Today announced the official launch of the MULR-F electric roller brush, a new portable, all-weather powered cleaning device. Built around a self-driving rotating brush and a lightweight telescopic pole, the MULR-F lets a single operator clean small residential rooftop solar arrays – and glass facades, billboards and other mirror-like surfaces – without ladders and with minimal water.
1. Dust: The Solar Industry's Invisible Tax
Soiling is widely regarded as a silent killer of solar power generation. According to the IEA Photovoltaic Power Systems Programme (IEA PVPS), soiling is the single most influential factor affecting PV energy yield after irradiance itself. Studies show a thin layer of dust accumulated over a few months can cut panel output by 5% to 20%, and losses can exceed 25% in arid or desert-adjacent regions; when bird droppings combine with heavy soiling, laboratory tests recorded output losses of up to 44%. The IEA estimates that soiling costs the global PV industry billions of euros every year.
At the same time, installed capacity keeps climbing. In January-July 2026, solar generation in China reached 802.4 TWh, up 15.5% year on year, accounting for roughly 13% of the nation's electricity consumption. The larger the fleet, the heavier the cleaning bill - and conventional washing is far from light: researchers at MIT estimate that cleaning solar panels worldwide consumes about 10 billion gallons of water each year, enough drinking water for up to 2 million people[4], while manual scrubbing is labor-intensive and can leave irreversible scratches on module surfaces.
2. MULR-F: A Brush That Spins Itself
The MULR-F is a portable, all-weather cleaning tool. Its motor drives a PBT-bristle roller so the operator simply grips the pole and pushes - scrubbing and rinsing in one pass. For residential and light-commercial rooftops, it comes down to three strengths:
- • Reach: a telescopic pole in three lengths (3.5 m / 5.5 m / 7.5 m) with a multi-section locking structure and orange non-slip knobs. Long-reach work needs no ladder, sharply cutting fall risk; the anti-slip grip stays secure even with wet hands.
- • Flat contact: the L-shaped bent conduit offsets the brush head from the handle to avoid interference, so the roller lies flat on vertical facades, soffits and roof edges - corners included.
- • Power: a 33 W motor spins the Ø125 mm × 380 mm roller at 420 RPM no-load (340 RPM under load). The 14.8 V / 5,000 mAh battery delivers about 2 hours of runtime and recharges in roughly 3 hours; the aluminium body weighs just 3 kg for comfortable one-person operation.
3. Technical Specifications
Key specifications of the MULR-F:
| Item | Specification |
|---|---|
| Mechanical | |
| Model | MULR-F |
| Telescopic pole | 3.5 m / 5.5 m / 7.5 m, three options |
| Brush dimensions | Ø125 mm, 380 mm total length |
| Brush material & life | PBT, approx. 2-year brush life |
| Head dimensions | 430 mm × 130 mm × 250 mm |
| Body & weight | Aluminium alloy, only 3 kg |
| Packing size | 440 mm (L) × 140 mm (W) × 260 mm (H) |
| Electrical | |
| Motor power | 33 W |
| Motor speed | 420 RPM no-load / 340 RPM under load |
| Power input | 14.8 V DC |
| Battery | 5,000 mAh |
| Runtime & charging | About 2 h continuous work, about 3 h recharge |
| In the box | Charger, 3 mm hex key, telescopic pole |
4. One Brush, Many Surfaces
Beyond rooftop PV arrays, the MULR-F suits glass curtain walls, outdoor billboards and other glass or mirror-like surfaces in both residential and light-commercial settings. Its low-water working principle gives it a natural edge in water-scarce regions. The brush lasts about two years, and the charger, 3 mm hex key and telescopic pole ship in the box - ready out of the crate.
Post time: Nov-11-2026