Interested in your calcs to arrive at this for a grid tied scenario.
LiFePO4 Battery (not including inverter)
16 cells for 48V battery, 280 Ah, $100 each plus $500 BMS
13440 Wh, $2100 is $0.16 per Wh
lifespan 3500 cycles, 1000 Wh/kWh, $0.045/kWh of cycle life.
I haven't picked a battery inverter for peak shaving. My off-grid Sunny Island has MSRP $0.85/W (although I paid less.)
People have used them to backfeed grid from stored power, not sure how they tricked it into doing so.
There are Schneider, Sunny Boy Storage, others.
Some of those (which are grid-forming for off grid use) are priced around $0.40/W.
GT PV inverters can be used, but need separate charger.
Sunny Boy Storage appears to be a grid-tied inverter programmed for bidirectional use.
Separately, cost of PV:
7.7 kW inverter and 9250 W (STC) of PV panels
5.5 hours effective sunlight on average
42.35 kWh/day, 155,000 kW in 10 years
$1800 for inverter, $0.35/W panels costs $3225
$5035 not including rack mounts and electrical.
$0.033/kWh amortized over 10 years.
Maybe replace inverter once, $0.022/kWh over 20 years.
Mounting hardware and electrical could add 50% or 100% to cost (PV panels no longer dominate system price.)
I think people elsewhere in the country pay as little as $0.05/kWh from the grid?
In my area, time of use rates range from $0.28 off-peak to $0.42 on-peak making arbitrage with batteries somewhat attractive. For EV users, $0.18 to $0.50 so more compelling. Either way PV and net metering looks good (until they jack up monthly fees and charge $70 to $100/month for having a PV system.)
I don't think utility will let you do that storing power you buy from them, but you can store what you generate from PV while powering your house from the grid (so to comply you need to regulate battery charging so it matches production.)