pump, lights.
Do I need an electrician to install it?
To connect it to your panel, yes: EcoFlow says the Smart Home Panel 2 or transfer switch must be installed before use, and that is licensed electrician work. Used only as a plug-in box with appliances plugged straight into it, no panel work is involved.
Can it charge in a cold garage?
Not below freezing. EcoFlow gives a charging range of 0 to 45 °C, and discharge and storage from -10 to 45 °C. In winter, put it in a heated basement or utility room, especially if solar or a generator is meant to recharge it during an outage.
Is it sold in Canada?
Yes. EcoFlow’s Canadian store sells the same model, EFDELTAPRO3-US. The Smart Home Panel 2 and any transfer switch still have to suit Canadian code, which is your electrician’s call.