Join Date: Sep 2007
Location: Pasadena Md - Magothy side
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I remain a skeptic. Not in their ability to print a solar panel, but in just how efficient it is.
1000 homes running off 10 acres - they don't mention the batteries to run the houses during night, but we'll skip that part.
That's 435600 square feet (10 acres), now one could assume that 1/1000 of that being 435 square feet one could simply paste a nanosolar array to the roof of an average house and power the puppy up. Of course you'd have to clean the roof daily to keep bird poop, leaves and such from turning off your Air conditioner.
If anyone could do that, they would have done it.
They cite a 14.5% cell effectiveness, IIRC the norm is close to 6%; if they are in fact twice as efficient.
Rough numbers, my 80w panel is roughly 7 sq ft, it would take 62 of them to cover 435 sq feet.
On a good day I've observed 3ah at 13.6v going into the batteries (the MPPT reduces the 16-17v down, ah up).
3ah x 62 = 186ah at 13v, rounding off in favor of them (and ignoring conversion to AC loss) we'll call that 18ah at 110v, and then we'll double that because they say their cells are more efficient.
40ah, 110v, per hour at best, curved over time (panel won't be 100 effective during all 10 hours of daylight) and let's be nice and say it makes 300 amp hours per day at 110v.
My fridge uses 13amp 13x24 = 312.
Nuff said? or is my math grossly wrong (I admit to being poor at math).
I'm not saying it's not good, just saying it's not ready, not without a whole LOT more efficiencies being applied pandemically.