FOSSiBOT’s F2400 packs a 2,048Wh LiFePO4 battery and a 2,400W pure sine wave inverter into a 48.5 lb box, according to the company’s US product page, and it was listed at $669 on FOSSiBOT’s own store when we checked in October 2026. That price works out to roughly 33 cents per watt-hour, low for a 2kWh-class station. The trade-offs show up in the spec sheet: no battery expansion, solar input capped at 500W, and a 1,100W wall charger rather than the 1,800W+ rates bigger brands advertise. This guide walks through FOSSiBOT’s published specs and manual, with every runtime figure marked as an estimate.
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FOSSiBOT F2400 on Amazon · F2400 on FOSSiBOT
We haven’t put the F2400 on our bench yet; a hands-on video review is planned. Until then, everything here comes from FOSSiBOT’s product page, FAQ and user manual, plus our own math.
F2400 at a Glance
| Spec | FOSSiBOT F2400 (US model) |
|---|---|
| Capacity | 2,048Wh, 51.2V LiFePO4 pack (EVE cells, per FOSSiBOT) |
| Cycle rating | 3,500+ cycles to 80% (spec table); 4,000+ in FOSSiBOT’s marketing copy |
| AC output | 2,400W rated, 4,800W surge, pure sine wave |
| AC outlets | 6 (US and JP models; EU model has 3) |
| USB-C | 1 × 100W PD, 3 × 20W PD |
| USB-A | 2 × 18W QC3.0 |
| 12V DC | 1 × 12V/25A RV-style outlet, 1 × 12V/10A car outlet, 2 × 12V/3A DC5521 |
| AC charging | Up to 1,100W, adjustable from 300W with a knob |
| Solar input | 11.5–50V, 20A, 500W max |
| AC + solar | Up to 1,600W combined |
| Car charging | 12V/24V socket |
| UPS switchover | Listed as 10ms in one spot and under 8ms in another |
| Weight | 48.5 lb (22 kg) |
| Dimensions | 15.2 × 11.18 × 12.64 in (386 × 284 × 321 mm) |
| Expansion | None (“F2400 is a single unit,” per FOSSiBOT’s FAQ) |
| Warranty | Listed as “2+3 years” in the spec table; promoted as 5-year full-device |
Two numbers on FOSSiBOT’s page don’t quite agree with each other, the cycle count and the UPS switchover time, so we’ve listed both. If either matters for your purchase, ask FOSSiBOT support which figure applies to the current production run.
Who the F2400 Makes Sense For
- Budget home backup: 2kWh will keep a fridge, router, lights and phones going through most overnight outages, and six AC outlets cover the essentials.
- Job sites and garages: the 2,400W inverter and 4,800W surge rating cover circular saws, drills and air compressors that smaller stations can’t start.
- RV and car camping: the 25A RV-style 12V outlet is useful for 12V fridges and water pumps, and the 500W solar input refills the battery in a long sunny day.
It’s less suited to anyone who wants to grow capacity later, plans to wire in a transfer switch with 240V, or needs to carry a station far. At 48.5 lb with no wheels, it’s a two-hand lift. FOSSiBOT sells a separate foldable cart, listed at $79.99 on its store, rated to carry up to 50 lb.
Runtime Estimates
FOSSiBOT’s FAQ gives its own runtime formula: watt-hours × 0.85 ÷ device watts. We used the same 85% factor, which leaves about 1,740Wh usable. These are our estimates, not FOSSiBOT test results.
| Load (average draw) | Estimated runtime |
|---|---|
| Wi-Fi router + modem (20W) | ~87 hours |
| CPAP, no humidifier (40W) | ~43 hours (about 5 nights of 8 hours) |
| 12V compressor fridge (60W average) | ~29 hours (FOSSiBOT quotes the same 29h for a 60W cooler) |
| Full-size fridge (150W average while cycling) | ~11–12 hours |
| 43-inch TV (110W) | ~15–16 hours |
| Microwave (1,000W input) | ~1 hour 45 minutes of total run time |
| Space heater on high (1,500W) | ~70 minutes |
FOSSiBOT’s product page lists similar examples, including about 1.7 hours for an 1,100W coffee maker and 87 minutes for a 1,200W electric saw. A fridge’s real number depends heavily on how often its compressor runs; our refrigerator wattage guide explains how to estimate your own.
What the 2,400W Inverter Can Start
Output is the F2400’s strongest spec for the money. FOSSiBOT’s FAQ says that above 2,400W the unit lowers its output voltage to keep heating loads running, and it shuts off when voltage falls below 78V or the load passes 4,600W. Here’s how common loads compare with the continuous rating:
| Appliance (typical nameplate) | Within 2,400W continuous? |
|---|---|
| Full-size fridge (startup surge 600–1,200W) | Yes |
| Microwave (1,000–1,500W input) | Yes |
| Hair dryer (1,600–1,875W) | Yes |
| Circular saw (1,200–1,800W) | Yes |
| Window AC, 8,000 BTU (~700W) | Yes |
| Microwave + coffee maker together (~2,200W) | Yes, but close to the limit |
| Electric dryer or 240V well pump | No (120V only) |
Motors draw a short burst on startup that can run several times their running watts. Our surge vs running watts explainer covers how to read those numbers before you plug in a compressor or pump.
Charging: Wall, Solar, Car
Wall charging and the input knob
The F2400 has a rotary knob that sets AC charging power between 300W and 1,100W. FOSSiBOT lists these full-charge times:
| AC input setting | FOSSiBOT’s full-charge time |
|---|---|
| 1,100W | About 2 hours |
| 900W | About 2 hours 40 minutes |
| 700W | About 3 hours 20–30 minutes |
| 500W | About 4 hours 30 minutes |
| 300W | About 7 hours |
The low settings are useful on a small generator or a weak circuit. FOSSiBOT notes you can drop the input when the supply voltage is low, which keeps a 2,000W inverter generator from overloading while it also powers other loads.
Solar
Solar input runs through an MPPT controller rated 11.5–50V and 20A, up to 500W, with an Anderson-style or XT90 input depending on the manual revision and an included MC4 adapter cable. FOSSiBOT says 500W of panels can refill the battery in about 4 hours in strong sun, and AC plus solar together (1,600W) in about 1.5 hours.
The 50V ceiling is the number to respect. FOSSiBOT’s manual says damage from exceeding it isn’t covered by the warranty. Its FAQ recommends two 200W panels, and it warns against mixing panels with different wattages or voltages. A typical 200W 12V-class panel has an open-circuit voltage (Voc) around 22–25V, so two in series lands near 45–50V on a warm day and can go higher in cold weather, when Voc climbs. Check your panel’s label and the coldest temperatures you’ll see; if the series Voc gets close to 50V, wire the pair in parallel instead. Our series vs parallel guide and solar panel specs explainer show how to do the math.
| Solar setup (estimates) | Typical real output | Time to full from empty |
|---|---|---|
| One 200W panel | ~130–150W | ~14–16 hours (two sunny days) |
| Two 200W panels | ~260–300W | ~7–8 hours |
| 500W of panels (at the cap) | ~350–400W | ~5–6 hours |
Real output usually lands at 65–80% of a panel’s rating because of heat, angle and haze. Luis saw that firsthand when the 60W panel in his BLUETTI Elite 30 V2 solar review produced about 35–40W in direct sun at the lake.
Car charging
FOSSiBOT lists about 17 hours from a 12V socket (about 100W) and 8.5 hours from 24V (about 200W). That’s a top-up option for long drives, not a primary charging method.
UPS Mode for Home and Office
The F2400 can pass wall power through to your devices while charging and switch to battery when the grid drops. FOSSiBOT’s page lists the switchover as 10ms in its feature list and “under 8ms” further down. Either figure is fast enough for most fridges, routers and lights. Desktop PCs vary: many ride through a 10ms gap, but some with smaller power supplies don’t. Test yours by unplugging the station from the wall while the PC runs, before you rely on it.
Keep the auto-off behavior in mind. FOSSiBOT’s FAQ says the AC and DC outputs turn off after 8 hours with no load, and USB ports after 5 minutes. A router or fridge keeps the AC side awake, but a load that only cycles on occasionally might not.
How It Compares on Price per Watt-Hour
The F2400’s main selling point is cost. At the $669 we saw on FOSSiBOT’s US store, it works out to about $0.33 per Wh. Name-brand 2kWh stations often list at two to three times that, though sale prices move constantly. What you give up for the savings:
- No expansion battery: 2,048Wh is the ceiling.
- Slower wall charging: 1,100W compared with the 1,800–2,400W some rivals offer.
- No app listed: FOSSiBOT’s spec sheet doesn’t mention Wi-Fi or Bluetooth control, so settings are on the front panel and knob.
- 120V only: no 240V output or split-phase pairing.
If you’d rather have an app and expansion, our Delta 3 Max vs Jackery, Anker and BLUETTI comparison covers the higher-priced options, and our price-per-Wh breakdown shows how to compare them fairly.
Setup Tips From the Manual
- Charge it fully first and confirm all outputs work before an outage or trip.
- Store it above 50% and top it up every 3 months, per FOSSiBOT’s shelf-life guidance.
- Don’t charge below freezing. FOSSiBOT lists charging at 32–104°F and discharging down to -4°F.
- Use the rubber port covers. FOSSiBOT says they protect the USB and DC ports from dust and splashes, but the unit isn’t waterproof.
- Match your panels. Use identical panels, MC4 connectors and a total under 50V and 500W.
FAQ
How long does the FOSSiBOT F2400 take to charge?
FOSSiBOT lists about 2 hours at the 1,100W AC setting, about 4 hours on 500W of solar in strong sun, and about 1.5 hours with AC and solar combined.
Can the F2400 run a refrigerator?
Yes. A typical full-size fridge averages 100–200W while cycling, and its startup surge sits well inside the 4,800W surge rating. Our estimate is roughly 11–12 hours at a 150W average.
Can I add an extra battery to the F2400?
No. FOSSiBOT’s FAQ says the F2400 is a single unit with no expansion port.
What solar panels work with the F2400?
Panels with MC4 connectors that total 500W or less and stay within 11.5–50V. FOSSiBOT recommends two 200W panels, and it says not to mix panels of different wattage or voltage.
Is the F2400 a good UPS?
FOSSiBOT rates the switchover at 10ms (or under 8ms, depending on where you look on its page). That suits fridges, routers and most electronics; test a desktop PC before relying on it.
How heavy is the F2400?
48.5 lb (22 kg). FOSSiBOT sells a foldable cart rated for 50 lb as an add-on.
What warranty does it have?
FOSSiBOT’s spec table lists “2+3 years,” and the product page promotes a 5-year full-device warranty. Confirm the terms with FOSSiBOT for your region when you buy.
Bottom Line
On paper, the FOSSiBOT F2400 delivers a lot of station for the money: 2,048Wh of LiFePO4, a 2,400W inverter with 4,800W surge, six AC outlets and a 25A 12V outlet, at a price well below the big names when we checked. It suits budget home backup, garages and RV trips where capacity and output matter more than an app or expansion. If you need more than 2kWh someday, or want 240V, look at an expandable system instead. Luis’s on-camera review is planned and will add real runtime and recharge numbers to this page.
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