Choosing between a flexible and a rigid solar panel for an RV or van comes down to a trade between weight and heat. A 200W flexible panel such as BougeRV’s Arch Pro weighs about 7.9 pounds and is 2.5mm thick, per BougeRV’s listing, while a single 100W rigid glass panel like Renogy’s RNG-100D-SS weighs 14.1 pounds and stands 1.4 inches tall in its aluminum frame, according to Renogy’s datasheet. That difference in mass shapes everything else: how you mount it, how hot it runs and how long it lasts on the roof.
As an Amazon Associate I earn from qualifying purchases, at no cost to you.
I run the Arch Pro 200W on the off-grid setup that powers my Starlink, so the flexible side of this comparison comes from daily use. The rigid figures come from Renogy’s published datasheet. Where I calculate output or temperature effects, those are estimates.
Two real panels, compared
| Spec | BougeRV Arch Pro 200W (flexible) | Renogy RNG-100D-SS 100W (rigid) |
|---|---|---|
| Rated power | 200W | 100W |
| Size | 52.95 × 30.91 × 0.1 in | 41.8 × 20.9 × 1.4 in |
| Weight | ~7.9 lb | 14.1 lb |
| Weight per 100W | ~3.95 lb | 14.1 lb |
| Front surface | ETFE | 3.2mm tempered glass |
| Frame | None (fiberglass backing) | Anodized aluminum |
| Open-circuit voltage | 36V ±5% | 24.3V |
| Cell efficiency (maker claim) | Up to 25% | 17.8% module efficiency |
| Mounting | Adhesive, glue or hanging holes | Z-brackets, tilt mounts, rails |
| Bend | Up to 270°, per BougeRV | None |
| Temp. coefficient of Pmax | Not listed in the materials I have | -0.37%/°C |
Sources: BougeRV Arch Pro 200W listing; Renogy RNG-100D-SS datasheet.
Weight and roof load
For a van with a fiberglass high-top or a teardrop with a thin aluminum skin, weight is often the deciding factor. Per watt, the flexible panel in this table is about a quarter of the rigid panel’s weight. Covering 400W with Arch Pros would add roughly 16 lb of panel; covering it with four rigid 100W panels adds about 56 lb, plus brackets and hardware.
Rigid panels also raise the profile. At 1.4 inches of frame, plus a bracket gap, they stand several inches above the roof, which affects wind noise and clearance in parking garages. A glued flexible panel sits almost flush.
Heat: the reason rigid panels still win on many roofs
Solar cells produce less power as they get hotter. Renogy’s datasheet lists a temperature coefficient of -0.37% per °C for its rigid panel, meaning output falls by that share for every degree the cells rise above 25°C (77°F). A rigid panel on brackets has an air gap underneath that lets heat escape. A flexible panel glued directly to a dark roof has no such gap, so its cells tend to run hotter in summer.
Worked example (estimate)
Using Renogy’s -0.37%/°C figure for illustration: if a bracket-mounted panel’s cells sit at 45°C on a hot day and a glued panel’s cells reach 60°C, the 15°C difference works out to about 5.5% less output for the hotter panel (15 × 0.37). On a 200W array that is roughly 11W at peak. These temperatures are hypothetical; real figures depend on roof color, wind and climate.
A practical middle ground is to mount flexible panels on a thin, light substrate, such as corrugated plastic or an aluminum composite sheet, with a small spacer, to let some air move underneath.
Durability and lifespan
Rigid panels typically come with long performance warranties. Renogy, for example, lists a 25-year output warranty (95% at 5 years, 90% at 10 years, 80% at 25 years) and a 10-year materials warranty on its starter-kit panel, along with load ratings of 2,400Pa wind and 5,400Pa snow. Flexible panels are usually warrantied for far shorter periods, so check the specific product’s terms before you buy.
BougeRV says the Arch Pro’s ETFE surface resists scratches, sand and impact, which is an upgrade over older PET-faced flexible panels. Even so, glass and an aluminum frame are inherently tougher against hail and branches.
Mounting: what each panel needs
Flexible panels
- Clean and degrease the roof thoroughly.
- Use the method the maker approves: BougeRV lists adhesive backing, glass glue or hanging holes.
- Do not bend beyond the stated limit, and avoid repeated flexing once mounted.
- Seal cable entry points with a roof-rated gland and sealant.
Rigid panels
- Bolt Z-brackets or rails to roof racks or reinforced points.
- Seal every penetration with a self-leveling sealant made for your roof material.
- Consider tilt mounts if you park for long periods in winter.
Wiring and voltage: check your input limits
The Arch Pro’s 36V open-circuit voltage is higher than the typical 12V-class rigid panel’s 24.3V. BougeRV warns that this may not work with some power stations. If your controller or power station tops out at 28V, as BLUETTI’s Elite 30 V2 does, the Arch Pro is outside its window. In my build, the panel feeds an MPPT charge controller that accepts it without issue.
Worked example: series strings (estimate)
- Two Arch Pro 200W in series: about 72V open-circuit (2 × 36V), more on a cold morning because voltage rises as cells cool.
- Two Renogy 100W in series: about 48.6V open-circuit (2 × 24.3V).
Always check the cold-weather Voc against your controller’s maximum PV voltage, with a safety margin.
Which should you choose?
| Your situation | Better fit |
|---|---|
| Curved or fiberglass roof, weight-sensitive | Flexible |
| Stealth van, low profile wanted | Flexible |
| Full-time RV, hot climate, long service life | Rigid |
| Hail country or overhanging trees | Rigid |
| Roof rack already installed | Rigid |
| Hatchback, cargo box or awning top | Flexible |
Roof space and weight for a 400W array
Using the dimensions in the spec table above, the flexible Arch Pro covers about 11.4 square feet per 200W panel (52.95 × 30.91 inches), or roughly 17.6W per square foot. The rigid Renogy 100W covers about 6.1 square feet (41.8 × 20.9 inches), or about 16.5W per square foot. The two are close on power density. The big difference is weight.
| 400W build (estimate) | Flexible: 2 × Arch Pro 200W | Rigid: 4 × Renogy 100W |
|---|---|---|
| Panel count | 2 | 4 |
| Panel area | ~22.7 sq ft | ~24.3 sq ft |
| Panel weight | ~15.8 lb | ~56.4 lb, plus brackets |
| Roof penetrations | Usually one cable gland | Brackets plus a cable gland, unless you mount to a rack |
| Open-circuit voltage, 2 in series | ~72V | ~48.6V (2S), or 2S2P for four panels |
Four rigid panels also give you more layout options around vents and an air conditioner, because each panel is smaller. Two large flexible panels need two long, unbroken runs of roof.
Cold-weather voltage check (worked example)
Panel voltage rises as temperature drops, so a string that fits your controller in July can go over its limit on a frosty morning. The US National Electrical Code (Table 690.7(A)) gives a correction factor of 1.14 for a low of about 14°F (-10°C). Applied to the series strings above:
- Two Arch Pro 200W in series: 72V × 1.14 ≈ 82V. That is over the 75V limit of a 75V-class MPPT controller, but inside a 100V-class controller.
- Two Renogy 100W in series: 48.6V × 1.14 ≈ 55V. That fits a 75V controller with room to spare.
If your controller is a 75V model and you want flexible panels, wire them in parallel instead and size the cable for the higher current. Use your own panel’s datasheet and your area’s record low, not these sample numbers.
Daily energy you can expect (estimate)
A common planning shortcut is array watts × peak sun hours × about 0.75 for real-world losses. For a 400W array in a location with 5 peak sun hours, that’s 400 × 5 × 0.75 ≈ 1,500Wh a day. If the glued flexible array runs hotter and loses the roughly 5.5% from the heat example above during the middle of the day, the day’s total drops to roughly 1,420Wh. That gap is real but small. Shade from a roof air conditioner or a rack can cost far more, so placement matters as much as panel type.
Gear mentioned
- BougeRV Arch Pro 200W Flexible Solar Panel
- SunSwift 60A MPPT charge controller (the one in my setup)
- Renogy 100W rigid panel at Renogy
Related reading
- BougeRV Arch Pro 200W review: off-grid Starlink power
- Adjustable solar panel mounting brackets review
FAQ
Are flexible solar panels worth it for an RV?
Yes when weight, roof shape or a low profile matter most. Rigid panels are the better fit for long service life and hot climates, because they mount with an air gap.
Do flexible panels produce less power?
At the same rating and temperature, no. In practice, glued-down flexible panels often run hotter, and heat reduces output by a fraction of a percent per degree.
Can I walk on a flexible solar panel?
Avoid it unless the maker explicitly allows it. Point loads can crack cells even when the surface looks fine.
How do I attach a flexible panel without drilling?
BougeRV lists adhesive backing and glass glue for the Arch Pro. Clean the surface well and follow the maker’s cure times.
Will a 36V panel work with my power station?
Only if the power station’s solar input accepts it. Check the maximum input voltage; some compact units stop at 28V.
Can I mix flexible and rigid panels on one roof?
Yes, but put them on separate charge controller inputs or separate controllers. The Arch Pro’s 36V open-circuit voltage and the Renogy’s 24.3V don’t pair well in the same series or parallel string.
How much roof space does 400W need?
About 23 to 24 square feet of panel area for either type in this comparison, plus room to walk around the panels and keep them out of shade.
Do flexible panels need an air gap?
They don’t require one, but a thin backing sheet with a small spacer helps heat escape and can recover some of the output lost on hot days.