What the Sunseeker X3 Plus Is and What It Costs
The Sunseeker X3 Plus is a wire-free robot lawn mower sold under stock keeping unit (SKU) SKRMX3PLUS that cuts grass without buried perimeter wiring. At the time of writing, Sunseeker lists the mower on its official store at $999.99, marked down against a $1,599.99 compare-at price. Sunseeker's cost calculator lists an MSRP of $1,599.
The listing shows the mower in stock with free shipping, standard delivery estimated at 5 to 8 business days to the contiguous US, and a 2-year warranty. Returns within 30 days are accepted only if the mower is unopened, unless it is faulty or incorrect.
Sunseeker's calculator lists these MSRPs: The V3 carries an MSRP of $999, the S4 lists at $1,799, and the X5 lists at $2,199. See our guide to robot lawn mower price.
Yard Capacity and Stated Ground Limits
The Sunseeker X3 Plus is rated for medium yards up to 0.3 acre. The long description says up to 0.5 acres; the spec section and FAQ say 0.3 acre.
Slope capabilities cap out at 30 percent, which equals an incline of 17 degrees. Sunseeker's page lists large lawns above 0.3 acre, deep ruts and uneven ground under 'Not the best fit'.
The app supports up to 100 zones, with schedules and no-go areas.
AONavi Wire-Free Navigation and Vision System
Sunseeker uses a navigation suite called AONavi Fusion to guide the mower in systematic parallel paths across the lawn. The architecture combines RTK positioning with VSLAM and Vision AI system.
Sunseeker says Vision AI recognises 360+ common yard objects. See our guide to robot mower navigation technology.
Sunseeker says Vision AI needs daylight, so the X3 Plus does not mow at night.
Cutting Deck and Battery
The cutting system on the Sunseeker X3 Plus features an 8 in cutting width, a floating cutting disc, and up to 1.6 in obstacle clearance. The cutting height is adjustable from 1.6 in to 3.2 in.
Edge trimming relies on Sunseeker's Ride-on-Edge design. This design reaches over borders to cut close to fences, beds, and hardscapes.
The battery runs up to 2 hours per charge and charges fully in about 90 minutes. Sunseeker states it cuts approximately 0.06 acre per hour. In the box, Sunseeker includes a 49-ft RTK power cord and a 26-ft charging station cord.
Manufacturer Comparison Against Competing Robot Mowers
Sunseeker publishes a direct specification comparison table on its product page contrasting the X3 Plus against Segway, eufy and Mammotion models. The table lists specs verified by Sunseeker in June 2026 for the Segway Navimow i110 and i210 AWD, the eufy E18, and the Mammotion LUBA mini AWD.
According to Sunseeker's published table, the X3 Plus matches the 8-inch cutting width of the eufy E18, exceeding the 7.1-inch cut on the Segway Navimow and the 7.9-inch cut on the LUBA mini AWD. On slope climbing, Sunseeker lists the X3 Plus at 30 percent (17 degrees), trailing the Mammotion LUBA mini AWD rating of up to 80 percent (38.6 degrees). The table covers the Navimow i110 / i210 AWD and LUBA mini AWD; our reviews of the Segway Navimow i105 and Mammotion LUBA 4 AWD cover different models.
Sunseeker lists the X3 Plus as non-AWD.
| Model (Manufacturer Table) | Cutting Width | Max Slope | Drivetrain Type |
|---|---|---|---|
| Sunseeker X3 Plus | 8 inches | 30% (17 degrees) | Non-AWD positioning |
| Segway Navimow i110 / i210 AWD | 7.1 inches | 30% to 45% by model | i110 non-AWD / i210 AWD |
| eufy E18 | 8 inches | 18 degrees | Non-AWD positioning |
| Mammotion LUBA mini AWD | 7.9 inches | Up to 80% (38.6 degrees) | AWD |
What Sunseeker Does Not Publish
Sunseeker leaves several common technical specifications unpublished on its official store portal. Sunseeker publishes no specific decibel (dB) noise rating, no ingress protection (IP) water-resistance classification, and no initial market release date. Sunseeker also omits cellular or Wi-Fi requirements and ongoing app subscription terms.
The store page shows 270 five-star, 75 four-star, 8 three-star and 1 one-star ratings (store reviews on the seller's own page). The Bot Scout has not tested this machine independently.
Two reviewers on the store page report app Wi-Fi dropouts at the back of a yard.
Verdict
Sunseeker lists wire-free mowing for yards up to 0.3 acre at $999.99. No perimeter wire is needed.
Homeowners with lawns exceeding 0.3 acre, properties with steep hills above 17 degrees, or yards covered in deep surface ruts should not buy the Sunseeker X3 Plus. Those buyers should explore alternatives in our guide to the best robot lawn mowers for 2026.
For now, buyers with smooth, moderately sized yards can confirm current stock and return terms details directly on the Sunseeker X3 Plus store page.
Bottom Line
Sunseeker lists the X3 Plus for medium yards up to 0.3 acre at $999.99 against a $1,599.99 compare-at price. Sunseeker lists as not the best fit: lawns above 0.3 acre, deep ruts and uneven ground.
FAQs
Is the Sunseeker X3 Plus worth it?
Sunseeker lists it at $999.99 for wire-free mowing on yards up to 0.3 acre and 30% slopes, but not for yards with deep ruts, uneven ground, or night mowing.
How much does the Sunseeker X3 Plus cost?
The Sunseeker X3 Plus costs $999.99 on Sunseeker's official store at the time of writing, marked down against a $1,599.99 compare-at price. Sunseeker's cost calculator also lists an MSRP of $1,599. Sunseeker includes free shipping to the contiguous United States.
What size lawn is the Sunseeker X3 Plus made for?
The Sunseeker X3 Plus is made for lawns up to 0.3 acre according to Sunseeker's spec section and FAQ. While the product description text mentions coverage up to 0.5 acres, Sunseeker explicitly lists lawns larger than 0.3 acre under its not the best fit guidance.
Does the Sunseeker X3 Plus need a boundary wire?
The Sunseeker X3 Plus does not need a perimeter boundary wire. It navigates wire-free using Sunseeker's AONavi Fusion system, which integrates RTK positioning, VSLAM vision, and Vision AI that recognises 360+ common yard objects.
How steep a slope can the Sunseeker X3 Plus handle?
Sunseeker lists up to 30% (17 degrees).
Can the Sunseeker X3 Plus mow at night?
Sunseeker says Vision AI needs daylight, so it does not mow at night.