Fossibot FAC580
Up to 580W from the alternator while driving, about 6 times faster than a 12V outlet, compatible with most third-party power stations.
Characteristics
- Power: 580W max, up to 45A (12V/24V input)
- Charging speed: About 6 times faster than a 12V outlet
- Compatibility: Whole Fossibot lineup and most third-party stations
- Weight: 0.8 kg, wall mounted
- 580W while driving, broad third-party compatibility
Detailed overview: Fossibot FAC580 alternator charger
The Fossibot FAC580 alternator charger is a DC-DC charger designed to charge a power station straight from the vehicle's alternator while driving, far more efficiently than a simple 12V outlet. It delivers up to 580W, roughly 6 times the speed of a standard cigarette-lighter socket, to rebuild a portable battery's range mile after mile.
The FAC580 works in two modes: Mode 1 taps the alternator's surplus energy with the engine running to deliver up to 580W, while Mode 2 allows emergency charging with the engine off as long as the battery voltage stays high enough. Its input accepts 12V (12 to 18V) or 24V (24 to 33V) up to 45A, for an output of 45 to 80V and 15A maximum, with a stated conversion efficiency of 92%. Fossibot states compatibility with its entire power station lineup (F800, F1200, F2400, F3600 Pro, F1800, F7200) as well as with most third-party power stations that have a compatible 45 to 48V input.
The housing includes thorough electrical protection: short circuit, overcurrent, overheating, overvoltage, undervoltage, and reverse polarity. An active dual-fan cooling system keeps it running stable even on long drives. It operates from -4°F to 140°F and draws under 3W on standby. Very compact (182 x 162 x 47 mm, 0.8 kg), it mounts straight onto the vehicle body using its mounting brackets, and its 16-foot input cable makes routing to the starting battery easier.
Supplied with an input cable, output cable, screws, and a screwdriver, it suits most gas and diesel 12V/24V vehicles: cars, SUVs, RVs, trucks, and boats. It is not, however, compatible with electric vehicles. Backed by a 2-year warranty, it is an affordable way to genuinely put drive time to use for rebuilding your electrical range on the go.
Comparison
How does the Fossibot FAC580 alternator charger compare with other DC-DC chargers sold in the US? Here is how it stacks up against three well-known references.
| Criterion | Fossibot FAC580 | EcoFlow Plus 1000 | Bluetti Charger 1 | Renogy DCC50S |
|---|---|---|---|---|
| Max power | 580 W | 1000 W | 560 W | 500 W |
| Third-party compatibility | Most stations (45-48V) | Yes, with reverse charging | Yes | Yes (built-in MPPT) |
| Weight | 0.8 kg | 1.7 kg | 1.2 kg | 0.9 kg |
| Observed price | ≈ $199 to $299 | ≈ $329 | ≈ $299 | ≈ $248 |
In short, the FAC580 stands out for its noticeably lower price and light weight, at the cost of less power and fewer features (reverse charging, app) than the EcoFlow Plus 1000. Against the Bluetti Charger 1 and the Renogy DCC50S, at comparable power, it remains the most budget-friendly option. For a tight budget, the FAC580 is an excellent compromise.
Related video
Video: FOSSIBOT FAC580 INSTALLATION + TEST : DOES IT REALLY WORK? - Published on 25/08/2025
Our tester's review: Gilles Caron
On the road, the FAC580 genuinely lives up to its promise: wired to the starting battery, it charged our station at around 200W with the engine just idling, and considerably more once actually driving. Installation is straightforward, though the 16-foot input cable is a bit bulky to route neatly through the engine bay. The real strong point is the stated compatibility with almost every third-party power station, not just the Fossibot lineup, which is handy if you already own a station from another brand. The cooling does its job well, with no overheating noticed even on a long summer drive. One gripe raised by several buyers: the unit has no built-in fuse on the input cable, so you really do need to add one near the battery yourself, as the manual itself recommends. For its very reasonable price against the competition, the FAC580 remains an excellent deal for anyone who drives a lot.
Frequently asked questions: Fossibot FAC580 alternator charger
It works with the whole Fossibot lineup (F800, F1200, F2400, F3600 Pro, F1800, F7200), and Fossibot states compatibility with most third-party power stations that have a compatible 45 to 48V input.
Up to 6 times faster: a standard cigarette-lighter outlet tops out at a few dozen watts, versus 580W here at full power.
Yes, through its emergency charging mode, as long as the starting battery voltage stays high enough (around 12.75V minimum), though the available power is more limited in that mode.
Yes, it is recommended to add a fuse on the cable running from the battery's positive terminal to the charger, as with any automotive electrical installation, to protect the circuit.
No, it is designed for gas and diesel vehicles fitted with a 12V or 24V alternator: cars, SUVs, RVs, trucks, boats.
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