When you are looking to back up your home or run a heavy-duty off-grid setup, you eventually run into these two giants: the Bluetti AC300 and the EcoFlow Delta Pro.
They both promise enough power to run a full-sized refrigerator, your coffee maker, and your workstation simultaneously. However, they approach the problem from completely different design philosophies. The Bluetti AC300 is a modular "brain" that requires external batteries to function, while the EcoFlow Delta Pro is a massive, self-contained unit on wheels. After putting both through their paces, the winner depends entirely on whether you value portability or customization.
Design: Modular vs. All-in-One
The Bluetti AC300 is not a standalone power station. It basically acts as the inversion and control center. To get any power, you have to pair it with at least one B300 (3,072Wh) battery module. This modularity is a huge plus if you need to move the system; you can carry the 44-pound AC300 separately from the 79-pound battery modules.
The EcoFlow Delta Pro is a different beast. It is a single, 99-pound unit. While it has wheels and a telescoping luggage-style handle, it is still a chore to lift into a truck bed or carry up stairs. The benefit is simplicity. There are no external cables to manage and no multiple boxes to stack. You just wheel it in, plug in your devices, and you are done.
Power and Capacity
Both systems are heavy hitters. The Bluetti AC300 offers a 3,000W pure sine wave inverter with a 6,000W surge capacity. The EcoFlow Delta Pro is slightly more powerful, boasting a 3,600W inverter (4,500W with X-Boost) and a 7,200W surge capacity.
If you are planning to run a large window AC unit or a space heater, the Delta Pro’s extra 600W of continuous power provides a safer margin. However, the AC300 wins on expansion. You can stack up to four B300 batteries for a total of 12,288Wh. The Delta Pro can also expand, but its ecosystem is slightly more rigid and expensive per watt-hour of added storage.
Charging Speeds
EcoFlow is the king of charging speed. The Delta Pro can hit a staggering 6,500W total input by combining AC, solar, and the Smart Generator. On AC power alone, it can charge from 0 to 100% in under two hours from a standard wall outlet.
The Bluetti AC300 is no slouch, supporting up to 5,400W of combined input (2,400W solar + 3,000W AC). It is plenty fast for most homeowners, but if you are cycling through your battery bank daily and need to top off quickly between solar windows, EcoFlow has the edge.
Connectivity and Ports
The Delta Pro features a dedicated 30A Anderson port and a 30A NEMA L14-30R port, which makes connecting it to a manual transfer switch for home backup incredibly easy. It feels like it was built for the "smart home backup" crowd.
The AC300 also has a 30A NEMA L14-30R port, but its overall port layout feels a bit more "off-grid workshop." It includes standard AC outlets, USB-C (100W), and two wireless charging pads on top, which is a nice touch for keeping your phone topped up without extra cables.
Final Verdict
Choose the Bluetti AC300 if: You want a modular system that you can grow over time. It is easier to move in pieces and the LiFePO4 chemistry in the B300 batteries is exceptionally durable.
Choose the EcoFlow Delta Pro if: You want the most powerful all-in-one unit available. Its integration with the EcoFlow Smart Home Panel and its superior charging speeds make it the better choice for serious emergency home backup.
Not sure how much power you actually need for your home setup? Check out our Sizing Calculator to see exactly which battery capacity fits your lifestyle.