Anker built its name on portable power stations, but the SOLIX X1 is a different animal entirely: a permanently installed, wall- or ground-mounted home battery system aimed squarely at Tesla Powerwall 3 territory. It launched into a crowded field in 2026, and the pitch is aggressive modularity — scale from a single small unit up to a genuine whole-home backup system without swapping hardware. Here’s what the X1 actually offers and where it fits against the established players.
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What the X1 actually is
The X1 is a LiFePO4 (LFP) battery system sold as individual modules rated 10, 15, or 20 kWh of nominal capacity each. Anker’s own spec sheet lists a scalable range from roughly 5 kWh up to 180 kWh by combining up to 6 battery modules per system and running up to 6 systems in parallel — well beyond what a single household needs, but useful context for how seriously Anker is positioning this as commercial-capable hardware, not just a residential add-on. Anker states “0 energy loss while expanding capacity,” meaning adding a module later doesn’t degrade the performance of what’s already installed.
Power output and backup performance
A single module delivers up to 6 kW continuous and 12 kW peak power — strong numbers for a single unit, enough to start a well pump or AC compressor without derating. On-grid output scales from 3 kW up to 36 kW across a fully built system. Anker advertises a sub-20-millisecond switch time to backup power during an outage, in the same range as Tesla’s Powerwall 3 and other modern all-in-one systems, and a “Storm Guard” mode that automatically tops off the battery when severe weather is forecast — a feature that’s become table stakes across this category rather than a genuine differentiator.
Chemistry, safety, and operating range
LiFePO4 chemistry is the safer, more thermally stable choice compared to older NMC lithium batteries, and Anker states thermal runaway resistance in the 572°F–662°F range. The system carries an IP65 dust and water resistance rating for outdoor mounting and is rated to maintain full output across a wide -4°F to 131°F ambient range — worth comparing against your own installer’s real-world experience if you’re in a climate that regularly hits either extreme; see our guide on home batteries in hot climates for why manufacturer spec sheets don’t always match garage reality.
Efficiency and warranty
Anker rates round-trip efficiency at up to 90.2%, in line with the rest of the modern LFP field — a few points below the best-in-class numbers some rivals claim, but not a meaningful real-world difference for most households. The warranty is a straightforward 10-year limited coverage, matching the industry-standard term rather than beating it.
What Anker doesn’t publish yet
The X1’s biggest weak spot on paper isn’t performance, it’s transparency. Anker publishes nominal capacity (10/15/20 kWh per module) but not usable capacity or depth-of-discharge figures — details competitors like Tesla and Franklin publish plainly. Pricing is also still not listed publicly as of this writing; Anker’s marketing language points at being “competitive” with established brands, which in practice has meant financing promotions and dealer-quoted pricing rather than a fixed sticker price. Budget for a real quote before assuming any specific number, and treat early online price estimates as guesses until your installer gives you a firm figure.
How it stacks up against Tesla Powerwall 3
The X1’s advantage over Powerwall 3 is flexibility: modular capacity in 10/15/20 kWh increments versus Powerwall 3’s fixed 13.5 kWh unit, and a higher peak power ceiling per module. Tesla’s advantage is a much longer track record, a mature installer network, transparent published specs including usable capacity, and app/ecosystem polish that’s been refined over multiple hardware generations. See our full Tesla Powerwall 3 review for the comparison point, and our best home battery systems ranked guide for how the X1 fits into the broader field.
Who the X1 makes sense for
The X1 is a reasonable fit for a household that wants meaningfully more backup capacity than a single Powerwall provides and wants to size that capacity in stages rather than committing to a huge system on day one. It’s a harder sell if you value a fully transparent spec sheet and an installer network with years of field history behind it — Anker is still building both. If you already own Anker’s portable SOLIX F3800 power station, note that the X1 is a separate, professionally installed product line and not an expansion battery for the F3800 itself; see our Anker SOLIX F3800 review if you’re actually looking at the portable side of Anker’s lineup, and consider Anker SOLIX expansion accessories on Amazon if you’re building out the portable ecosystem rather than the installed X1 system.
Installation requirements and total cost picture
Unlike Anker’s portable power stations, the X1 requires professional installation — it ties directly into your home’s electrical panel and, in most jurisdictions, needs a permit and inspection just like any other permanently installed battery system. Budget for labor and permitting on top of whatever hardware price your installer quotes, and don’t assume Anker’s eventual published pricing will be the final number you pay. Our 2026 whole-home battery cost guide breaks down what labor and permitting typically add on top of equipment costs across brands, which is useful context even before Anker finalizes X1 pricing specifically. As with any new entrant, run your own return-on-investment math once you have a real quote rather than assuming a newer brand automatically means a better deal — our home battery ROI guide walks through the actual value streams worth calculating.
Questions to ask your installer
- What is the usable (not nominal) capacity per module after accounting for depth-of-discharge limits?
- What’s the actual installed price per module in my area, including labor and permitting?
- How many X1 installations has this specific installer completed, and can they show a system running through a real outage?
- What happens to my warranty and support if Anker changes its installer network or support structure in the next few years?
Bottom Line
The Anker SOLIX X1 is a legitimate, well-specified challenger to Tesla Powerwall 3 with genuinely strong peak power and flexible modular scaling, but it’s a newer product from a company still building out its residential installer network and hasn’t yet published the usable-capacity numbers a fully informed buyer needs. If modularity and peak power matter more to you than a long track record, it’s worth a serious look and a real quote — just weigh it against our full rankings before committing, since “newest” and “best fit for your house” aren’t always the same thing.
John Farmer is a veteran and the founder of Veteran Forge Strategies LLC. He researches home battery backup, solar, and energy storage to help homeowners make confident decisions about energy resilience and lower power bills, and writes Home Power Vault to make backup power simple to understand.
