The old gray box XW's never really were designed for AC coupling. It
could be made to work with a xantrex grid inverter but most were told to
upgrade to the white box XW+ and XWpro.
I doubt anyone would notice the
XW+ or pro when it shifts a couple hz to protect the battery after it is
charged
Friends,
About seven years back I connected a dozen M215 Enphase inverters to our
battery backup system at home (Schneider XW4024 with 370AH battery bank).
The result was something that I would never want to duplicate for a
customer owing mainly to the flickering of lights during the daytime when
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