R8KL1NA 48V Hybrid with Battery Backup when configured for Grid Tie

[RememberTheMagic]

when using the R8KL1NA 48V as a grid tie solution, is there anyway you can (even if manual) configure the until to use Battery when the Utility Grid goes down?

I realize you would need a transfer switch or the equivalent to isolate the utility grid so you don't back feed to the grid.