sleepyhead
Active Member
The whole talk about how SunPower cells are 21% efficient while rest of crowd is just 15%... It is very misleading and not close to reality.
SunPowers cells should be compared to monocrystalline solar panels, and they generally got 17%-19% efficient cells. With many actually exceeding 19% efficiency. Like cells from AOU, Sanyo, Jiawei...
And if you compare 21% to multiple cells on a market that are "only" 19% efficient, the difference is not that striking, as in the case if you would be comparing them to 15%. And yes, there are lots of offerings of monocristaline cells from China. But last time I have heard, most of SunPower cells were not produced in Western World too. Their biggest plant located in Indonesia or Philippines - somewhere there.
And such choice, basically sunpower lying outright, by choosing not the panels they actually compete against on the market, but lower end of polycrystalline solar panels, place a shadow on that whole crappy presentation SunPower pulled out...
The reason Sunpower is comparing its panels to "commodity" panels that are 15% efficient is because people don't understand why they should pay $1 for a Sunpower panel when they can get a "commodity" chinese panel for $0.60 (like the ones solarcity uses). Investors don't understand this either, and Sunpower held an analyst day to try to convince analysts/investors that they are going to succeed.
There are other manufacturers that make almost as efficient panels as Sunpower, but their costs are a lot higher than "commodity" panels (just like Sunpower's) and will not take away business from Sunpower in the US. Whereas the cheap Chinese commodity panels are taking away business from Sunpower in US, and that is why they compare their panels to commodity panels in their presentation.
Tesla is guilty of worse things in their presentations: such as using 300 mile range on Model S and comparing it to Nissan Leaf's EPA estimated of 73 miles. They should have used their own EPA estimated range of 265 miles instead.