I would like to install a 4k solar system with grid interactive inverter. Facts on inverters are not clear, I will use 99% grid tie but would like a battery back up for outages. Which inverter will allow me to operate on grid only with or without battery's? Also I would like to be able to switch off the system and not see any difference in powering the house from the grid. So far I have been looking at Outback and Xantrex, Xantrex looks like the one I need but I'm not clear on how they both operate.
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