S2 Systems Appoints Bill Vietas as CEO to Lead Strategic Growth Phase
S2 Systems, a fast-growing electrical equipment OEM for the solar industry, today announced the appointment of Bill Vietas as Chief Executive Officer. Dennis Zielke, original founder and product visionary, will transition to the role of Chief Technology Officer, focusing on engineering, innovation, and new product development.
This transition marks a strategic next step as S2 Systems enters a new phase of growth. With increasing demand and strong market traction, Vietas and Zielke are aligning their roles around their respective strengths and specialization. Vietas will take the helm to lead business strategy and scale operations, while Zielke will concentrate fully on engineering and product innovation—ensuring both leaders are positioned to drive long-term success for the company.
“This transition has been part of our strategic plan since Bill joined the team,” said Zielke. “His deep experience in business leadership and the solar industry makes him the right person to lead S2 Systems into its next phase of growth. For me, this shift creates space to focus on what I enjoy most: engineering. I’m excited to spend more time developing the solutions our customers need and driving innovation forward.”
“This transition has been part of our strategic plan. Bill’s deep experience in business leadership and the solar industry makes him the right person to lead S2 Systems into its next phase of growth.”
—Dennis Zielke
Vietas, a majority shareholder at S2 Systems, has played a key role in shaping the company’s strategy and early momentum. His previous experience includes co-founding RBI Solar and helping scale multiple equipment companies to national reach.
“We’ve built a solid foundation—great products, a talented team, and a clear market need,” said Vietas. “This transition is about putting the right people in the right roles so we can scale smartly and serve our customers even better. I’m honored to lead S2 Systems into this next chapter.”
“We’ve built a solid foundation—great products, a talented team, and a clear market need. I’m honored to lead S2 Systems into this next chapter.”
—Bill Vietas
The mission of S2 Systems is to deliver high-quality electrical equipment purpose-built for the solar and storage industry. The company is focused on being a customer-centric partner, delivering solutions that simplify installation and create long-term value across operations and maintenance. Every product and decision at S2 Systems reflects a “Deliberate by Design” mindset: intentional, thoughtful, and grounded in solving real-world challenges for the solar market.