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How much is Changzhou Tianhe Hanergy Photovoltaic 3KW photovoltaic power generation? Can I use it on cloudy days and at night?

When the system is installed, it is almost 10~ 12 yuan per watt, and it can also be used in cloudy night, because the electricity generated during the day will be stored in the battery, so it can also be used in cloudy night. If it is connected to the grid, even if the battery is dead on cloudy days, you can still use the mains electricity, and there will be no power outage anyway.