News

How Our Solar Combiner Box Is Powering the Future of Solar Energy

Posted on by Power Assemblies
Power Assemblies PV Solar Combiner Box
09
Sep

As the United States embraces renewable energy, solar power is taking center stage!

Over the course of this year, we’ve seen the demand for utility-scale and commercial solar projects grow faster than ever before. In fact, the amount of electricity generated by domestic solar facilities grew 28% from March 2024 to March 2025 (Kennedy, 2025). This momentum proves that solar power isn’t just a trend, it’s here to stay!

Behind the scenes, equipment like our Solar Combiner Box is powering this revolution. According to a recent report, the market for Photovoltaic Combiner Boxes is expected to grow at a projected compound annual growth rate of 5.1% through 2035 (Future Market Insights, 2025). This highlights a nationwide shift toward eco-friendly energy, and we’re proud to be a part of that journey.

Whether you’re new to solar energy or just looking to expand your knowledge, we’re here to help! In this article, our engineers will walk you through everything you need to know about our PV Combiner Box. We’ll break down how it works, where it’s used, and the different ways that our Combiner Box can be configured.

What’s a Solar Combiner Box?

Have you ever wondered how solar farms consolidate all the electricity generated by hundreds, or even thousands of solar panels? As electricity moves through the solar system, it needs to be gathered up and organized before it can be put to good use. That’s where our Combiner Box comes in handy.

To put things simply, a PV Combiner Box is an electrical unit that gathers the energy from multiple solar panel strings and combines it into a single direct current (DC) output. Inside the enclosure, each string connects to its own fused input, protecting the combiner box and downstream equipment from overloads. These individual inputs are then consolidated onto a common bus, allowing the combined current to flow out of the enclosure and toward an inverter.

Power Assemblies 400A, 1500V Solar Combiner Box with the enclosure's door opened to showcase internal components.

To top it off, our Solar Combiner Box is packed with extra safety features like a 400A integral disconnect, touch-safe fuse holders, and a Lexan shield that surrounds live components. By consolidating PV strings and protecting downstream equipment from electrical faults, our Combiner Box helps turn sunlight into usable energy.

Where Are Solar Combiner Boxes Used?

Industries

Since Solar Combiner Boxes help to simplify and scale solar systems, they’re a go-to for all kinds of applications. On utility-scale solar farms, they gather hundreds of PV strings spread across wide open fields and combine them into one output. This helps reduce long cable runs and boosts the overall efficiency of the system.

They’re just as important in off-grid and hybrid microgrids. Places like remote telecom towers, mining sites, or military bases rely on combiner boxes to safely manage DC power and protect parts of the system from electrical faults when needed.

Even in agriculture and public works, these boxes pull their weight. They’re used in solar-powered irrigation, water treatment facilities, and municipal infrastructure to provide you with a low-maintenance way to manage solar energy.

Regions

As solar energy transforms how we generate power, a few states are paving the way. California is leading the pack with a whopping 51.9 gigawatts (GW) of installed solar capacity (Fischer, 2025). In fact, solar energy now accounts for around 31% of the state’s total generated electricity (SEIA, 2025). Texas is close behind with 41.4 GW of solar power capacity installed and plenty of utility-scale solar farms spread out across the state.

Solar farm in foreground and Los Angeles, California, in the background on a sunny day.

Florida is also embracing solar power, with 18.6 GW currently installed. That number continues to grow steadily as demand for residential and commercial solar systems increases. Meanwhile, Arizona and North Carolina round out the top five, with 9.7 GW and 9.6 GW of installed solar capacity, respectively. Arizona is seeing a rapid adoption of residential solar, while North Carolina remains a key player in utility-scale solar.

Power Assemblies Solar Combiner Box: Key Features and Available Configurations

As the demand for solar power surges, our 400A, 1500VDC Solar Combiner Boxes are here to make your solar system more efficient. They let you use longer strings, streamline wiring, and ship pre-assembled to help you save on labor and installation costs. You can choose from NEMA 4X or NEMA 4 enclosures, and the box supports up to 19 inputs and 32A fuses.

Now, let’s take a little time to walk through our PV Combiner Box’s high-impact features and standard configurations:

Key Features:

  • Continuous Duty Rating: Operates seamlessly at up to 1500VDC.
  • Integral Disconnect: Available in 400A for added safety.
  • Touch-Safe Fuse Holders: Ensure user protection during maintenance.
  • Lexan Shield: Covers all live components for enhanced safety.
  • High-Temperature Output Terminals: Rated to operate at up to 90ºC.
  • Versatile Configuration: Designed for both positive and negative grounded arrays.
  • Certifications: ETL Listed to UL1741 standards.

Available Options:

  • Surge Protection: Prevent harm caused by electrical faults.
  • Compression Output Lugs: Secure electrical connection for cable terminations.
  • Installed Breather Vent or Drain: Prevent moisture buildup inside the enclosure, keeping components dry and corrosion-free.
  • Drilled Entrance Holes: Quickly and neatly route cables into the box, simplifying installation and saving time.
  • Installed Conduit Fitting or Cable Glands: Sturdy, weatherproof seal where cables enter the box.
  • Dual Output Lugs: Easy connection for two output terminations.
  • Lockable Enclosure: Avoid accidental exposure to live components and prevent tampering by unauthorized personnel.

Need something a little different? We offer custom configurations upon request!

Connect with us by emailing [email protected] or dialing (866)-825-8525 today, and we’ll work with you to create a PV Combiner Box that matches your exact plans and specifications.

Resources

  1. Kennedy, R. (2025, May 28). Electricity generation from U.S. solar grows 28% year-over-year. PV Magazine USA. https://pv-magazine-usa.com/2025/05/28/electricity-generation-from-u-s-solar-grows-28-year-over-year/?utm_source=chatgpt.com
  2. Future Market Insights. (2025, July 18). PV Combiner Box Market Size and Share Forecast Outlook 2025 to 2035. Future Market Insights. https://www.futuremarketinsights.com/reports/pv-array-combiner-box-market
  3. Fischer, A. (2025, April 25). Top five solar states grow in capacity and Investment. PV Magazine USA. https://pv-magazine-usa.com/2025/04/25/top-five-solar-states-grow-in-capacity-and-investment/
  4. SEIA. (2025, June 9). California. https://seia.org/state-solar-policy/california-solar