Robomow RK4000 vs Husqvarna Automower 415X
Quick take: The Robomow RK4000 is rated for a larger lawn (1 acre); the Robomow RK4000 is rated for steeper ground (45%); the Robomow RK4000 cuts taller (up to 3.9"), which matters for fescue and warm-season grasses; the Husqvarna Automower 415X has built-in cellular for GPS tracking and away-from-home control.
| Spec | Robomow RK4000 | Husqvarna Automower 415X |
|---|---|---|
| Price | ~$1,999 | ~$1,999 |
| Rating | — | — |
| Navigation | Boundary Wire | Boundary Wire |
| Max Lawn Size | 1 acre (43,560 sq ft) | 16,117 sq ft (16,117 sq ft) |
| Max Slope | 45% (24°) | 40% (22°) |
| Cutting Width | 16.5" | 8.7" |
| Cut Height | 0.6"–3.9" | 0.8"–2" |
| Drive | RWD | RWD |
| Runtime | 120 min | 50 min |
| Charge Time | 110 min | 60 min |
| Noise | 65 dB | 62 dB |
| Weight | — | 21.4 lb |
| Obstacle Detection | Bumper on a floating deck plus lift and tilt sensors; no cameras or ultrasonics. | Bumper collision sensor plus lift and tilt sensors; no ultrasonic or camera, so it nudges obstacles rather than avoiding them |
| Edge Cutting | Yes | No |
| Rain Sensor | Yes | No |
| Cellular | No | Yes |
| Anti-Theft | PIN code, child lock and lift alarm | PIN code, lift alarm, GPS tracking and geofence alerts |
| Warranty | 3-year limited | 2-year limited |
Pros & cons
Robomow RK4000
- ✓16.5 in twin-disc cut is double the width of the smaller RKs and rare under $2,000
- ✓110-120 minutes of mowing per charge on the 9.6Ah pack
- ✓Owners report quiet running, clear setup documentation and better slope handling than similar mowers
- ✓Offset blades and near-wire following trim edges; floating deck copes with rough ground
- ✗Owners report units that stop seeing the boundary wire and support tickets left unanswered for a month
- ✗Random pattern leaves patches uncut on a full acre
- ✗App is Bluetooth-only in practice: no remote start, no job cancel, and it forgets your PIN
- ✗A full-acre wire install is a weekend job, and the wire is the most common failure point
- ✗Robomow's US presence is Home Depot only since the MTD sale; the maker's US site redirects to a parts store
Husqvarna Automower 415X
- ✓Light 21-pound body squeezes through narrow passages and is easy to carry
- ✓Electric cut height, GPS theft tracking, LED lights and cellular app control from the pricier X-line
- ✓Owners report a half-day DIY wire install if the instructional videos are followed
- ✓GPS-assisted mapping and systematic passage mowing cover small, complex yards evenly
- ✓Sold and serviced through Husqvarna dealers with a 2-year warranty
- ✗Durability complaints: warped cutting disks, lost front wheels and units that would not start after winter
- ✗0.8 to 2 inch cut range is too short for tall fescue and bluegrass lawns
- ✗62 dB is louder than most current wire-free rivals
- ✗Short 50-minute runtime means frequent trips back to the dock
- ✗Marked discontinued by Husqvarna; wire-free Navimow and Mammotion mowers cost the same or less