SolaX vs Solis: Budget Hybrid Inverters Compared for UK Homes

Why these two brands end up in the same conversation

When UK homeowners and installers look beyond the GivEnergy premium tier, SolaX and Solis are the names that consistently appear side by side. Both are Chinese manufacturers with large global install bases. Both target the budget-to-mid-range residential market. Both work with Pylontech batteries. And both offer the core hybrid inverter functionality — solar input, battery management, grid connection, and time-of-use scheduling — at prices meaningfully below GivEnergy or SunSynk.

The question is not whether either brand is "good enough." The question is which one fits your specific installation priorities better. This article works through the meaningful differences so you can make that call.

The models in focus

For most UK residential installations, the relevant comparison is:

• SolaX X1-Hybrid G4 — single-phase hybrid, available in 3kW, 5kW, and 6kW
• Solis S6-EH1P — single-phase hybrid, available in 3kW, 3.6kW, 4.6kW, 5kW, and 6kW

Both are fifth- or sixth-generation models from their respective manufacturers and represent the current mainstream single-phase hybrid offering for UK residential use.

Specifications side by side

Battery compatibility — the shared Pylontech advantage

One of the most practical things both brands have in common is native support for Pylontech batteries. Pylontech is by far the most widely stocked third-party residential battery brand in the UK installer market. Both the X1-Hybrid G4 and the S6-EH1P communicate with Pylontech units over CAN bus, which means your battery choice is not dictated by which inverter you select.

This is meaningfully different from GivEnergy, which ties you to its own battery ecosystem. With either SolaX or Solis, you can shop around for battery pricing independently of your inverter. If your installer already holds Pylontech stock, or if Pylontech pricing is more competitive at the time of your installation, you have that flexibility.

SolaX also offers its own T-BAT H 5.8 batteries (LFP, stackable to 17.4kWh) if you prefer a single-manufacturer approach. Solis does not manufacture its own batteries — a design choice that keeps their focus on inverter hardware but means you always need a separate battery sourcing decision.

EPS backup — a genuine differentiator

EPS (Emergency Power Supply, or backup power during a grid outage) is where the two brands differ most clearly in the base specification.

SolaX X1-Hybrid G4 includes EPS capability as standard. During a grid outage, the inverter switches to backup mode in approximately 10ms. Designated circuits keep running from solar and battery without any additional hardware.

Solis S6-EH1P requires an external ATS (Automatic Transfer Switch) to achieve the same result. The ATS typically adds £200–£400 to the installed cost, and your installer needs to wire it in separately. If you do not specify EPS at installation time, retrofitting it later requires additional work.

If backup power during outages matters to you — even for basic essentials like a router, freezer, or phone charging — the SolaX built-in EPS is a cleaner, lower-cost path to achieving it. The Solis ATS requirement is not a dealbreaker, but it is an additional cost and installation step to factor in.

Monitoring — SolaX Cloud vs SolisCloud

Neither platform will trouble GivEnergy's monitoring portal for sophistication. Both are functional and cover the basics a typical homeowner needs.

SolisCloud is broadly considered the slightly more polished of the two — the interface is cleaner and data syncing is generally more reliable. SolaX's monitoring is held back by the WiFi pocket dongle, which is the most common complaint in SolaX user communities. The dongle can lose connectivity with routers that restart or change channels, requiring a manual power cycle to restore it.

SolaX does sell a LAN ethernet adapter that resolves most dongle issues, but it is an additional cost. Solis's hardware includes LAN connectivity as a standard option on current models, giving it an edge on monitoring reliability in real-world installs.

Home Assistant and smart tariff integration

Both brands have community-developed Home Assistant integrations, and both sit behind GivEnergy and SunSynk in the depth of that integration.

Predbat — the most capable UK tool for automated battery charging and discharging based on Agile or other variable tariffs — supports GivEnergy natively and SolaX and Solis via community-developed plugins with more limited feature sets. If you plan to run Predbat or similar, expect more setup effort with either brand compared to a GivEnergy system.

For simpler time-of-use scheduling — setting a charge window for the overnight cheap rate on Octopus Go or Intelligent Go — both brands handle this adequately through their native apps. The current Octopus Go off-peak rate of 5.5p per kWh between 00:30 and 05:30 can be targeted with either inverter's built-in scheduling without needing Home Assistant at all.

Costs

Pricing varies by installer, distributor, and timing. Approximate UK figures for 2026:

Solis is cheaper at the inverter level, but once you account for the EPS ATS unit if you want backup capability, the effective cost difference narrows. If you do not need backup power and EPS is not a priority, Solis maintains a clearer price advantage.

Warranty

This is where SolaX has a significant lead.

SolaX's 10-year standard inverter warranty is a genuine differentiator. Most competing brands at this price point — including Solis, Growatt, and Fox ESS — offer 5 years as standard. Matching SolaX's warranty coverage with a Solis system requires paying for an extended warranty, which can add £150–£300 or more to the cost.

For long-term total cost of ownership, the warranty difference deserves consideration. Inverter replacements outside warranty typically cost £800–£1,500 installed. A 10-year standard warranty removes that risk for a significant period.

Installer availability

Both brands are widely distributed through UK solar trade channels. Segen, BES, and other major distributors stock both. Any MCS-certified installer who works across multiple brands should be able to source either without difficulty.

Solis has a slightly larger global install base and has been in the UK market longer in volume terms. SolaX has been growing steadily and is well-established in the installer community. Neither is a niche product — you should have no trouble finding an installer experienced with both.

Who should choose SolaX

SolaX is worth exploring in these scenarios:

• You want built-in EPS backup without the extra cost and complexity of an external ATS unit
• Long warranty coverage matters to you — 10 years as standard is a meaningful advantage for peace of mind
• You are considering SolaX's own T-BAT batteries alongside Pylontech and want to evaluate both options
• Your installer has a strong SolaX relationship and can offer competitive pricing through their distribution channel
• Three-phase property — the X3-Hybrid G4 is a strong option in the three-phase segment

Who should choose Solis

Solis is worth exploring in these scenarios:

• Cost is the primary driver and you want the lowest upfront inverter cost from a reputable brand
• EPS is not a priority — you do not need backup power during outages, or you are happy to add the ATS at a later stage
• Monitoring reliability matters — SolisCloud and the LAN connectivity option are slightly more dependable than the SolaX dongle setup
• Your installer routinely specifies Solis and has expertise and pricing advantages with the brand
• You prefer a brand with a long global track record — Solis's parent company Ginlong Technologies is publicly listed and one of the top-five inverter manufacturers globally by volume

The honest comparison

There is no clear winner between these two brands for every homeowner. Both offer solid core hardware, Pylontech battery compatibility, and competitive pricing. The decision hinges on a small number of concrete factors.

Choose SolaX if built-in EPS and a 10-year warranty without paying extra are priorities. The WiFi dongle is an annoyance, but it is solvable with the LAN adapter.

Choose Solis if upfront cost is the primary concern and you do not need EPS — or if your installer can demonstrate a price advantage that closes the warranty gap. SolisCloud's marginally better monitoring experience is a minor bonus.

In both cases, the bigger variable is often your installer — their experience, pricing structure, and preferred supplier relationship will frequently determine which brand they quote. Ask explicitly whether either brand is available and request pricing for both. The hardware difference between a well-installed Solis system and a well-installed SolaX system is, for most households, modest.

If your budget extends further, also explore GivEnergy or Fox ESS — both offer better monitoring platforms, though at higher cost.

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