with a grid tied inverter as soon as you lose the grid power you lose power from that array
are you doing a 40 kw system or is that a drawing you found. a few months ago my boss finished a 108KW off grid battery system on the iron market in porta prince hatie.
will your power company pay you for power? this is i guess the deal breaker if they will then yes use grid tied if no then do energy efficient upgrades to reduce power consumption and size a battery system to match. btw our company travles to install.
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2 ton geo unit 2400' HDPE slinkey
4KW solar with battery backup
$8.98 power bill
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