I have three solar systems that I have built. First, don't believe the wattage figures advertised.  You will be fortunate to get about half of the wattage advertised for maybe 5 hours a day. Your installation will not even be close to their laboratory testing.  Cloudy overcast and rainy days drastically cut production. For instance, my largest system has double the number of panels recommended. There are 4 250 watt panels The panels have a very long life and are now cheap enough to double up. Th
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