[Gbarringer100]

I only had a glass roof from the first of January, that 4 months that lets the glass show and not the solid headliner. It is a daily driver and do not see any real pro or cons so far. Waiting on summer getting here and then I might have a comment if the sun shines in to much or lets the car head up when parked in the sun or then the roof I had on the 171 to the older 172 that did not have a glass roof but a solid panel.

Saw somewhere MB later started coating the inside of the glass that if you changed the headliner to expose the glass it was blacked out. Did this to claim to make it cooler. Think it more to stop people from not ordering the panoramic sunroof and then change the headliner and save money.

 

[Gbarringer100]

> Was showing 39'c in the shade, in our back yard....

Using an old 5Watt car Solar Panel and a DVM set to Amps, I measured the following on the 11th August @ 12:50pm with the car facing SSE: (or the sun ~ 45' to the right when looking out the windscreen)

• Solar Panel on outside of Windscreen = 162mA
• Solar Panel on inside of Windscreen, flat against glass = 102mA (Shows the Tinted Windcreen works!)
  
  
• Solar Panel on outside of side window (~45' to sun) = 135mA
• Solar Panel on inside of Windscreen (~45' to sun) = 67mA (Again, the side window is tinted)
  
  
• Solar Panel on outside of R172 Panoramic Glass Roof, pointing straight up = 146mA
• Solar Panel on inside of Panoramic Glass Roof = 0mA

View attachment 597335
(Though I've never tested at what point the Solar Panel "Shuts-Down"?)

Just for comparison, You'd need 7 of the 5W Solar Panels to cover the Windscreen (7 x 102mA x 12.4v = 8.85 Watts)
Then about 2.8 Solar panels to cover the side window (2.8 x 67mA x 12.4v = 2.33 Watts)

In your windscreen you mention it being tinted. Is that the standard OEM or has it been tinted beyond that? In the USA we can not add a tint to the windscreen unless you have a doctor's prescription to tint the windscreen. Side windows depending on state laws the front seat windows may or may not be tinted. Tint depending on state law again can be from 0% to 70%. Wonder if a reflective window tint that would do anything. I know on my house windows it does reduce the temperature in the room compared to plain glass.

 

[Gbarringer100]

You can tint in many US states without prescription as long as it's fairly transparent (usually 70% visible or better).

Sent from my SM-G781U using Tapatalk

You are correct on the side and rear windows no prescription, you can tint the top 3 to 5 inches of the windshield with no prescription but to tint the entire windscreen (windshield) requires a prescription to tint them otherwise no tint.

 

[Gbarringer100]

Interesting, here is what shows online for Texas, per the Texas Department of Public Safety: You could do a clear entire windshield un-tinted (#5).
Windshield
Sunscreening devices can be applied to the windshield if all of the conditions below are met.

1. Sunscreening devices must be applied above the AS-1 line. If there is no AS-1 line, sunscreening devices must end five inches below the top of the windshield.
2. Sunscreening devices may not be red, amber, or blue in color.
3. Sunscreening devices, when measured in combination with the original glass, must have a light transmittance value of 25% or more.
4. Sunscreening devices, when measured in combination with the original glass, must have a luminous reflectance value of 25% or less.
5. A clear (un-tinted) UV film is allowed anywhere on the front windshield without a medical exemption being required.

It goes on to say there can be exceptions;
ACQUIRE A MEDICAL EXEMPTION

Motorists must obtain a signed medical exemption statement from a licensed physician or licensed optometrist, which should:

• Identify with reasonable specificity the driver or occupant of the vehicle; and
• State that, in the physician's or optometrist's professional opinion, the equipping of the vehicle with sunscreening devices is necessary to safeguard the health of the driver or occupant of the vehicle.

 

[Gbarringer100]

Yeap #10 is what allows to do the whole windshield, minimum transmission is 70% or 80% if I recall correctly.

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Not sure where you see #10 and where you base your recall. Here is the website for Texas.

Window Tinting Standards | Department of Public Safety

www.dps.texas.gov

 

[Gbarringer100]

Apology accepted. That was stated in my post #15 in the first two lines.

 

[Gbarringer100]

This one on ebay MERCEDES SLC W172 FOLDING ROOF TRIM PANEL BLACK (16-19) | eBay , how much was yours from main dealer ?

At the bottom of the web page under the item specifics, it shows the part number A17279000459H23