Anker SOLIX RS40P Review UK: The 800W Alternative

Anker came to the UK plug-in solar market as the third player in the government's March 2026 announcement. They brought something EcoFlow didn't: a system that maxes out the 800W UK regulatory cap.

The SOLIX RS40P undercuts EcoFlow by about £50, offers 30 per cent more capacity, and comes from a company with an excellent reputation for build quality. So why isn't everyone buying Anker instead?

Let's dig into the specs and find out.

What Is the Anker SOLIX RS40P?

The Anker SOLIX RS40P is an 800W grid-tied plug-in solar system. It comprises:

• Two 400W monocrystalline solar panels
• RS40 micro-inverter (800W capacity)
• SOLIX app-based monitoring
• Compatible with SOLIX battery modules
• UK plug (13A)
• 3–5 year inverter warranty, 25-year panel warranty

Price: Around £899 for the base kit.

Expected output (southern England): 650–850 kWh/year, or roughly £175–£230 in annual savings.

The Headline Comparison: Anker vs EcoFlow

The key tension: Anker gives you more wattage for less money, but EcoFlow has a longer inverter warranty and more proven track record in the plug-in solar space.

Confirmed Specs

Solar Panels

Two monocrystalline panels, 400W each. Anker hasn't yet published the exact manufacturer, but they typically partner with Q Cells and Jinko—both excellent panel makers.

Efficiency: Around 21–22 per cent.

Warranty: 25 years. Standard and solid.

Build: Tempered glass, aluminium frame. Should handle British weather without issue.

The 400W rating per panel is legitimate—these are substantial, high-quality panels. That's why the overall system hits 800W.

Micro-inverter

800W capacity, WiFi-enabled. Anker's RS40 inverter is designed specifically for the SOLIX ecosystem. It's a newer design than EcoFlow's micro-inverter, but the company has tested it thoroughly.

Real-world output: On a sunny summer day, both panels will generate close to 800W simultaneously. On a cloudy day, 150–300W. The inverter can export up to 800W to the grid at once—a meaningful 33 per cent boost over the EcoFlow's 600W.

Warranty: 3–5 years. This is the weak point compared to EcoFlow's 10-year inverter warranty. Anker may extend this; we'll know more as UK sales mature. For now, it's shorter than best-in-class.

Grid communication: The inverter communicates with your home's wiring to manage export safely.

Battery Compatibility

The SOLIX ecosystem is modular. Anker sells SOLIX battery modules (around £800–£1,200 per unit) that stack together. You can build a 3 kWh, 6 kWh, or 9 kWh system to suit your needs.

This is slightly more flexible than EcoFlow's fixed battery sizes, but it also means higher complexity. The SOLIX batteries are newer to market, so long-term reliability data is still accumulating.

Monitoring and App

Anker's SOLIX app is professional-grade. It shows real-time generation, daily/weekly/monthly totals, savings estimates, and battery status. Updates are regular, and the app integrates with the wider SOLIX ecosystem.

The app is solid, though it lacks the polish of EcoFlow's, which has had more time to mature. Nothing wrong with it—it's just not quite as slick.

The Plug Question

Unlike the EcoFlow, the SOLIX RS40P comes with a UK 13A plug. No adapter needed. This is a genuine advantage—one less thing to worry about.

Anker's Track Record

Anker is a global consumer electronics giant. They've shipped hundreds of millions of devices (chargers, power banks, speakers, headphones). Their reputation is:

• Build quality: Excellent. Anker products rarely fail early.
• Price-to-performance: Consistently good value.
• Warranty support: Generally reliable, though they're newer to the UK solar market.

Against that: Anker is relatively new to plug-in solar. They haven't shipped thousands of units in UK homes like EcoFlow has. Their inverter warranty (3–5 years) is shorter than EcoFlow's (10 years).

This isn't a red flag, but it's worth knowing. You're buying from a strong company that's newer to this specific product category.

Real-World Practicality

Installation

Like the EcoFlow, the SOLIX is designed for DIY or professional installation. The kit should include:

• Two 400W panels
• Mounting hardware
• Wiring and connectors
• The RS40 micro-inverter
• UK 13A plug (pre-fitted)
• Instructions

Installation on a south-facing roof takes 2–4 hours if you're experienced. Professional installation labour: £200–£400.

Performance Expectations

Summer (June): On a sunny day, 4.5–5.5 kWh. On a cloudy day, 1.5–2 kWh. Monthly total: 450–550 kWh.

Winter (December): On a sunny day, 0.7–1.2 kWh. On a cloudy day, 0.15–0.4 kWh. Monthly total: 40–80 kWh.

Annual total (southern England): 650–850 kWh, worth £175–£230 at current grid rates.

The 33 per cent capacity boost translates to roughly 30 per cent more generation than the EcoFlow—a meaningful difference, especially in summer.

What You Need to Know

More generation, same storage problem: Without a battery, the SOLIX only helps if you're home during the day. Surplus exports to the grid at 4–5p/kWh.

Adding battery is pricey: A 3 kWh SOLIX battery costs around £1,800, pushing total system cost to nearly £2,700. That changes the payback maths significantly.

Space requirements: Two 400W panels take up more roof space than two 300W panels. If you're tight on space, this matters.

Pricing and Value

At £899, the SOLIX is genuinely good value:

• It's £50 cheaper than EcoFlow
• It gives you 33 per cent more capacity
• It comes with a UK plug (no adapter hassle)

However, the shorter inverter warranty (3–5 years vs 10 years) and newer market presence mean slightly more risk.

For pure value in summer 2026, SOLIX is hard to beat. But you're trading the comfort of an established brand for the practicality of more watts.

Comparison to EcoFlow STREAM

Choose SOLIX if:

• You want maximum generation and have the roof space
• You're comfortable with a newer brand entering the UK market
• You prioritise wattage and price over warranty length
• You like the idea of modular battery expansion

Choose EcoFlow if:

• You want a proven brand with established UK support
• You prefer the comfort of a 10-year inverter warranty
• 600W is enough for your needs
• You want expandability with the Delta battery ecosystem

Both are good kits. SOLIX offers more for less; EcoFlow offers more proven reliability. Neither is a bad choice.

What to Watch

Real-world UK performance: As with the EcoFlow, summer 2026 will bring genuine data from UK homes. Are SOLIX inverters reliable? Does the app work well in practice? We'll find out.

Warranty claims: The shorter inverter warranty is the main risk. As claims come in, we'll learn whether Anker honours them smoothly or slowly.

Battery ecosystem maturity: SOLIX batteries are new. As more people add them, we'll see whether the integration works as promised.

The Honest Assessment

The Anker SOLIX RS40P is a strong plug-in solar kit. It offers:

• 800W capacity—the UK maximum
• Pricing that undercuts the competition
• A UK plug (no adapter needed)
• A company with proven build quality

The trade-offs:

• Shorter inverter warranty than EcoFlow
• Newer to the UK plug-in solar market
• Slightly less polished app
• Newer battery ecosystem

If you want the most wattage for your money and you're comfortable with a newer brand, SOLIX is excellent value. If you want the comfort of an established player, EcoFlow is worth the extra £50.

Neither is a bad choice. Both will likely serve you well for 15+ years.

Alternatives

For government-backed reliability with a longer inverter warranty, consider the EcoFlow STREAM (600W, £949).

For a lower-cost entry point, wait for Lidl's kit in summer 2026.

For a complete comparison, see our buying guide.