Four Things You Should Know about Adding Battery Backup to Solar
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There is a shortcoming with grid-tied photovoltaic (PV) energy systems of which owners are often unaware until an emergency: Although grid-tied systems can save money and earn their owners incentives while the sun is shining and the utility power grid is up, they must disconnect when the grid is down during an outage, leaving unused solar electricity sitting on the roof. As a safety feature within generic grid-tied systems, when the grid is down, users can neither sell energy back to the utility, nor supply their homes or businesses with power per the UL-1741 safety requirement.
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