Anker Solix X1: Specs, Price, and How It Compares for Whole-Home Backup
Most home batteries come in one fixed size, and you're stuck with whatever you bought on day one. The Anker Solix X1 doesn't work that way. It's built as a modular system from the start, beginning with a single 5kWh module and scaling all the way up to 180kWh across multiple paralleled systems. This guide breaks down its full specs, what it actually costs to install in the US, what reviewers are saying about it, and how it stacks up against EcoFlow's DELTA Pro Ultra and DELTA Pro Ultra X for anyone weighing their whole-home battery options.
Anker Solix X1 Specs
The X1 is built around flexibility more than any single headline number. Before comparing it to anything else, it helps to know exactly what you're working with.
Spec | Anker Solix X1 |
Capacity range | 5 to 180 kWh (modular, 1 to 6 modules per system, up to 6 systems paralleled) |
Output range | 3 to 36 kW |
Battery chemistry | LFP |
Cycle life | 3,300 full cycles per 5kWh module |
Round-trip efficiency | Up to 90.2% |
Backup switchover | Under 20ms |
Coupling | AC-coupled (requires a separate solar inverter) |
Warranty | 10 years |
Weight | 389 lbs (single power module) |
A few things stand out once you get past the spec sheet:
The X1 is AC-coupled, meaning it connects alongside an existing solar inverter instead of including one. That's a good fit if you're retrofitting battery storage onto solar you already have, but it makes for a more complex bundle if you're starting from scratch.
A 10-year warranty is a long stretch compared to the 5-year terms you'll see on most portable-to-whole-home hybrid units. That said, it reflects a genuinely different category of product. A fixed-install home battery and a movable power station aren't really built to the same standard, and it's worth understanding that difference before comparing warranty terms head to head, something what makes a home backup system different from a portable one gets into in more detail.
The app includes self-consumption, time-of-use optimization, and off-grid modes, plus a dedicated mode built around California's net billing rules. That last one matters if you're on the state's current solar compensation structure, which the California Public Utilities Commission now governs under its Net Billing Tariff rather than the old NEM 2.0 framework.
Specs this modular only mean so much on paper. What matters more is what a real installed system actually costs.
Anker Solix X1 Price and Cost Breakdown
Modular pricing sounds simple until you start adding up the pieces. Here's roughly what you're looking at for a typical setup.
A 15kWh system runs about $9,750 before installation, which works out to roughly $650 per kWh of capacity. That's competitive with other AC-coupled home batteries, though not dramatically cheaper than the field.
Installation typically adds another $1,500 to $5,000 or more, depending on how much electrical panel work is involved and what labor costs in your area. That range holds true for home battery installs generally, not just this product.
Because the X1 skips the built-in inverter, a new solar-plus-battery install needs to budget for one separately. That's a real gap compared to bundled systems, and it's the same kind of cost-stacking issue that shows up when homeowners try to nail down what a full solar and storage setup actually runs before signing a contract.
Add it all up, and a mid-size X1 install can land anywhere from around $11,000 to well over $20,000 once inverter costs and labor are factored in. The final number depends a lot on your home's existing wiring and how much capacity you're aiming for.
With cost on the table, the more useful question for most homeowners is how the X1 stacks up against EcoFlow's own whole-home lineup.
How the Anker Solix X1 Compares to EcoFlow's DELTA Pro Ultra Lineup
The X1 and EcoFlow's DELTA Pro Ultra family solve the same problem in different ways. One assumes you already have an inverter. The other doesn't make you find one.
Spec | Anker Solix X1 | EcoFlow DELTA Pro Ultra | EcoFlow DELTA Pro Ultra X |
Base capacity | 5kWh per module | 6.14kWh | 12kWh |
Max expansion | 180kWh | 90kWh | 180kWh |
Output | 3 to 36 kW | 7.2kW continuous, 10.8kW surge | 12kW continuous, up to 36kW (3 units) |
Inverter included | No (AC-coupled) | Yes | Yes |
Smart panel pairing | N/A | Smart Home Panel 2 | Smart Home Panel 3 |
Starting price | ~$9,750 (15kWh, pre-install) | ~$4,199 (inverter + 1 battery) | ~$7,999 (inverter + 2 batteries) |
A few things worth pulling out of that table:
The X1's separate-inverter design and long warranty put it closer to a traditional fixed-install home battery, the kind homeowners retrofit onto solar that's already on the roof. DPU and DPUX bundle the inverter in, so they cover both portable and stationary use out of the box.
DPUX's 12kW single-unit output makes it the closer match for the X1's higher-output configurations, and it works alongside a system built to sync power distribution across the panel in real time, the way EcoFlow's smart home energy management setup does for whole-house circuits. Standard DPU covers a more modest single-unit capacity at a lower entry price.
Installation complexity is a real difference too. The X1 needs a separate solar inverter coordinated into the install, while DPU and DPUX are built to go in as more turnkey whole-home systems.
Specs and pricing tell part of the story. It's worth knowing what people actually running the X1 have to say about it.
What Reviewers Say About the Anker Solix X1
Reviews on the X1 have been fairly consistent since it started shipping. A few themes keep showing up.
Reviewers generally call the X1's modularity and per-kWh pricing competitive within the home battery category. That's especially true for homeowners who want to scale up capacity over time instead of buying everything up front.
The AC-coupled design gets flagged again and again as the deciding factor. It's a strong fit if you're adding storage to solar you already have, but it's less convenient than an inverter-included system if you're building from scratch.
The 10-year warranty and up to 90.2% round-trip efficiency come up favorably in side-by-side comparisons against other major home battery brands.
Backup power in general has gotten more attention lately, and for good reason. Hurricanes drove US customers to their longest stretch without power in a decade during 2024, according to the Energy Information Administration. That kind of outage risk is a big part of why modular, scalable batteries like the X1 have found an audience beyond just early adopters.
Conclusion
The Anker Solix X1 is a modular, AC-coupled home battery that scales from 5kWh to 180kWh, backed by a 10-year warranty and priced around $650 per kWh before installation. It's a solid pick if you already have solar and just need more storage behind it. If you'd rather have the inverter bundled in from the start, at a lower entry price, EcoFlow's DELTA Pro Ultra and DELTA Pro Ultra X are worth comparing against the X1's installed cost.
FAQs
What are the full specs of the Anker Solix X1?
It's a modular home battery with a capacity range of 5 to 180 kWh, output from 3 to 36 kW, LFP chemistry, and a 10-year warranty. It's AC-coupled, so it needs a separate solar inverter rather than including one.
How much does the Anker Solix X1 cost in the US?
A 15kWh system runs roughly $9,750 before installation, or about $650 per kWh. Installation typically adds another $1,500 to $5,000 or more, depending on your electrical setup and local labor rates.
Is the Anker Solix X1 a good fit for an existing solar system?
Yes, if you already have a solar inverter installed. The X1's AC-coupled design is built for retrofitting storage onto existing solar, including a dedicated mode for California homeowners navigating net billing, a topic covered in more detail in what NEM 3.0 actually means for your solar bill. It's a less natural fit for a brand-new solar-plus-battery install, where an inverter-included system like DELTA Pro Ultra saves a step.
How does the Anker Solix X1 compare to EcoFlow's DELTA Pro Ultra lineup?
Both scale to serious whole-home capacity, but DPU and DPUX include the inverter and are designed as turnkey systems, while the X1 requires a separate inverter. DPUX's 12kW output is the closer match to the X1's higher-end configurations.
How long is the warranty on the Anker Solix X1?
Ten years, which is longer than the 5-year terms typical of portable-to-whole-home hybrid units like DPU and DPUX. That gap reflects the different product categories more than a difference in build quality.
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