Two of the most powerful modular solar generators on the market, compared spec-by-spec. We break down capacity, solar input, expandability, app ecosystem, and real-world value to pick a winner.
Quick Answer: The EcoFlow DELTA Pro wins for grid-dependent homeowners who want the fastest AC recharging (1,800W X-Stream), automatic circuit failover via the Smart Home Panel, and the best app ecosystem. The BLUETTI AC300+B300 wins for solar-first users — it accepts 71% more solar input (2,400W vs 1,400W), costs ~$200 less at comparable capacity, and has longer cycle life. Both are LiFePO4 and expandable to 10kWh+. Choose based on whether your primary recharge source is the grid or the sun.
If your main recharging strategy is plugging into the wall when the grid is up, the EcoFlow DELTA Pro is your pick. Its X-Stream charging technology hits 1,800W from AC — meaning a full 3,600Wh recharge from empty to 80% in about 1.6 hours. No other portable unit in this class recharges from the wall that fast.
If your main recharging strategy is solar panels — whether rooftop, portable, or a ground-mount array — the BLUETTI AC300+B300 is your pick. It accepts 2,400W of solar input compared to the DELTA Pro's 1,400W. That's the difference between a full recharge by 1 PM and still waiting at 4 PM.
Both are modular, both use LiFePO4, and both expand to over 10kWh. The question is which recharge path matters more to you. Let's break it down.
| Spec | EcoFlow DELTA Pro | BLUETTI AC300 + B300 | Winner |
|---|---|---|---|
| Capacity | 3,600Wh | 3,072Wh | EcoFlow (+17%) |
| Output (Continuous) | 3,600W | 3,000W | EcoFlow (+20%) |
| Surge Output | 7,200W | 6,000W | EcoFlow |
| Solar Input | 1,400W | 2,400W | BLUETTI (+71%) |
| AC Charging Speed | 1,800W (X-Stream) | 3,000W (dual AC) | BLUETTI |
| Battery Type | LiFePO4 | LiFePO4 | Tie |
| Cycle Life | 3,500 (to 80%) | 3,500+ (to 80%) | Tie |
| Max Expansion | 25kWh (w/ Smart Home Panel) | 12,288Wh (4x B300) | EcoFlow |
| UPS Switchover | 30ms | <20ms | BLUETTI |
| Weight | 99 lbs | 44 lbs (inverter) + 73 lbs (B300) | BLUETTI (modular) |
| App Control | EcoFlow App (iOS/Android) | BLUETTI App (iOS/Android) | EcoFlow |
| Smart Home Panel | Yes (sold separately) | No (manual transfer switch) | EcoFlow |
| Price (base system) | ~$2,699 | ~$2,599 | BLUETTI (-$100) |
| Cost per Wh | $0.75/Wh | $0.85/Wh | EcoFlow |
On raw specs, EcoFlow takes more categories — but look closer. BLUETTI's two biggest wins (solar input and UPS switchover) are arguably the most important specs for someone buying a backup power system. If the grid goes down and your only recharge source is the sun, that 2,400W solar input is the spec that keeps your fridge running.
The DELTA Pro packs 3,600Wh in a single unit compared to the AC300+B300's 3,072Wh. That's 17% more energy storage. At 3,600W continuous output (7,200W surge), the DELTA Pro can start and run larger motor loads — sump pumps, small AC window units, and 15A power tools — more comfortably than the AC300's 3,000W continuous.
For most homeowners running essential circuits (fridge, lights, router, fans, phone charging), both have more than enough output. The 600W output gap only matters if you're running loads above 3,000W — which is uncommon in a backup scenario unless you're powering a portable AC unit or multiple high-draw appliances simultaneously.
Winner: EcoFlow DELTA Pro — more capacity and more headroom for high-draw loads.
See Today's DELTA Pro Price →This is where the AC300 pulls decisively ahead. 2,400W of maximum solar input is 71% more than the DELTA Pro's 1,400W. In practical terms:
For off-grid cabins, hurricane preparedness in the Southeast, and RV boondocking, solar recharge speed is the spec that separates "we'll be fine" from "we're running the generator dark by 9 PM." If you're investing in 1,000W+ of solar panels, you want a unit that can actually absorb that much input.
The DELTA Pro's 1,400W ceiling means adding a fifth or sixth solar panel provides zero additional benefit — the excess is wasted. The AC300 keeps absorbing until 2,400W.
Winner: BLUETTI AC300+B300 — faster solar recharge by a wide margin.
See Today's AC300+B300 Price →Both systems are modular and expandable, but EcoFlow's ecosystem goes further:
The Smart Home Panel is EcoFlow's secret weapon. It installs beside your main breaker panel and automatically switches selected circuits to battery power when the grid drops — no manual intervention needed. BLUETTI requires you to plug devices into the unit or install a separate automatic transfer switch.
However, BLUETTI's expansion path is significantly cheaper. Each B300 pack adds 3,072Wh for ~$1,599. EcoFlow's Extra Battery adds 3,600Wh for ~$2,699. That's $0.52/Wh for BLUETTI expansion vs $0.75/Wh for EcoFlow — BLUETTI is 30% cheaper to expand.
Winner: EcoFlow DELTA Pro — the Smart Home Panel gives it a functionality advantage, even though BLUETTI is cheaper to scale.
The EcoFlow DELTA Pro is a single 99 lb unit. Moving it requires two people or a hand truck. It has wheels and a telescoping handle, which helps on flat surfaces, but getting it into a truck bed or up stairs is a workout.
The BLUETTI AC300 system separates the inverter (44 lbs) from the battery (B300 at 73 lbs). You carry each piece individually. Neither is featherweight, but the heaviest single component is 29% lighter than the DELTA Pro. For RV owners and anyone storing the unit in a garage or basement, this modularity is a genuine advantage.
Winner: BLUETTI AC300+B300 — lighter individual components, easier to move in pieces.
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EcoFlow's app is the benchmark in portable power. It offers:
BLUETTI's app covers the basics (monitoring, remote control, firmware updates) but lacks the polish, depth, and Smart Home Panel integration that EcoFlow delivers. For non-technical users who want to set it and forget it, EcoFlow's app makes the DELTA Pro feel more like a home appliance than a piece of gear.
Winner: EcoFlow DELTA Pro — best-in-class app and Smart Home Panel integration.
At the base level, the math favors EcoFlow slightly. The DELTA Pro delivers $0.75/Wh vs the AC300+B300's $0.85/Wh — you get more energy per dollar with EcoFlow's single-unit design.
But if you plan to expand, the equation flips. BLUETTI B300 packs cost $0.52/Wh for expansion, while EcoFlow's Extra Battery runs $0.75/Wh. A fully expanded BLUETTI system (AC300 + 4x B300 = 12,288Wh) costs roughly $8,995. An EcoFlow system with two DELTA Pros (7,200Wh) plus the Smart Home Panel costs around $6,800 — less total capacity for comparable money, but with automatic failover.
For raw capacity per dollar at scale, BLUETTI wins. For the smartest, most automated system, EcoFlow wins.
Winner: Tie — depends on whether you value capacity or automation.
Fastest AC recharging, best app, Smart Home Panel ecosystem.
Superior solar input, modular design, cheaper expansion path.
For most homeowners buying their first whole-home backup system in 2026, the EcoFlow DELTA Pro is the safer pick. The Smart Home Panel turns it into a genuine home battery system with automatic failover, the app is excellent, and X-Stream charging means you can top it off in under 2 hours from any outlet. The 3,600W output gives you more headroom for unexpected loads.
But if solar panels are your primary recharge strategy — and especially if you're building an off-grid or hurricane-prep setup — the BLUETTI AC300+B300 is the smarter investment. That 2,400W solar input is a decisive advantage, and the modular design makes it more manageable physically. Expansion is also 30% cheaper per Wh.
Our pick for most buyers: EcoFlow DELTA Pro.
Our pick for solar-heavy setups: BLUETTI AC300+B300.
Both are excellent, but they excel in different areas. The EcoFlow DELTA Pro charges faster from AC (1,800W X-Stream), has the best app ecosystem, and the Smart Home Panel provides automatic circuit failover for up to 10 circuits. The BLUETTI AC300+B300 accepts 71% more solar input (2,400W vs 1,400W), has faster UPS switchover (<20ms), and offers cheaper expansion batteries. For grid-dependent homes, EcoFlow wins. For solar-first homes, BLUETTI wins.
Both can power essential circuits (fridge, lights, router, fans, phone charging) for 12-24 hours. Neither can run central AC or an electric water heater continuously. The DELTA Pro outputs 3,600W (7,200W surge) and the AC300 outputs 3,000W (6,000W surge). With expansion batteries, the DELTA Pro scales to 25kWh and the AC300 to 12,288Wh. For true whole-home backup including heavy loads, consider the EcoFlow DELTA Pro Ultra or pairing either unit with rooftop solar.
BLUETTI AC300 wins solar charging decisively. It accepts up to 2,400W of solar input compared to the DELTA Pro's 1,400W — a 71% advantage. With peak sun and enough panels, the AC300 recharges 3,072Wh in under 1.5 hours. The DELTA Pro needs roughly 2.5 hours for 3,600Wh. If you rely on solar panels for recharging, the AC300 is the clear choice.
The EcoFlow DELTA Pro retails for approximately $2,699 (3,600Wh). The BLUETTI AC300+B300 bundle runs approximately $2,599 (3,072Wh). BLUETTI is ~$100 less for slightly less capacity. For expansion, BLUETTI B300 packs cost ~$1,599 each (3,072Wh) vs EcoFlow's ~$2,699 Extra Battery (3,600Wh) — making BLUETTI 30% cheaper per Wh to expand.
