The cost of solar panels is now low enough to be a secondary factor for residential use. In USA and Western Europe, the cost of installing is the biggest expense, also the cost of batteries (for off-grid). In Europe there is also the availability of good quality MPPT, batteries (LiFePO4), converters - there is a lot of 110V equipment on Amazon, not 230V.
So in the overall picture, for residential installations the cost of the solar panels is not an issue, people in Europe can afford to pay a premium for German-made panels. If the efficiency is higher, that premium is well deserved, I know the efficiency of solar panels is continuously increasing, today we have more than 50% more efficient panels than 10 years ago and those were 50-100% more efficient than another 10 years ago (the base was very low, it allowed for such huge increases).
So in the overall picture, for residential installations the cost of the solar panels is not an issue, people in Europe can afford to pay a premium for German-made panels. If the efficiency is higher, that premium is well deserved, I know the efficiency of solar panels is continuously increasing, today we have more than 50% more efficient panels than 10 years ago and those were 50-100% more efficient than another 10 years ago (the base was very low, it allowed for such huge increases).
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