SCHOTT solar have a positive power tolerance only.
The weakest panel in the string defines the total capacity.
Ergo: With SCHOTT solar, I get what I pay for. Most solar panels have a negative power tolerance of up to -5%.
If you pay for a 1.5 kW system, it's very likely you'll end up with a 1.42 kW system. The bad thing, you'll never find out, unless you test each panel individually under standard test conditions.....
The difference with SCHOTT solar is, you have a positive power tolerance only. If you buy a 1.5 kW system, you will get a 1.5 kW system or potentially 3% more.
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