Time will tell us where is the true.
Sunpower already reached 24% efficience in semi flexible solar cells. They have solar panels for home, more expensive than average but more durable, the loss of efficience per years it's much lower than low cost solar panels, the the lifespan it's much higher and helps compensate the higher price.
The battery breakthrough, well... the "glass electrolity" it's alread almost a breakthrough itself, since it allows to create lithium metal bateries instead of lithium ion batteries without fire hazard.
What they need to demosntrate now it's about the alleguetions of increased energy density after hundreds cycles, the sodium batteries with similar perfomance, and the use of lithium in cathode and anode. And of course, the allegations about self charge.
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Originally Posted by redpoint5
I've seen no evidence of a battery breakthrough.
There is nothing to suggest PV panels will achieve 30% efficiency in residential applications.
None of the huge problems have been resolved.
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