4 ms·
It's one metric, not the only one. Im my residential installation, I was constrained by roof surface. Given certain subsidies, it would have made economic sense
by roel_v 7y ago
It's one metric, not the only one. Im my residential installation, I was constrained by roof surface. Given certain subsidies, it would have made economic sense for me to pay more per watt if that had meant I could have produced more overall (up to a point, of course).
- walrus01 7y agoUsing an example of current generation silicon cells, it certainly makes sense not to buy a lot of old technology polycrystalline 72 cell panels with a 300W rating, if you can buy mono si 72 cell 365-370W rated panels instead. There is only so much space on a house roof for a dozen or two dozen, 2.0 x 1.0 meter size panels. But beyond "top grade 156mm mono cells", such as you can get in a new 360W stc rated panel, there is significantly diminished returns in dollars per watt. Yes you can get sunpower 23% efficient panels but they will literally cost twice as much.
- cheerlessbog 7y agoYes if your goal was to be as independent from the grid as possible. My guess is most people putting them on their roof mostly care about minimizing their long term energy expenditure net of costs.