EcoFlow DELTA Pro vs Bluetti AC300: The Battle for Whole-Home Backup
Table of Contents
The Short Answer
The EcoFlow DELTA Pro is the better buy for most people considering whole-home backup. It comes with 3600Wh built-in at $2,699 — a complete, usable unit from day one. The Bluetti AC300 is a modular system that requires purchasing the AC300 unit plus at least one B300 battery to function, pushing entry cost to ~$4,400 for 3072Wh. You pay 63% more for less initial capacity. The AC300 scales better at maximum capacity and accepts more solar (2400W vs 1600W), but those advantages only materialize if you commit to a large multi-battery installation. For most buyers setting up home backup for the first time, EcoFlow is the more rational starting point.
Quick Specs Comparison
| Spec | EcoFlow DELTA Pro | Bluetti AC300 + 1x B300 |
|---|---|---|
| Base Capacity | 3600Wh (built-in) | 3072Wh (B300 battery) |
| AC Output | 3600W (7200W surge) | 3000W (6000W surge) |
| Solar Input | 1600W (dual MPPT) | 2400W (dual MPPT) |
| AC Charge Time | ~1.8 hrs (0-100%) | ~1.5 hrs (B300, 3072Wh) |
| Weight (base unit) | 45kg | 15.9kg (unit only) + 50kg (B300) |
| Battery Type | LiFePO4 | LiFePO4 |
| Max Expandable | 25kWh (Smart Generator integration) | 12,288Wh (4x B300) |
| Smart Home Panel | Yes (optional) | No |
| Entry Price | ~$2,699 | ~$4,400 (unit + 1x B300) |
EcoFlow DELTA Pro Overview
The DELTA Pro is EcoFlow's serious home backup product. At 3600Wh internal LiFePO4 capacity and 3600W AC output, it covers a meaningful slice of home loads: refrigerator, TV, lights, phone charging, CPAP, and a window AC unit simultaneously. The 7200W surge handles nearly any residential appliance startup. It weighs 45kg, which means it lives in place — this is not a unit you carry to camping trips.
The ecosystem is what separates the DELTA Pro from a simple portable power station. EcoFlow's Smart Home Panel connects the DELTA Pro to your home's electrical panel, allowing you to designate which circuits receive backup power automatically during an outage. It's not a whole-home generator — it won't run your HVAC or electric range simultaneously — but it handles essential circuits without manual transfer switching. That level of integration is something Bluetti's AC300 cannot match.
Solar input tops out at 1600W via dual MPPT. With four 400W panels, you can recharge the 3600Wh battery in roughly 2.5 hours of peak sunlight. The DELTA Pro also accepts power from an EcoFlow Smart Generator for extended outages, creating a hybrid solar-plus-generator system with intelligent switching.
Expandability is impressive on paper: up to 25kWh via extra batteries and Smart Generator integration. In practice, most buyers never exceed one or two expansion batteries. The expansion battery (DELTA Pro Extra Battery, 3600Wh, ~$1,799) brings total to 7200Wh — enough for over 24 hours of essential circuit backup in most homes.
Bluetti AC300 Overview
The AC300 is fundamentally different from the DELTA Pro: it's a modular inverter unit with no built-in battery. To use it, you must purchase at least one B300 battery module. The AC300 unit alone ($2,299) is functionless without the B300 ($2,099). The entry system — AC300 + 1x B300 — costs approximately $4,400 for 3072Wh of usable capacity. Compare that to $2,699 for 3600Wh with the DELTA Pro. The math is not kind to Bluetti at the entry level.
Where Bluetti's modularity pays off is at scale. The AC300 accepts up to four B300 batteries for 12,288Wh of total capacity. Each B300 is a discrete 3072Wh unit that can be swapped, replaced, or charged independently. For a serious off-grid installation with a dedicated battery room, the Bluetti system offers more flexibility in how batteries are arranged and maintained.
The 2400W solar input is the AC300's standout specification — 50% more than the DELTA Pro's 1600W. With six 400W panels, you can potentially harvest 2400W/hour from solar. For off-grid cabins or large van builds where solar is the primary power source, this is a genuine advantage. On a 6-hour peak sun day, the AC300 system can harvest 14.4kWh versus the DELTA Pro's 9.6kWh — enough to make a meaningful difference in full off-grid autonomy.
The 3000W continuous AC output and 6000W surge lag behind the DELTA Pro's 3600W and 7200W. For homes with central AC (typically 3500-5000W), the AC300 may not handle that load where the DELTA Pro can. Bluetti recommends the AC300 for homes where the highest-draw appliance is under 3000W — which covers most essential backup scenarios but not whole-home power.
Cost Analysis: Entry to Full Scale
| Configuration | EcoFlow DELTA Pro | Bluetti AC300 System |
|---|---|---|
| Entry (functional system) | $2,699 (3600Wh) | ~$4,400 (3072Wh, unit + 1x B300) |
| Doubled capacity | ~$4,498 (7200Wh, +1 extra battery) | ~$6,497 (6144Wh, +1 B300) |
| Max expandable | ~$25,000+ (25kWh with Smart Generator) | ~$10,695 (12,288Wh, unit + 4x B300) |
EcoFlow wins at entry and mid-scale. At maximum capacity (Bluetti 12,288Wh vs EcoFlow 25kWh with Smart Generator), costs converge and Bluetti's per-Wh cost is actually competitive. But almost no residential buyer needs 25kWh of portable battery backup — that's commercial territory.
Where EcoFlow DELTA Pro Wins
- Entry cost: $2,699 for a fully functional 3600Wh system vs $4,400 to get started with Bluetti. EcoFlow delivers more initial capacity for 39% less money.
- Higher AC output: 3600W continuous and 7200W surge vs Bluetti's 3000W/6000W. Handles larger loads including central AC or electric range in short bursts.
- Smart Home Panel integration: Automatic circuit-level backup control with panel integration. Bluetti has no equivalent product.
- Smart Generator compatibility: Hybrid solar-plus-generator operation with intelligent switching. Extends off-grid capability indefinitely during extended outages.
- Better app: EcoFlow's app for the DELTA Pro allows detailed energy management, circuit scheduling, and remote monitoring.
Where Bluetti AC300 Wins
- Solar input: 2400W vs 1600W — the best solar input rate in this class. For off-grid installations with large panel arrays, Bluetti charges 50% faster from solar.
- Battery modularity: B300 batteries are discrete units that can be replaced individually without replacing the entire system. Long-term maintenance is more flexible.
- Max capacity ceiling: 12,288Wh with 4x B300 vs DELTA Pro's practical 7200Wh expansion. For large off-grid installations, Bluetti scales higher with a single inverter unit.
- Unit weight: The AC300 inverter unit is 15.9kg vs DELTA Pro's 45kg. Moving the core unit (without batteries) is far easier, though the B300 batteries are 50kg each.
Which Should You Buy?
Buy the EcoFlow DELTA Pro if: you're setting up home backup and want a complete, functional system without component purchasing complexity, you need the highest AC output in this class (3600W/7200W surge), you want Smart Home Panel integration for automatic circuit switching, or you're starting with one unit and might expand later but don't need to commit to a large battery array upfront.
Buy the Bluetti AC300 system if: you're building a large-scale off-grid installation where 2400W of solar input matters, you want battery modularity for long-term maintenance and replacement, you're committing to a 6000-12,000Wh system from the start and the per-Wh cost at scale is more competitive, or your maximum AC load is under 3000W and the AC300's output is sufficient.
For more on home backup sizing and setup, see our best solar generators for home backup guide, and the full EcoFlow DELTA Pro review.
Frequently Asked Questions
Is EcoFlow DELTA Pro or Bluetti AC300 better for home backup?
The EcoFlow DELTA Pro is better for most home backup buyers. It's a complete 3600Wh system at $2,699, while the Bluetti AC300 requires purchasing a separate B300 battery (~$2,099) to function — making entry cost approximately $4,400 for less initial capacity (3072Wh). The DELTA Pro also has higher AC output (3600W vs 3000W) and Smart Home Panel integration.
How much does Bluetti AC300 cost with batteries?
The Bluetti AC300 unit costs approximately $2,299, but it requires at least one B300 battery module (~$2,099) to function. The entry-level system (AC300 + 1x B300) costs approximately $4,400 for 3072Wh of capacity. Adding additional B300 batteries brings total capacity to 6144Wh ($6,497), 9216Wh ($8,596), or 12,288Wh ($10,695).
How much solar can the EcoFlow DELTA Pro accept?
The EcoFlow DELTA Pro accepts up to 1600W of solar input via its dual MPPT charge controller. With four 400W panels, you can potentially recharge the full 3600Wh battery in approximately 2.5-3 hours of peak sunlight. The Bluetti AC300 accepts 2400W of solar — 50% more — which is a meaningful advantage in off-grid installations with large panel arrays.
Can the EcoFlow DELTA Pro run a whole house?
The DELTA Pro can power selected essential circuits in a home — refrigerator, lights, outlets, CPAP — but not a whole house simultaneously. It cannot run central HVAC (typically 3,500-5,000W), electric range (5,000-8,000W), or electric water heater simultaneously. Paired with the EcoFlow Smart Home Panel, it provides automatic backup for designated essential circuits.
What is the EcoFlow Smart Home Panel and does Bluetti have one?
EcoFlow's Smart Home Panel connects DELTA Pro units directly to a home's electrical panel, enabling automatic circuit-level backup switching when grid power fails. Specific circuits can be designated for backup power, and the system switches automatically without a manual transfer switch. Bluetti does not have an equivalent product in their AC300 ecosystem.
How long will EcoFlow DELTA Pro power a refrigerator?
A standard full-size refrigerator draws 100-150W on average. Using the runtime formula (3600Wh × 0.85 ÷ 130W average), the DELTA Pro provides approximately 23.5 hours of refrigerator runtime from a full charge. Adding solar recharging during the day can extend that indefinitely through shorter outages.
Can the Bluetti AC300 be used without a battery?
No. The Bluetti AC300 is a modular inverter unit with no built-in battery — it requires at least one B300 battery module to function at all. This distinguishes it from units like the EcoFlow DELTA Pro, which is a complete, self-contained unit. The modular design is intentional for scalability, but it adds cost and complexity at the entry level.
Which has more AC output: EcoFlow DELTA Pro or Bluetti AC300?
The EcoFlow DELTA Pro outputs 3600W continuous with a 7200W surge — the higher spec in this comparison. The Bluetti AC300 outputs 3000W continuous with a 6000W surge. The DELTA Pro's 3600W can handle loads that the AC300's 3000W cannot, including some central air conditioner units and dual-element electric stoves.
