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Message: <blockquote data-quote="binky" data-source="post: 554838" data-attributes="member: 490">Retrofit batteries not directly connected to an existing solar array will still charge batteries from surplus solar energy. All battery systems have an amp clamp or meter fitted at the incoming grid meter tails to monitor for surplus energy going to the grid. If they detect surplus energy, they charge the battery at the level of the surplus, effectively stopping energy 'escapin' to the grid. Likewise, if they detect energy being drawn from the grid, they release stored energy to match demand in your house.</blockquote>