The short answer: the Anker SOLIX F3800 Plus Smart Home Backup Power Kit is worth buying if you need 240V power, meaning a well pump, a central air unit or an electric water heater, or if you want a system you can grow. Anker lists it at 3,840Wh with 6,000W of output on both 120V and 240V, and it is listed at $3,499.99 at the time of writing. If you only need to keep a fridge, Wi-Fi, lights and phones alive, a smaller 120V unit does the job for far less.
Most people shopping for home backup find the same wall. The big, well-known power stations are 120V only, so they run a fridge and a laptop but cannot start a well pump or a central air unit, however large the battery. The F3800 Plus is one of the cheaper ways past that wall. This page explains what it actually runs, for how long, and where it falls short, so you can decide before spending close to $3,500.
The specifications that matter
These are the figures Anker publishes for the unit. Prices and kit contents change, so the product page is the final word.
| Specification | What Anker lists | Why it matters |
|---|---|---|
| Capacity | 3,840Wh | How long the battery carries your list |
| Output | 6,000W | How much can run at once |
| Voltage | 120V and 240V split-phase | The only way to run a well pump or central air |
| Battery type | Lithium iron phosphate | Long life, and stable when used indoors |
| Solar input | Two inputs, up to 3,200W in total | How quickly panels refill it |
| Expansion | Extra 3,840Wh batteries | Capacity you can add later |
| Warranty | Five years, per Anker | Worth confirming on the day you order |
Two cautions. Retailers quote different totals for how far the unit can expand, so we are not printing one: check the current figure on the product page. And the Smart Home Backup Power Kit is a bundle, so look at the list of what is in the box before you assume it includes a transfer switch, panels or expansion batteries.
What it runs, and for how long
The table below uses the 3,840Wh battery and assumes about 85 percent of it is usable after inverter losses, which is roughly 3,260Wh. The appliance figures are typical draws, not measurements of your own equipment. Your nameplate numbers will differ.
| Appliance | Typical draw | About how long on one battery |
|---|---|---|
| Wi-Fi router and modem | 20 to 40W | Several days |
| LED lights, a few rooms | 50 to 100W | 30 to 60 hours |
| Refrigerator (cycling) | 150W running, about 1,200Wh a day | About 2.5 days |
| Gas furnace blower | 400 to 600W | 6 to 8 hours of running time |
| Sump pump | 800 to 1,200W while running | A full day or more, since it runs in short bursts |
| 1 HP well pump (240V) | About 1,200W running | 2 to 3 days at 30 to 60 minutes of pumping a day |
| Window air conditioner | 500W | About 6 hours |
| Electric water heater | 4,500W | Under an hour |
| Central air conditioner | 3,000 to 4,000W | About an hour |
The pattern is simple. Anything that moves water, cools food or blows air in short bursts is cheap to run. Anything that makes heat is not. The 6,000W output means the F3800 Plus will start nearly all of these, but a single battery will not keep the heaviest ones going for long.
Three example outage days
The well-water household. The fridge (1,200Wh), a well pump pumping for 45 minutes (about 900Wh), the router (about 700Wh) and lights (about 600Wh) come to roughly 3,400Wh. That is almost exactly one battery per day, which is why people on wells usually add an expansion battery or panels.
The cold-snap household. A gas furnace in deep cold uses about 3,000 to 5,000Wh a day for the blower and ignition. With the fridge and Wi-Fi, one battery lasts about a day. This is the case where panels or a second battery matter most. Our guide to running a furnace on a solar generator has the detail.
The short-outage household. If outages in your area last four to eight hours, one battery covers the fridge, Wi-Fi, lights, a sump pump and phone charging with room to spare, and you never touch the expansion option.
How it refills
A battery that cannot recharge is a countdown timer. Anker lists the F3800 Plus as accepting solar through two inputs, up to 3,200W in total, which means the unit is not the limit on refill speed. How many panels you buy is. As a rough guide, a 400W panel in good sun gives back about 1,200 to 1,600Wh in a day, so one battery’s worth of daily use needs about two to three such panels, and fewer in summer than in winter. Our portable solar panel comparison shows what real panels deliver, and the panel cable guide covers the connectors.
You can also recharge from a wall outlet before a storm, which is the cheapest way to start an outage at 100 percent.
What it is missing
An honest review has to say where a product stops.
- It does not connect itself to your house. Running a hard-wired load such as a well pump or furnace needs a transfer switch or smart panel installed by a licensed electrician. Never feed a house circuit through a dryer outlet or any improvised cable. That can send power back up the street and endanger the people repairing the line.
- It is heavy. Anker lists it at well over 100 pounds, so you set it up once and leave it, rather than carrying it around like a camping battery.
- Central air is possible, not practical. It will start the compressor, but one battery runs it for about an hour.
- It is a lot of money for a short outage. If your outages last hours, a smaller unit does the same job.
- We could not test it ourselves. The figures here come from Anker’s published specifications and standard appliance draws, not from our own bench testing.
F3800 Plus or a Jackery
The decision is mostly about voltage. The Jackery HomePower 3000 holds 3,072Wh and puts out 3,600W, but only on 120V, so it cannot run a 240V well pump or central air. It is cheaper, it ships with panels in its bundle, and for a fridge-Wi-Fi-lights-CPAP list it is the better buy. If your list includes anything 240V, the F3800 Plus or the Jackery Solar Generator 5000 Plus is where the shortlist begins. Our three-brand comparison lines them up on price and capacity, and the what to buy guide starts from your must-run list.
Against the EcoFlow, the story is price against size. The DELTA Pro Ultra comparison shows the EcoFlow kit costing more than twice as much for more storage and far more solar input. For most homes that need 240V but not the whole house, the Anker is the sensible first step.
Who should buy it
Buy the F3800 Plus if:
- You are on a well and need a 240V pump to keep running
- You want to carry a furnace blower, fridge, sump pump and Wi-Fi for a day or two
- You would rather start with one battery and add more once you know your real usage
- You are willing to pay an electrician to wire a transfer switch
Skip it if:
- Your list is a fridge, lights, phones and a CPAP, where the HomePower 3000 is enough
- Your outages last a few hours and nothing on your list is 240V
- You want something you can carry to a campsite
Before you order
- Write down the nameplate wattage and voltage of everything on your must-run list.
- Check your breaker panel: a double breaker means a 240V load.
- Read what the kit contains on the product page, including whether a transfer switch is included.
- Decide how many batteries and panels you want on day one, then check the current expansion figure.
- Book the electrician before the storm season, not during it.
Anker SOLIX F3800 Plus at Outbound Power ($3,499.99 at time of writing)
Keep reading: Best solar generator for a well pump · Cheapest 240V home backup power · How to size a solar generator