Case studies

Vanderkooi Dairy

Vanderkooi Dairy

Up to 15%

additional production per month


Average increase over the course of three months

“I am glad that we added the RST system to our solar array. You can easily tell the difference in the level of cleanliness. Now, my panels are always blue and I know that I’m getting the most out of them. We’re seeing consistently higher energy outputs compared to last year when we were scheduling monthly cleanings. The install was quick and RST has been easy to work with. My system practically cleans itself now as frequently as need be. RST has truly helped me realize the full potential of my solar investment.”

Charles Vanderkooi of Riverdale, California used RST to increase the production of his solar panels. He was previously paying to have his panels cleaned once a month.

Increased production over monthly manual cleanings

Over the course of this case study, RST improved energy production by 13% on average. That is 13% better than the previous year where the owner was paying to have his panels cleaned once a month. In other words, even with monthly panel cleaning, the owner was still losing roughly 13% energy production each month due to the dirt accumulating on his panels between cleanings.

RST CleanTech installed the RST NightWash™ system – an active cleaning solution (ACS) – on a 1.1 MW single axis tracker system located in Riverdale, California in May of 2022. The installation took only 3 weeks. RST pulled off working with a 2” water pipe near the dairy and used a standard electrical plug from the weight station to run the entire system.

How much are you losing between manual panel cleanings?

This customer was paying to have his panels cleaned every month and was losing out on a significant amount of energy and thus revenue. What about your system? Regardless of frequency, there’s a good chance that you’re overpaying for manual panel cleanings that leave your system still underperforming expectations. This can be easily avoided.

No one should settle for looking at dirt-covered brown panels. Stop waiting for the panel cleaner to arrive, keep your panels blue all the time with RST NightWash™!

For more information, download

the case study here.

Why RST CleanTech?

Over 10 years ago, we set out to solve one of the biggest problems facing solar – panel soiling. We wanted to find a way to keep panels clean, maximize energy production, protect panel warranties, and increase revenue for system owners.

We knew there had to be a way to achieve our goals that didn’t entail deploying thousands of bristle-wielding workers or robots onto high voltage solar arrays across the world. When we realized there wasn’t, we created one. Enter, RST NightWash™.

RST NightWash™ is a safe, cost-effective, and eco-friendly automated solar panel cleaning solution.


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