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EcoFlow Delta Pro 3 vs Bluetti AC300+B300: Which Wins for Home Backup?

The short answer: For most homeowners buying a single unit to cover essential circuits during a multi-day outage, the EcoFlow Delta Pro 3 is the stronger choice — more capacity, more output power, significantly faster charging, and a better app. The Bluetti AC300+B300 makes a genuine case if you want a modular system you can add batteries to over time or if you prefer separate inverter and battery modules you can position independently. One other thing worth knowing upfront: Bluetti appears to be phasing out the AC300 line in favour of newer products — availability has been intermittent through 2026. That doesn’t make existing units worse, but it’s a factor for long-term support.

Quick Comparison

EcoFlow Delta Pro 3 — Overview

The Delta Pro 3 is EcoFlow’s current flagship portable power station — a single integrated unit with 4,096Wh of capacity, 4,000W of AC output, and a charging system that takes the battery from zero to 80% in roughly 50 minutes from a standard wall outlet. It handles 120V and 240V output (not simultaneously, but switchable via the app), which covers well pumps, sump pumps, and other 240V appliances. It expands with add-on batteries up to 48kWh and integrates with EcoFlow’s Smart Home Panel 2 for automatic circuit-level backup.

Check current price on EcoFlow →

Bluetti AC300+B300 — Overview

The Bluetti AC300 is a modular inverter — it has no battery of its own and requires at least one B300 battery module to operate. The B300 holds 3,072Wh of LFP capacity with 3,500+ rated cycles. Together they form a 3,072Wh / 3,000W system that supports up to four B300 modules for up to 12,288Wh of storage. The modular design means the inverter and battery are two separate pieces you can position or carry independently, which has practical advantages in specific installations. The AC300 line has been in the market since 2022 and Bluetti appears to be transitioning buyers toward newer products; stock has been intermittent through early 2026.

Check current price on Bluetti →

Head-to-Head: What Actually Matters for Home Backup

Capacity and Runtime

The Delta Pro 3 has 33% more capacity than the AC300+1×B300: 4,096Wh vs. 3,072Wh. In runtime terms, a full-size refrigerator at 150W runs for 23.2 hours on the Delta Pro 3 and 17.4 hours on the Bluetti system. Running a fridge and a CPAP together at 190W: 18.3 hours on the Delta Pro 3 vs. 13.7 hours on the Bluetti. Both cover a full overnight outage on that load — the Delta Pro 3 does it with more reserve.

Where the difference gets more meaningful is multi-day outages. With a single charge and no solar supplementation, the Delta Pro 3 handles roughly 23 hours of fridge-only runtime; the Bluetti manages 17. Both benefit from solar recharging to extend coverage, but the Delta Pro 3 starts with a bigger tank. For a 76-hour outage — the kind that pushes homeowners from “thinking about backup power” to “buying backup power” — the Delta Pro 3 covers the first day comfortably and relies on solar for the rest. The Bluetti covers less of that first day unassisted.

If you want to match the Bluetti to the Delta Pro 3’s capacity, you need to add a second B300 battery ($799–$999 each), bringing the total system cost to roughly $3,000–$3,200 at 6,144Wh. That’s more expensive than the Delta Pro 3 at sale price.

Price and Value

At typical sale prices, these units are surprisingly close: the Delta Pro 3 runs ~$2,099–$2,299, and the Bluetti AC300+1×B300 bundle runs ~$2,299. At those prices, the Delta Pro 3 offers more capacity, more power, and faster charging for essentially the same money. The value comparison favors EcoFlow clearly.

The Bluetti makes a stronger price argument when you’re specifically planning to add multiple battery modules over time. If your goal is 6,144Wh or 9,216Wh of storage, the AC300’s inverter + batteries approach lets you spread the cost — buy the AC300+B300 now, add a second B300 six months later. The Delta Pro 3 expands too, but you’re buying one more complete unit rather than a purpose-built modular battery. Whether that flexibility is worth the trade-offs on performance specs depends on how you’re budgeting the build.

Expandability

Both systems expand significantly, but the architecture is different.

The Delta Pro 3 uses EcoFlow’s proprietary extra batteries, scaling up to 48kWh in a single system. EcoFlow is an active, growing company with a full product roadmap — expansion battery availability and compatibility should remain solid.

The Bluetti AC300 accepts up to 4×B300 modules for 12,288Wh — a genuinely impressive ceiling for a modular system. The concern is that Bluetti appears to be winding down the AC300 line in favour of the newer Apex 300 product. How long B300 batteries remain available at retail, and how long firmware support continues for the AC300 inverter, is an open question. This doesn’t make current AC300 systems bad, but it’s a legitimate long-term consideration if expandability over many years is part of your plan.

Charging Speed

This is where the Delta Pro 3 has its clearest advantage. From a standard 120V wall outlet:

• Delta Pro 3: 0–80% in approximately 50 minutes; 0–100% in 1.5–2.5 hours
• Bluetti AC300+B300: 0–80% in approximately 2–3 hours; 0–100% in 4–5 hours

In a real outage scenario, charging speed matters when the grid comes back briefly before going out again. If power returns for two hours, the Delta Pro 3 goes from near-empty to 80% charged and ready for the next outage. The Bluetti refills to roughly 40–50% in the same window. For most homeowners who are charging once after each outage, the difference is academic. For anyone in an area where power flickers on and off during a storm — grid restoration followed by another outage — the Delta Pro 3’s charging speed is a meaningful operational advantage.

Setup and Portability

The Delta Pro 3 is one piece: 113 lbs with wheels and a handle. You roll it into position, plug it in, and leave it. Moving it requires the wheels to be on a smooth surface.

The Bluetti AC300+B300 is two pieces: the AC300 inverter at 47.6 lbs and the B300 battery at 79.6 lbs. That’s a total of 127 lbs when they’re connected, but you can carry or move each piece separately — and at 47.6 lbs, the AC300 inverter is manageable for one person. If your installation involves tight spaces, stairs, or a situation where you need to position the battery independently from the inverter, the modular design has real practical advantages. For a straightforward garage-or-basement placement, the Delta Pro 3’s single-unit design is simpler.

The Silence Factor

Both units run quietly at home backup loads. At a combined fridge + CPAP load of 190W, neither the Delta Pro 3 nor the AC300+B300 produces noticeable fan noise — thermal management at that draw is minimal on both systems. Under heavy load (2,000W+), both units engage their cooling fans more actively and produce audible noise — neither has a clear advantage here. For the primary home backup use case, where typical loads stay well under 1,000W, both systems are quiet enough that you’d forget they’re running.

Who Should Buy the EcoFlow Delta Pro 3

• Homeowners who want the most capacity and output in a single integrated unit
• Anyone whose outages run 24–72 hours and who needs fridge, CPAP, freezer, and lights covered without counting watts
• Buyers who need fast recharging — the 50-minute 0–80% charge is a significant operational advantage
• Homes with well pumps or sump pumps requiring high starting surge (8,000W vs. 6,000W)
• Anyone who wants a clear, active product roadmap for expansion and accessories
• Buyers who will use the EcoFlow app for monitoring and scheduling (better-reviewed than Bluetti’s app)

Who Should Buy the Bluetti AC300+B300

• Buyers who specifically want a modular system and plan to add B300 batteries incrementally over time
• Installations where positioning the inverter and battery independently is practically useful
• Buyers who find an AC300+B300 bundle at a significantly lower price than the Delta Pro 3 (it happens during sales)
• Buyers who have already invested in Bluetti’s product line and want to expand within it
• Anyone who priorities the slightly higher cycle rating (3,500+ vs. 3,000+) — though in a realistic home backup scenario, both batteries will outlast the rest of the equipment

Our Pick

For most homeowners choosing between these two systems for home backup, the EcoFlow Delta Pro 3 is the right call. More capacity, more power, dramatically faster charging, and an active product line — at sale prices that are equal to or lower than the Bluetti bundle. The math is clear enough that we wouldn’t send a neighbour to the Bluetti unless they had a specific reason: a planned multi-battery modular expansion, an installation where the separate-unit design solves a practical problem, or a deal that meaningfully undercuts the Delta Pro 3’s sale price.

The Bluetti AC300+B300 is a capable system, not a bad one. If you’re already committed to Bluetti or you find a deep discount, it does the home backup job. But if you’re deciding from scratch at similar price points, the Delta Pro 3 is the stronger product on the specs that matter most for this use case.

If you’re still weighing options across the full range — from the entry-level Delta 2 to the whole-home Delta Pro Ultra X — our full comparison covers all three: Best Portable Power Station for Home Backup.

Check current price on the Delta Pro 3 →

Frequently Asked Questions

Can the Bluetti AC300 run without the B300 battery? No — the AC300 is an inverter module with no internal battery. It requires at least one B300 (or B300K) battery module connected to operate. This is the key structural difference from the Delta Pro 3, which is a complete standalone unit. If you buy the AC300 alone, it cannot power anything until a battery module is connected.

Does the Bluetti AC300 support 240V output? Yes, but it requires a specific configuration — connecting two AC300 units in split-phase mode. A single AC300+B300 running on its own outputs 120V. To get 240V from a single Bluetti system, you need the fusion box and a dual-unit setup, which roughly doubles the cost. The Delta Pro 3 switches between 120V and 240V modes as a single unit, which is simpler for most homeowners. If 240V is a priority and budget is a factor, this is a meaningful comparison point.

Is the Bluetti AC300 still being sold and supported? The AC300 line has seen intermittent availability through early 2026, and Bluetti appears to be transitioning its product line toward newer systems like the Apex 300. Existing AC300 units are not discontinued and Bluetti has committed to ongoing support, but expansion battery availability may tighten over time. If long-term expandability is a priority, the Delta Pro 3’s active product roadmap is a more confident bet.

Which has better customer service — EcoFlow or Bluetti? Both companies have mixed reputations in owner communities. EcoFlow’s app and firmware update process are generally better-reviewed. Bluetti’s customer service response times have drawn both praise and criticism depending on the issue. Neither brand has a clean record — warranty returns for both require patience, particularly given lithium battery HazMat shipping requirements. For straightforward defects under warranty, both companies resolve the issue; the process just takes time.