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Our conclusion is: If you need life support or a server on your
property, go with batteries, otherwise use a direct grid-tie system.
In a grid-tie system, the grid acts as the battery. Excess electricity
produced in the daylight turns your meter backwards as it feeds
out to the grid. At night your meter turns forward as you use the
electricity from the grid. Due to seasonal fluctuations of sunshine,
the utility company uses a net metering system. Net metering is
simply an annual billing cycle rather than monthly. A perfect system
would leave your meter at zero each year.
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