Gardena SILENO City 500 Robotic Lawnmower (Black/Grey/Turquoise, 500m²)

What size garden is the Gardena SILENO City 500 designed for?

It is rated for lawns up to 500m². This makes it well suited to medium-sized residential gardens. If your lawn is significantly larger than 500m² you would need to look at a higher-capacity model. The 500m² rating refers to the actual grass area rather than the total garden footprint so factor in paths, borders and beds when calculating your lawn size.

How long does the battery last and how long does it take to charge?

The battery charges fully in 60 minutes and provides approximately 65 minutes of mowing time per charge. The mower automatically returns to its charging station when the battery runs low and then heads back out to continue the job once charged. This cycle repeats throughout the day so the mower progressively works through your lawn without any manual intervention required.

Does the mower need to be brought inside when it rains?

No. The mower is fully waterproof and will continue operating in wet conditions. This is particularly useful in the UK where rain is frequent and unpredictable. If the unit gets dirty or muddy during operation it can be cleaned directly with a garden hose. There is no need to dismantle it or take special precautions before hosing it down.

How much work is involved in setting it up?

Setup requires laying a boundary wire around the perimeter of your lawn and connecting a guide wire back to the charging station. The box includes 150m of boundary wire, 200 hooks, 4 couplers and 5 connectors. Reviewers report the setup taking around 4 to 5 hours depending on garden size and complexity. The charging station also needs a permanent outdoor power supply. Gardena provides setup tutorials online which are worth watching before you start.

Does the charging station need to stay outside permanently?

Yes. The charging station is designed to remain in the garden throughout the mowing season. It needs to be connected to an outdoor power supply. This is something to plan for before purchasing you will need a weatherproof outdoor socket or a suitable outdoor extension lead. The station and boundary wires are designed to be low-profile and blend into the garden once installed.

How does the anti-theft protection work?

The mower requires a personal four-digit PIN code to be entered before it will operate. If someone picks it up and tries to use it without the code it will not function. This acts as a practical deterrent against opportunist theft. That said, it is still sensible to position the charging station in a less visible part of the garden rather than relying solely on the PIN as a security measure.

Can it handle slopes and uneven ground?

The mower can handle inclines of up to 25%. This covers most typical residential garden slopes. On steeper gradients beyond this limit the mower may struggle to maintain traction or operate safely. The swivelling rear wheel helps with agility on uneven terrain and the SensorCut motor adjusts cutting direction to maintain an even finish across different ground conditions.

What is included in the box and do I need to buy anything extra?

The box includes the robotic mower itself, 150m of boundary wire, 200 hooks, 4 couplers, 5 connectors, a charging station with UK plug and an English user manual. For most standard gardens up to 500m² everything needed for installation is included. You will however need access to an outdoor power socket for the charging station. If your garden has multiple separate lawn sections you may need to plan the wire routing carefully as this adds complexity to the setup process.