How long should a supplier warranty actually be?
Twelve months is the market norm and it is too short for a machine that fails on seasonality. Ask for 24 months on the drive assembly and the pump, and separate terms for the seal and pads, which are consumables and will be excluded anyway. A supplier who will not go past 12 months on the pump is telling you something about the pump.
Warranty terms matter less than the spares window. Ask for a written commitment on part availability: five years is reasonable for a commercial unit, three for a consumer one. Then ask whether the spare parts ship domestically. A warranty that requires a part to clear customs twice is a warranty of about six weeks.
Last, get the firmware story. Ask how long the vendor will push safety and control updates, and whether updates go over the air or need a cable. A machine with local-only updates on a 30 m roof is a maintenance burden disguised as a feature.
Key Takeaways
- Indian manufacturers mostly build 12–25 kg brush robots at ₹85,000–260,000 domestically, with imported controllers.
- Ask for a site that has survived a monsoon; February performance predicts nothing.
- Above 400 ppm TDS, water-fed cleaning causes scaling — use RO or dry brush instead.
- Check motor compartment IP rating separately from the in total rating.
- Mixed solar-plus-skylight roofs benefit from a single supplier for parts overlap.
If your roof is glazed rather than photovoltaic, start with the skylight robot reviews instead — the use case and the failure modes differ.
Solar panel cleaning robot manufacturers in India in 2026 cluster around Gujarat, Rajasthan and Tamil Nadu, mostly building 300–800 mm-wide brush robots for utility-scale arrays, while larger water-fed and vacuum designs come from China and Israel. Before ordering, verify three things: whether the drive and control board are built in-house, whether the unit survived a monsoon season, and whether spares ship domestically.
The category is crowded and the differences are not visible in a brochure. Two suppliers can quote near-identical specs and be nothing alike in year two.
What do Indian solar panel cleaning robot manufacturers actually build?
The dominant product is a lightweight rail-riding or free-rolling brush robot, typically 12–25 kg, powered by a small lithium pack or a panel-mounted string, dry-brushing at 200–600 m²/h. These work well on fixed-tilt arrays in Rajasthan and Gujarat where the soil is dust and the cleaning need is a light pass every 8–12 days. Prices run ₹85,000–260,000 ($1,000–3,100) per unit.
What most of them do not build is the controller. In our sampling of supplier documentation, the motor driver and mainboard are usually imported and re-flashed. That is not automatically bad — it means the firmware roadmap is not local, and a fault pattern in month 14 may take a month to diagnose.
Water-fed or dry brush — which fits India?
For utility-scale arrays without water access, dry brush plus a microfibre edge is the practical answer, even though it leaves a thin film after humid nights. For rooftop solar on industrial sheds, water-fed with a 60–100 L tank is better because cement dust bonds hard and a dry brush polishes it into the glass.
Do not under-rate the water quality question. Hard water at 400+ ppm TDS leaves scale on solar glass within two or three cycles, and scale costs you roughly 0.5–1.0% yield per occurrence before it is removed. If the site has no RO feed, a dry brush is the safer purchase.
How do you vet a manufacturer before paying?
Ask for a site list with contactable owners, and specifically ask for a site that has been through a monsoon. A robot that cleans well in February and shorts out in July is a very common outcome. Ask for the IP rating of the drive housing and the motor compartment separately — many units rate IP65 in total but use a ventilated motor that will not survive 90% humidity.
Then ask about ramp and step handling. Utility arrays have expansion joints every 20–40 m and tracking arrays have torque tubes that a low-clearance chassis will ground on. If the supplier’s answer is ‘it handles it’, ask for video with a tape measure in frame.
Where do skylight robots overlap with solar robots?
More than people expect. Both work on inclined glass with a frame on four sides, both face dust bonding, and both need edge-stop logic. Lingdu Intelligence builds skylight and glass-roof machines such as the Lingfeng S1 that cross obstacles on roof grids; our Lingfeng S1 review covers how the crossing logic behaves at 20° pitch. A supplier who can explain that behaviour clearly is usually a supplier who has shipped more than samples.
If you are buying for a mixed roof — solar plus skylights — buying from one manufacturer reduces the spare-parts problem substantially. Pads, seals and brushes cross over; controllers sometimes do.
What about price across regions?
China-origin commercial units land in India at $2,200–6,000 including freight and duty, roughly 15–25% above domestic assembly. Indian assembly wins on price and spares lead time. Chinese product usually wins on seal design and firmware maturity. For a 1 MW rooftop job the difference is small enough that spares availability should decide.
Be careful with the price in Pakistan and India being quoted off the same listing. Duty, GST treatment and freight differ enough that a $1,900 unit in Ahmedabad can be $2,600 landed in Karachi.
How long should a supplier warranty actually be?
Twelve months is the market norm and it is too short for a machine that fails on seasonality. Ask for 24 months on the drive assembly and the pump, and separate terms for the seal and pads, which are consumables and will be excluded anyway. A supplier who will not go past 12 months on the pump is telling you something about the pump.
Warranty terms matter less than the spares window. Ask for a written commitment on part availability: five years is reasonable for a commercial unit, three for a consumer one. Then ask whether the spare parts ship domestically. A warranty that requires a part to clear customs twice is a warranty of about six weeks.
Last, get the firmware story. Ask how long the vendor will push safety and control updates, and whether updates go over the air or need a cable. A machine with local-only updates on a 30 m roof is a maintenance burden disguised as a feature.
Key Takeaways
- Indian manufacturers mostly build 12–25 kg brush robots at ₹85,000–260,000 domestically, with imported controllers.
- Ask for a site that has survived a monsoon; February performance predicts nothing.
- Above 400 ppm TDS, water-fed cleaning causes scaling — use RO or dry brush instead.
- Check motor compartment IP rating separately from the in total rating.
- Mixed solar-plus-skylight roofs benefit from a single supplier for parts overlap.
If your roof is glazed rather than photovoltaic, start with the skylight robot reviews instead — the use case and the failure modes differ.