Technology Package and Solar Sunroof Package

In the US, it's a hopeless endeavor - the technology package adds too much weight to be combined w/ the solar panels. Solar panels are good for around 62lbs. I believe you can partially mix this in other countries provided you're using 15" wheels.

Believe me - I "cried" too when the car was first released and realized I couldn't get both features together - I REALLY wanted the LED headlights, but my climate (AZ desert) justified the solar roof as a higher priority.

 

Sorry, correct - the panels add too much on top of the Prius Five, which is the only model to receive the Advanced Tech package. Prius 5 also adds 17" rims (which includes a different power-steering unit and steering rack in the US - quicker ratio, but reduced stroke to prevent the larger and heavier 17" rims from rubbing in the wheel wells) and LED headlights (and ECU) with washers. Add to that the radar cruise (and ECU), lane-keep assist (and ECU), and power seats of the Prius 4/5, and suddenly, 62lbs for the all-glass roof (and solar ECU and modified blower motor) may be too much considering GVWR with five 150lb adults and 75lbs of cargo (825lbs max passengers and cargo) of 3980 lbs.

Also keep in mind that significant weight increases may also require an EPA retest even if the platform could handle it. You can only have so much variance before the vehicle has to be categorized differently. Take the Hybrid Camry LE vs XLE with it's different numbers as an example. They didn't have to on Prius 5, even though it's well known in the community that FE suffers on those 17" rims (confirmed by the chief engineer too).