Security Robot Energy Use: kWh/h in Real Operation

Plant managers integrating robotics into perimeter security hit a technical question with commercial weight early on. How much electricity does a security robot draw per hour? What does that mean for OpEx, KRITIS evidence and CO2 accounting? This article delivers defensible kWh figures from DACH industrial profiles and weighs them against staffing costs.

Security robot energy use: the operational metric

kWh per patrol hour is the only defensible comparison figure between vendors. Datasheets quoting range in kilometres or runtime in hours obscure the real load point. Anyone wanting to understand patrol robot power consumption asks for kWh/h in writing.

In the typical DACH industrial profile, the QR-2 outdoor patrol robot averages 0.42 kWh/h in 24/7 outdoor operation. The smaller QR-1 sits at 0.18 kWh/h in indoor use. The QR-3 with LiDAR and drone detection reaches 0.68 kWh/h because the LiDAR stack and active drone detection add compute and sensor load.

Worked example at an industrial electricity price of €0.22/kWh (source: BDEW electricity price analysis): QR-2 at 0.42 kWh/h and 720 operating hours per month produces 0.42 × 720 × 0.22 = €66.53 in pure electricity cost. After charging time, effective patrol hours land around 530, and most sites end up between €80 and €130 in electricity per robot per month.

Energy cost therefore makes up under 4% of the RaaS fee and is included in the rental model anyway. For comparison: a 24/7 guard post draws 0 kWh. Staffing cost sits at €15,000 to €25,000 per month, including non-wage costs and Manteltarifvertrag premiums.

Next step: review the full TCO comparison of guard service against robotics.

Load profile: drive, sensors, compute

The guard robot energy balance follows a stable distribution. Drive consumes about 55% of energy, sensors 25%, edge compute 20%. Drive load scales with gradient, surface and patrol speed.

The QR-2 thermal camera draws a constant 12 W, regardless of time of day or patrol speed. QR-3 LiDAR runs at 18 W at a 10 Hz sample rate and dims to 4 W in standby. GPU inference for person detection scales with event density, not patrol time. A robot on a quiet night shift draws less compute load. A unit in a high-frequency logistics yard sits correspondingly higher.

Under sustained high detection load, consumption can run 15 to 20% above the nominal value. Battery management heating raises winter consumption in DACH by an additional 8 to 12%. Anyone extrapolating summer test kWh figures directly into annual planning underestimates real OpEx demand.

The EU Machinery Regulation 2023/1230 governs safety requirements for autonomous mobile systems including power supply and thermal management.

Charge cycles and availability

Charge cycles for autonomous security is the second metric plant managers must check concretely. The QR-2 patrols for 4.5 hours, charges for 90 minutes, and reaches 73% net patrol time. Anyone needing 100% coverage plans a tandem of two robots.

The inductive charging station draws 1.8 kW during charging, peak load stays under 2 kW. Two robots in tandem cover a mid-sized site without patrol gaps. While robot A patrols, robot B charges, and vice versa.

Battery life sits at 2,000 full cycles, which equates to around 5 years under a DACH industrial profile. Battery swap is included in the RaaS contract, no separate investment. Patrol routes are software-optimised to minimise empty runs to the charging station. That cuts total consumption by 6 to 9% against fixed routes.

Practice: in perimeter security in industrial parks two QR-2 units cover sites up to 80,000 m², three robots from 120,000 m² upward.

CO2 footprint per patrol hour

At the 2024 German grid mix (380 g CO2/kWh, source: Umweltbundesamt), QR-2 emits about 160 g CO2 per patrol hour. A diesel patrol vehicle in plant security emits 2,300 g CO2/km. That is a factor of 30 higher at comparable coverage. A guard on foot causes no direct emissions, but travel to site, lighting and break-room operation do.

The Swiss grid mix (24 g CO2/kWh thanks to a high hydro share, source: BAFU/Pronovo) pushes emissions down to 10 g CO2 per patrol hour. At Austrian sites with their own on-site PV, robot operation with certified green power can be run effectively carbon-neutral.

ESG reporting under CSRD benefits directly from documentable energy data. Quarero delivers monthly kWh and CO2 reports per robot from the fleet portal. These data feed into the Scope 2 inventory without rework.

EN ISO 13482 defines requirements for personal care and service robotics, including energy management and safety-relevant shutdown logic.

Site energy infrastructure

Robotics OpEx for perimeter security starts with site preparation. A charging station needs 230 V Schuko or optional 400 V CEE for fast charging. Site preparation covers a covered location, 1.5 m² of floor area and a network connection (LAN or 5G router).

For three robots a 16 A fuse is sufficient, provided load management staggers the peaks. Load management automatically shifts charge cycles into low-tariff windows, typically between 22:00 and 06:00. That cuts energy cost in plants with a peak/off-peak contract by 10 to 18%.

Emergency power requirements under the KRITIS Umbrella Act (KRITIS-Dachgesetz) are covered by a UPS or island battery at the charging station. During a grid outage the UPS keeps the robot in patrol mode until backup power kicks in or the grid returns. Quarero plans the infrastructure for the pilot setup within 48 hours together with the plant engineer. No building permit, no intervention in primary installation.

TCO: energy against staffing cost

TCO for a security robot does not balance on energy cost. It balances on the staffing cost the robot replaces or supplements. A 24/7 guard post in Germany costs €15,000 to €25,000 per month including non-wage costs, shift premiums and Manteltarifvertrag (source: BDSW collective agreement, Bundesagentur für Arbeit).

The QR-2 under the Robotics-as-a-Service model costs €3,500 per month, energy included. On a mid-sized industrial site, one robot replaces 0.8 guard post equivalents. The remaining 0.2 equivalent stays with §34a-qualified Streife and intervention units. The robot does not replace those.

Staff turnover in the guard sector ran above 30% per year recently, according to BDSW figures. Energy is plannable, tariff wage increases are not. Inside the 24-month RaaS contract, energy cost is fixed. The tariff wage rises 6 to 9% over the same period.

Payback on the model switch typically lands in the first contract month. The precondition is full or partial substitution of a single guard post. The full calculation sits in the TCO comparison of guard service against robotics.

Energy and KRITIS requirements

The KRITIS-Dachgesetz requires redundant power supply for security-relevant systems. Robots with hot-swap batteries bridge grid outages without patrol interruption. The BSI-KritisV defines availability and documentation obligations for critical infrastructure, without setting a specific kWh threshold.

What is required is documented availability. The Quarero fleet portal logs every charge phase audit-proof for BBK reporting. Energy data feed into the ISMS under ISO 27001 and into NIS-2 evidence. The NIS-2 directive requires demonstrable availability and energy redundancy for essential entities.

A robot outage caused by a flat battery is reportable like any other incident. Plant managers integrating robotics into KRITIS reporting need charge cycle logging. It must document cause unambiguously: battery defect, charging station offline or grid interruption. Quarero ships this log by default.

Required reading: the KRITIS-Dachgesetz checklist.

From kWh value to pilot operation

Energy consumption is rarely transparent in vendor brochures. Ask for kWh/h values in writing. Demand separation by patrol mode, standby and charging. Vendors who cannot deliver these figures have not measured them, or the figures are unfavourable.

Quarero documents consumption per robot, per patrol, per month. An 8-week pilot delivers real consumption data for your site, including winter and summer load. Delivery happens within 48 hours, site preparation runs in parallel with the contract phase.

The 24-month minimum term fixes energy cost across the full contract period. Plant managers needing Q4 budget certainty get it without an index clause and without spot-market price adjustment.

Direct contact with Marcus Köhnlein, Sales Lead Switzerland for CH sites, with Dr. Nagel for DE and AT. The full cost comparison with figures per square metre and per patrol hour sits in the TCO comparison of guard service against robotics.