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Solar pumping system accessories

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Q: What is the purpose of a surge arrestor?
A: It protects against nearby lightning strikes and thunderstorms
Q: When should you use a sine wave filter?
A: With an external frequency drive connecting to a motor higher than 380VAC
Q: When is a thin film solar panel a better solution than a crystalline solar panel?
A: In cloudy conditions
Q: How many cells does a typical solar panel consist of?
A: Between 36 and 72 panels