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Old 02-13-17, 08:42 AM
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Just FYI, it will take about 1200 sq. in. (about 1 sq meter) of high-quality cells to charge a typical 48V 12Ah battery in 5 hours of full sun. Most of the relationships are linear, so if you cut the panel size in half, you'll get half as much charge (or a full charge will take twice as long).
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