Anker SOLIX F3800: the battery that speaks for the whole house

Our pick

Best for 240 volts

Anker SOLIX F3800

The only cabinet here that speaks 240 volts, so the well pump keeps its job.

$2,199.98

Price checked Aug 26, 2026

See Anker SOLIX F3800 on ankersolix.com, opens in a new tab

Most batteries in this price range are kitchen machines. Lovely ones, but the moment a 240-volt load enters the conversation they all go quiet. The F3800 is the one that answers. It’s here because it’s the split-phase machine we can show you with the maker’s own photo and dated figures, and for a house where the well or the dryer is non-negotiable, it turns a generator-sized problem into a rolling cabinet and an electrician’s visit. (The usual boundaries hold: no Powerwall talk, no rooftop quotes, and no numbers Anker didn’t print, outlet counts and solar-input watts included.)

The tank, the muscle, and the surge

The tank is 3,840 Wh, and the kitchen translation goes like this: a cycling fridge takes roughly one to two kilowatt-hours a day (closed fridge ~150 W, ~1/3 duty cycle), the lights and the internet are rounding error beside it, and a 1,500-watt space heater will drink the whole cabinet before the evening news ends. Plan as if you won’t drain it to the floor. You shouldn’t, and LFP chemistry will quietly thank you. That ratio is the honest shape of the product: much more inverter than any portable station carries, and still, always, a tank.

The muscle is 6,000 watts steady with a 9,000-watt surge. Those are Anker’s listed figures as of August 26, 2026, and generous ones. A caution offered with care: a well pump’s wake-up gulp (electricians call it locked-rotor current) can be startling, and 9,000 watts is a rating, not a promise that every motor in the county will spin. Owners keep saying the cabinet will start a household well when the numbers line up; your pump, in daylight, is still the check that counts. And the voltage line (120/240 V) is why this page lives in the home-battery category at all: it’s the one line the 120-volt machines can’t write.

The price that day was $2,199.98, with no crossed-out number beside it. Sales move. The live page always wins. See tonight’s price at Anker →. Same price to you either way, disclosure here.

1. Confirm 240 volts is truly required. If it isn’t, you’d be paying for an inverter class you’ll never wake up.
2. Add up the must-keep watt-hours for the outages your region actually serves.
3. Budget the electrician if wall wiring is the point. The buying guide walks the legal paths.
4. Plan the refill (wall power first, panels second) before trusting extra modules to save a sunless week.
5. Walk the route from the delivery truck to the basement with 132.3 pounds in mind. Bring a friend, then keep that friend.

Weight, and where it lives

132.3 pounds decides placement, so let it. The casters glide on a flat slab and surrender completely at the first stair. Two people and a plan beat one person and an optimistic estimate, every single time. Give it a dry corner away from where a tired water heater weeps, with enough clearance that the fans breathe easy. The telling detail: this is still, formally, a “portable” product (a tall wheeled cabinet, not a wall-mounted install), which means it rolls, it just doesn’t travel. For scale, the Explorer 2000 Plus is 61.5 pounds and the AC200L 62.4. The F3800 is the one that picks its spot and keeps it.

Growing it, and refilling it

Expandable: yes. That’s Anker’s word, and they don’t name the companion battery on the page we snapshotted, so neither will we (the live page will, the week you buy). Extra modules stretch the must-list beautifully. What they never do is turn 6,000 watts into a whole-home HVAC plant. If the house truly must impersonate the grid for a week, read battery vs standby and then what the engine path costs. Sometimes the engine is simply the right tool, and we’ll say so.

Refills come from the wall between flickers, and from daylight when the grid stays down. Anker’s folder in our catalog is the PS400: 400 watts, 35.3 pounds, sealed to IP67, with an open-circuit voltage Anker never pins down, so we leave that cell blank. Confirm the F3800’s solar input window on the live page before you wire anything in series. Voltage is the one spec where a guess costs you hardware.

• 3,840 Wh of LFP storage · $2,199.98 on August 26, 2026.
• 6,000 W steady · 9,000 W surge · 120/240 V: the line that makes it special.
• 132.3 lb. Casters for floors, friends for stairs.
• Expandable, yes: more hours, same inverter class.
• A legal inlet or transfer switch the moment it touches house wiring. No exceptions, and you know why.

What we’re not claiming

Nobody here has cycled an F3800 through a January. This page is the job it fits plus Anker’s dated ratings, read closely and quoted honestly. We won’t claim cycle counts we didn’t have in the snapshot, promise the fans are whisper-quiet in every mood, or suggest it replaces a 20 kW liquid-cooled machine. It doesn’t, and it isn’t trying to.

If Anker’s live page disagrees with any number above on the day you buy, the live page wins. That’s the deal.

And the one condition that flips the verdict: if every load on your list turns out to be 120-volt, this inverter would sleep through its whole life at your house. Buy a 120-volt station instead and put the difference toward a nice dinner. Otherwise, the cabinet stands.

The category: home batteries · the homework: buying guide · corrections, always welcome: contact.