CIGS vs. Rigid: The Ultimate Solar Shading Test

I put two 200-watt solar panels head-to-head: a BougeRV Yuma 200 CIGS flexible panel and a standard BougeRV rigid mono panel. My goal was to see how they stacked up, especially when facing the real-world challenge of partial shading. The CIGS panel's performance in less-than-ideal conditions was truly surprising.

What I Built

For this comparison, I set up a straightforward test in my backyard. I used an **Anker Solix C1000** portable power station to measure the input from each panel. First, I connected the **BougeRV 200W rigid mono panel**, positioning it for optimal sun exposure. Then, I swapped it out for the **BougeRV Yuma 200 CIGS flexible solar panel**. Both panels were rated at 200 watts. My initial tests were conducted around high noon on a clear, cool day to ensure peak performance conditions.

Once I established baseline full-sun output, I introduced various shading scenarios using trash cans and natural tree shadows, as well as a simulated RV roof setup. The aim was to mimic common situations where solar panels might experience partial shade, which often drastically impacts their efficiency.

Why It Works

The stark difference in performance under partial shade between the CIGS flexible panel and the rigid mono panel comes down to fundamental differences in their cell structure and bypass diode implementation. Standard rigid solar panels typically have strings of cells connected in series. If even one cell in a string is shaded, the entire string's output can be severely reduced, acting like a bottleneck for the whole panel. This is often mitigated by bypass diodes, but they can only do so much when a significant portion or an entire row of cells is blocked.

CIGS (Copper Indium Gallium Selenide) thin-film technology, on the other hand, is designed with a high number of very small cells and more robust bypass diode configurations. This allows the panel to 'bypass' shaded sections more effectively, letting the unshaded portions continue to produce power. In essence, the CIGS panel is much better at isolating shaded areas, preventing a single shadow from obliterating the entire panel's output. This makes them incredibly resilient in dynamic shading environments, like under trees or around roof-mounted equipment.

Parts & Specs

Here are the key specifications for the panels I tested:

• BougeRV Yuma 200 CIGS Flexible Solar Panel:
  • Maximum Power (Pmax): **200W** (±5%)
  • Max Power Voltage (Vmp): **25V** (±5%)
  • Max Power Current (Imp): **8.02A** (±5%)
  • Open Circuit Voltage (Voc): **31.5V** (±5%)
  • Short Circuit Current (Isc): **8.64A** (±5%)
  • Max System Voltage: **1000V DC**
  • Operating Temperature Limits: -40°F to +185°F (-40°C to +85°C)
  • Weight: **5.95 lbs** (2.7 kg)
  • Warranty: **10-year** limited warranty
  • Mounting: Drilled holes for mounting or adhesive installation
• BougeRV 200W Rigid Monocrystalline Solar Panel:
  • Rated Power: **200W** (similar specs to the flexible panel where applicable)
• Portable Power Station: Anker Solix C1000

Math & Run-Time Numbers

The real-world tests yielded fascinating results:

• Full Sunlight (Both Panels): Both the CIGS and rigid panels performed nearly identically, inputting around **173-175W** into the Anker Solix C1000. This is expected, as they are both 200W panels under ideal conditions.
• Single Trash Can Shade (CIGS): With a trash can casting a shadow over a portion of the CIGS panel, the input dropped to **110W**.
• Single Trash Can Shade (Rigid): The same trash can shadow on the rigid panel caused a dramatic drop to just **14W**. This is a stark difference in partial shade resilience.
• Double Trash Can Shade (CIGS): With two trash cans creating more extensive shade, the CIGS panel still managed **26W**.
• Double Trash Can Shade (Rigid): The rigid panel's output further plummeted to **11W** with the increased shade.
• Tree Shade, Flat Orientation (CIGS): Lying flat under dappled tree shade, the CIGS panel produced **10W**.
• Tree Shade, Flat Orientation (Rigid): Under identical tree shade conditions, the rigid panel yielded **11-12W**. In heavy, full shade across the entire panel, both perform poorly.
• Partial Horizontal Shade (CIGS): When I set up a scenario where half the panel was shaded horizontally (simulating a roof overhang), the CIGS panel produced an impressive **67W**.
• Partial Horizontal Shade (Rigid): The rigid panel in the same horizontal partial shade scenario only generated **16W**.
• Vertical Fold (CIGS): Even when folded into a vertical U-shape, with significant self-shading, the CIGS panel still managed to produce **25W**. A rigid panel cannot even attempt this.

Pros & Cons

Based on my testing, here's how the BougeRV Yuma 200 CIGS flexible solar panel stacks up:

Pros:

• **Exceptional Partial Shading Performance:** This is the standout feature. The CIGS panel maintains significantly higher output compared to rigid panels when partially shaded.
• **Flexible and Lightweight:** It can bend and conform to various surfaces, making it ideal for non-flat installations. At just under 6 pounds, it's incredibly portable.
• **Durable & Weatherproof:** The video demonstrated its flexibility, and it's rated for outdoor use in rain and other weather.
• **Low Profile & Stealthy:** Its thin design makes it less noticeable, perfect for stealth camper van setups or situations where you don't want visible solar panels.

Cons:

• **Price:** Currently, CIGS technology is more expensive than traditional rigid panels, making it less accessible for mass adoption.
• **Full Shade Limitations:** While excellent in *partial* shade, if an entire section or row is completely blocked, its performance will still drop significantly, just like any solar panel.

When To Use This vs. Alternatives

The **BougeRV Yuma 200 CIGS flexible solar panel** truly shines in specific scenarios where traditional rigid panels fall short. If you're outfitting an **RV, camper van, or any mobile setup** with curved surfaces, its flexibility and low profile are unbeatable. It's also a game-changer for **car camping or portable power station users** who frequently find themselves under dappled shade from trees or structures.

I've personally had terrible luck with folding portable panels, which often fail at the creases. The CIGS panel offers a durable alternative for on-the-go power without the worry of folds breaking down. Its ability to maintain substantial output in partial shade means you don't have to constantly reposition it for optimal sun, unlike rigid panels. However, for large, fixed installations with consistent, unobstructed sunlight, rigid panels might still be the more cost-effective choice due to their lower upfront price.

Bottom Line

I'm genuinely impressed with the **BougeRV Yuma 200 CIGS flexible solar panel**. Its performance in partial shading is a significant advantage over rigid panels, making it an excellent choice for anyone needing flexible, lightweight, and resilient solar power. While the current price point might be a barrier for some, the benefits for specific mobile and off-grid applications are clear. This technology is definitely headed in the right direction for real-world energy independence.

Final Wrap-Up

If you found these real-world tests helpful, please give this post a like and consider subscribing to my YouTube channel for more hands-on reviews and DIY solar projects. Got a question about CIGS panels or want to share your own experiences? Sound off in the comments below! And don't forget to check out my gear page for links to all the equipment I use and recommend.