I found it on a 2 minute video. But they only say 30watts. No...

I found it on a 2 minute video.
But they only say 30watts. No other information.
They say they can save 40% on a power bill but again, no other information.

Playing around with some solar calculators, I just can't figure our how they get to that number.

Your numbers are BS too.

The efficiency rates drop off so fast from the ideal direction of sunlight, it's not funny.
Your 3.5 hours at max 30 watts is laughable. Here's why. Maximum solar efficiency in somewhere like Sydney is only for 40 minutes.

Also, we don't know if they measured the 30 watts at 30 degrees which is ideal pitch in Sydney at the ideal time of day (in the 40 minute window for max efficiency) OR if it was vertical ie 90 degrees.

So is real maximum power 30 watts or 19.5 watts on a window facing north for 40 minutes?

There are so many variables and no where near enough information to work out if this 40% saving was for someone living in a glass house with gas cooking, gas heating and gas hot water LOL or a normal full electric house with no gas??

They will have to produce an online calculator for architects and energy efficiency contractors to use to help people work out the payback, or how many kilograms of carbon they keep from putting in the atmosphere using the product. The carbon saving will be an easier sell.