Question about battery/ a.c. coupling to grid tie system

Question about battery/ a.c. coupling to grid tie system

My understanding is that in these systems, if the grid fails, the batteries take over to power the house.

But what if I want to take advantage of TOU or other peak demand charges?

I'm researching diy solar. Currently a microinverter 5.8kw system would end up costing under $1.5/w but I'd like to charge up a lion bank during the day, then discharge as the pv productions stops then charge up from the pv.

Is this only going to be done with some custom, expensive controller?

submitted by /u/turbodsm
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