Designed and built in Sibiu, Romania

Autonomous cleaning for solar PV

GTT Robots builds a robot that navigates between panel rows on its own and keeps them at maximum efficiency, with no crews on site.

No crewson the roof or in the park

Patent pendingsuction-cup grip

2027first pilots

Calculate your loss Join a pilot

Rooftop field test, November 2026

Why clean

How much a dirty panel loses depends on the climate

Dust, pollen and snow block sunlight before it reaches the cells. Peer-reviewed field studies measure the loss in three typical climates.

Temperate Europe

3–5% / year

Dust, pollen, bird droppings. EU average: 0.9% where rain cleans well, up to 5.3% where it doesn’t (peaking at 14% in Spain).

Desert regions

20–40% / year

0.5–1% lost per day; without cleaning, up to 43% of output gone in 6 months (Qatar) and about 15% in a single month.

Snowy climates

100% / month

Under snow cover, monthly output drops 90–100%; annually, 1–12% of energy (up to 34% in extreme climates).

Savings calculator

What dirty panels cost you: try it on a roof or a park

Pick a climate and a size. Every input can be changed to match your installation.

Installation

Climate

1,200 kWh per kWp per year. Typical loss 3–10% (dust plus snow).

System size 10 kWp

A typical home roof is about 10 kWp (20 panels).

Energy lost to dirt and snow 5%

Electricity price

€ per kWh

Romanian household average, 1.3 lei/kWh at 5.34 lei per euro.

Lost every year

€115

Sand shows the share of yearly output lost to dirt and snow.

Yearly output: 12,000 kWh
Energy lost: 480 kWh
A clean array can win back: up to €115 a year

At the planned price of €500, one robot pays for itself in about 4.3 years on a 10 kWp roof. Homeowners also buy it for safety, with no one on the roof, and for clearing snow.

Reference case	Output / year	Loss	Energy lost	Value / year
Prosumer 10 kWp · Romania	12,000 kWh	3–10%	360–1,200 kWh	€86–288
Prosumer 10 kWp · desert	17,500 kWh	20–40%	3,500–7,000 kWh	€840–1,680
Prosumer 10 kWp · snow	10,000 kWh	5–15%	500–1,500 kWh	€120–360
Park 1 MWp · Romania	1,200 MWh	3–10%	36–120 MWh	€3,200–12,000
Park 10 MWp · Romania	12,000 MWh	3–10%	360–1,200 MWh	€32,000–120,000

Rooftop values at the Romanian household price (€0.24/kWh); park values at utility prices (€90–100/MWh). Yield: 1,200 kWh/kWp/yr Romania; 1,750 desert; 1,000 snowy climate.

The solution

A robot that covers the whole array on its own

Autonomous navigation

Centimetre-level positioning: the robot moves and aligns itself on the panel rows, generating a map to cover the full panel.

Proprietary grip

A suction-cup system developed and built in-house, the core of our innovation and patent pending, for a secure hold that never stresses the glass.

No crews needed

Cleaning cycles scheduled (overnight / on demand), with low water use / dry cleaning and automatic reporting to the operator.

The robot: dark shell, two suction-cup units underneath and a cleaning roller on each side — The robot: suction-cup units underneath, a cleaning roller on each side (3D render)

How it covers an array: row by row, then on to the next row by itself

Technology

Engineered in-house, from suction cup to software

Exploded view: shell, electronics and battery, drive, suction-cup units and rollers (interactive 3D model)

Multi-sensor localisation and mapping

Dual-EKF fusion of suction-cup wheel odometry, IMU, visual edge detection and motor-current edge sensing, generating an accurate map of every panel on the array.

Industry-standard software

Navigation stack with path planning, validated against a matrix of test scenarios. The same architecture drives one robot on a roof or orchestrates a whole fleet in a park.

Hardware we control

Suction cups and gears made in-house, electronics designed in-house, PCB fabrication outsourced: cost and quality controlled at the source.

Intellectual property

European patent application pending on the grip system, manufacturing know-how, and our CTO’s granted patents in solar technology.

What we offer

One robot for your roof, a fleet for your park

The GTT Robots prototype on a solar panel: cleaning roller in front, suction-cup unit and electronics behind

Homes and business roofs · pilots from 2027

A robot for your rooftop (10–200 kWp)

One robot per home

Installed and supported through PV installers you already know
Cleans on a schedule, so no one has to climb on the roof
Clears dust, pollen and light snow to keep output up

The robot on a long row of panels in a utility solar park

Utility solar parks · from 2028

Fleets for solar parks, as a service

Robots-as-a-Service

One robot per string, centrally orchestrated by our navigation software
No upfront cost: a multi-year service contract
Cleaning cycles planned around generation, with reports for your O&M team

Service included

Maintenance, spare parts, and soiling and panel-condition reports that plug into your O&M platform.

Where we are

A working prototype, field-tested on real roofs

Working prototype. Autonomous navigation demonstrated on a rooftop array; the cleaning module is fully integrated in Q1 2027.

Protected technology. European patent application pending on the grip system; 2 Romanian patents in solar technology held by our CTO.

Pilots in 2027. We are selecting homeowners, PV installers and park operators for the first pilots. Get in touch.

Why GTT Robots

Autonomy between rows is the difference

Criterion	Manual cleaning	Robots without navigation	GTT Robots
Autonomy	None: crews on site	Partial: moved by hand between rows	Full: navigation across the whole array
Operating cost	High	Medium: dedicated operator	Low: no operator
Cleaning frequency	1–2 times a year	Limited by staff	As often as needed: scheduled cycles
Upfront cost	No equipment	Imported, external service	Made in Romania; parks as a service, with no upfront cost

The team

Founders who have built hardware before

Oana Gutt

CEO, co-founder

5 years of management experience in operations and technology
Leads pilots and customer partnerships

Robert Gutt

CTO, co-founder

PhD in applied mathematics; researcher at INCDTIM Cluj-Napoca
Navigation Lead at dotLumen, a deep-tech company admitted to the EIC Accelerator
2 granted patents in solar technology; leads two national research grants

Roadmap

From the first rooftops to fleets for solar parks

Q1 2027
Fully integrated prototype: navigation + cleaning module
Q3 2027
First rooftop pilots: 5 robots installed with PV installer partners
H2 2027
Small series of 20 robots and certification; first fleet pilot on a partner solar park
2028
Fleet service contracts with solar park operators

Autonomous cleaning for solar PV

How much a dirty panel loses depends on the climate

Temperate Europe

Desert regions

Snowy climates

What dirty panels cost you: try it on a roof or a park

A robot that covers the whole array on its own

Autonomous navigation

Proprietary grip

No crews needed

Engineered in-house, from suction cup to software

Explode

Multi-sensor localisation and mapping

Industry-standard software

Hardware we control

Intellectual property

One robot for your roof, a fleet for your park

A robot for your rooftop (10–200 kWp)

Fleets for solar parks, as a service

Service included

A working prototype, field-tested on real roofs

Autonomy between rows is the difference

Founders who have built hardware before

Oana Gutt

Robert Gutt

From the first rooftops to fleets for solar parks

More energy from the same panels