Bluetti Apex 300 vs EcoFlow DELTA Pro Ultra: Whole-Home Backup at Very Different Prices
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The Bluetti Apex 300 is the better choice for most buyers needing whole-home backup. At $3,999 versus $5,999, the Apex 300 delivers native 240V output and 3000W AC for $2,000 less than the DELTA Pro Ultra. The EcoFlow DELTA Pro Ultra earns its premium only when you need its 7200W output ceiling, 5600W solar input, or plan to build a system beyond 20kWh. For most households, that ceiling is unnecessary.
Quick Specs Comparison
| Spec | Bluetti Apex 300 | EcoFlow DELTA Pro Ultra |
|---|---|---|
| Capacity | Expandable (sold as expandable system) | 6144Wh base |
| AC Output | 3000W | 7200W |
| Surge | Not rated separately | 10800W |
| Solar Input | 3000W | 5600W |
| 240V Output | Yes (native) | Yes (native) |
| Expandable | Yes (to 58kWh) | Yes (to ~36kW system) |
| Weight | ~45kg (est.) | 99kg |
| Battery | LiFePO4 | LiFePO4 |
| Price | ~$3,999 | ~$5,999 |
Understanding the Capacity Numbers: kW vs kWh
Before comparing these units, a critical clarification: EcoFlow markets the DELTA Pro Ultra system with a "36kW" figure, while Bluetti quotes "58kWh" for the Apex 300 expansion ceiling. These measure different things. Kilowatts (kW) is a power rating — how much electricity flows at once. Kilowatt-hours (kWh) is an energy rating — how much total energy is stored. You cannot directly compare them.
The EcoFlow DELTA Pro Ultra base unit stores 6144Wh (6.1kWh) of energy. The Bluetti Apex 300 expanded to 58kWh stores 58,000Wh of energy. On stored capacity, Bluetti's expansion ceiling is substantially larger. The EcoFlow's "36kW" refers to the maximum power delivery of a fully configured multi-unit system — not stored capacity. Both companies use marketing figures that can mislead; read the fine print before buying.
Bluetti Apex 300 Overview
The Apex 300 is Bluetti's most capable home backup system, featuring simultaneous 240V and 120V output — a genuine differentiator. Most solar generators require two units paired together to generate 240V. The Apex 300 does it natively from a single box. This means you can run a central air conditioner, an electric clothes dryer, or a well pump directly from the Apex 300 without a second unit or complex wiring.
The 3000W solar input ceiling is strong for a unit at this price. With ten 300W panels, you can recharge 3000W of capacity per hour — meaningful for a system designed for extended whole-home use. Bluetti's expansion path to 58kWh is the industry's most generous, using stackable battery modules that integrate cleanly with the Apex 300's management system.
At $3,999, the Apex 300 is not cheap. But compared to home battery systems like the Tesla Powerwall 3 ($9,200+ installed) or LG RESU, it offers more flexibility and a lower entry cost for buyers willing to self-install or use a certified installer.
EcoFlow DELTA Pro Ultra Overview
The DELTA Pro Ultra is the most powerful single-unit solar generator EcoFlow has ever built. The 7200W continuous AC output is genuinely useful for whole-home scenarios where you're running central HVAC, a well pump, and standard household loads simultaneously. The 10800W surge output handles even the most demanding motor startups cleanly.
At 99kg, the DELTA Pro Ultra is not a portable unit. It requires permanent or semi-permanent installation, typically in a garage or utility room. The 5600W solar input is the highest in its class — with a large roof or ground-mount array, it can recharge 5.6kW of capacity every hour of peak sun. For buyers who want true energy independence during multi-day outages, that solar throughput matters.
The $5,999 price covers the base unit only. Expansion batteries add significantly to the total cost. EcoFlow's ecosystem around the Pro Ultra is still developing, and some advanced features that work seamlessly on the DELTA Pro (like Smart Home Panel integration) are still being refined for the Ultra. Read our EcoFlow DELTA Pro Ultra review for a full assessment.
Where the Bluetti Apex 300 Wins
- $2,000 cheaper — $3,999 vs $5,999 for native 240V whole-home backup capability
- Native 240V from a single unit — no second unit required; EcoFlow also offers this on the Ultra
- Larger capacity expansion ceiling — 58kWh vs EcoFlow's more limited expansion path at this price
- Much lighter — ~45kg estimate vs 99kg for the Ultra; significantly easier to position and install
- Better value per dollar — most buyers never need 7200W output; Apex 300's 3000W handles typical homes
Where the EcoFlow DELTA Pro Ultra Wins
- 7200W continuous AC — handles larger whole-home loads that exceed the Apex 300's 3000W ceiling
- 10800W surge — the highest surge output in the consumer market; handles any residential motor
- 5600W solar input — nearly double the Apex 300's 3000W solar ceiling
- 6144Wh base capacity — double a typical competitor's base; substantial even before expansion
- Best-in-class solar throughput — for buyers with large solar arrays, the Ultra maximizes harvest
Price and Value
The $2,000 price gap is the decisive factor for most buyers. The Apex 300 at $3,999 delivers the core capability most homeowners need: native 240V, enough output to run critical circuits, and a massive expansion path. The DELTA Pro Ultra's additional power and solar input are genuinely useful — but for a typical 1,500-2,500 sq ft home backing up essentials, 3000W and 3000W solar is sufficient.
Where the Ultra justifies its price: large homes with central HVAC (needs 240V and 3000W+ for the compressor), well pumps (240V, often 3-5hp), or buyers who want to go fully off-grid with a large solar array. For typical home backup covering a refrigerator, lighting, and device charging through an outage, $2,000 more is not justified.
Which Should You Buy?
Buy the Bluetti Apex 300 if: you need native 240V output for a whole-home backup, want the highest capacity expansion ceiling in the market, or are budget-conscious. The $2,000 savings buys two extra battery modules. For most households running essential circuits during outages, the Apex 300 is more than sufficient.
Buy the EcoFlow DELTA Pro Ultra if: you have a large home with high power demands (central HVAC above 3 tons, multiple high-draw appliances), want the fastest solar recharge available, or are building a serious off-grid energy system where 7200W output and 5600W solar input are regularly used. Also the right call if EcoFlow's ecosystem integration matters for your installation.
Check Bluetti Apex 300 price on Amazon
Check EcoFlow DELTA Pro Ultra price on Amazon
Also see our best high-capacity solar generators guide and the full EcoFlow DELTA Pro Ultra review.
Frequently Asked Questions
Does the Bluetti Apex 300 output true 240V?
Yes. The Apex 300 outputs native 240V and 120V simultaneously from a single unit — one of its key differentiators. You can run both 240V appliances (dryers, central AC compressors, well pumps) and standard 120V outlets at the same time without pairing two units or using a step-up transformer.
What does EcoFlow mean by a 36kW system for the DELTA Pro Ultra?
EcoFlow's 36kW figure refers to the maximum power output capacity of a fully configured multi-unit DELTA Pro Ultra system — not stored energy. The base unit stores 6144Wh (6.1kWh) of energy. The 36kW describes how fast the full system can deliver power, not how much total energy it holds. This is a common marketing distinction worth understanding before purchase.
How long will the Bluetti Apex 300 power a central air conditioner?
A typical 2-ton central AC draws about 2,500W running and 7,500W+ at startup. The Apex 300's 3000W output can sustain the running load, but the startup surge is a concern without a soft starter. With a soft starter installed on the AC unit, expect 1-2 hours of runtime from the base battery configuration before needing a recharge or additional battery modules.
Is the EcoFlow DELTA Pro Ultra too heavy to move?
At 99kg (218 lbs), yes — the Ultra requires two people and ideally a hand truck or furniture dolly for any repositioning. It is not a unit you carry in and out of a vehicle. It is designed for permanent or semi-permanent installation in a garage, utility room, or basement. EcoFlow sells a wheeled cart accessory to make indoor movement easier.
Can the Bluetti Apex 300 be expanded to 58kWh?
Yes. Bluetti's modular battery expansion system allows stacking battery modules to reach 58kWh total. Each expansion module adds substantial capacity. The 58kWh ceiling is by far the largest expansion path available in the portable/semi-portable solar generator market. At typical home consumption of 30kWh per day, a fully expanded Apex 300 system could theoretically run a house for nearly two days.
Which unit is better for off-grid living, the Apex 300 or DELTA Pro Ultra?
The EcoFlow DELTA Pro Ultra has an edge for serious off-grid use: 5600W solar input means faster daily recharging from panels, and 7200W output covers larger loads. However, the Bluetti Apex 300's 58kWh expansion ceiling stores more total energy — critical for multi-day low-sun periods. Serious off-grid buyers typically run both high solar input and high capacity; on paper, the Ultra's solar input plus Apex 300's capacity ceiling would be the ideal combination.
What whole-home circuits can a 3000W solar generator back up?
A 3000W unit like the Bluetti Apex 300 can simultaneously run: a refrigerator (150W), LED lighting throughout the house (100W), phone and laptop charging (200W), a small window AC (500W), and a microwave at intervals (1000W). The total at 950W continuous leaves significant headroom within the 3000W ceiling. It cannot run central HVAC, electric water heaters, or electric ranges simultaneously.
