To private message, you click on someone's name, then "Start Conversation".
But the discussion of how to store and use battery power rather than net meter is useful for others.
We can use PM for any more personal data if necessary.
What's holding up final approval from building inspector?
Do you have NEM 2.0 reservation with utility? Because if not, I would think you would be connected under NEM 3.0, "Solar Billing Plan", which is not net metering.
If you have daytime loads like A/C, simply offsetting those is beneficial. Have to evaluate whether cost of battery system for night time consumption is worth additional expense.
Sunny Island with Sunny Boy is very good for offgrid or grid-backup.
What it doesn't appear to support is charging and discharging battery to shave peaks, aiming or zero export.
I and another forum member are in that boat now, about to get pushed onto NEM 3.0 after 20 years of net metering. And we have Sunny Island.
SMA does sell a product for this, Sunny Boy Storage. The basic unit hooks up much like a Sunny Boy, except it gets battery not PV, it uses an external energy meter (WattNode) with CT around wires feeding from utility to your property. It optionally communicates with Sunny Boy.
SBS can charge to reduce or eliminate exports, discharge to reduce or eliminate imports.
An optional "ABU" lets it provide backup when grid is down, for select loads placed downstream of it.
Downsides to SBS include expensive HV batteries, wimpy surge (can't start motors larger than about 2kVA +/-, can't parallel for more power when grid is down.
SI is a powerful, high quality, and expensive inverter, but you can find heavily discounted ones new or slightly used on eBay (due to DC Solar bankruptcy.) It can probably be set up to operate as an off-grid inverter, powering downstream loads from PV and battery, then connecting to grid if battery gets low. If you use it off-grid this way, then your SB won't offset any daytime loads that aren't downstream. It could power your entire house if 56A pass-through and 50A 120/240V from battery is sufficient. 2x SI has 22kVA surge, enough to start 4kVA or so motor.
Officially supported lithium batteries for SI are also expensive, but there are some cheaper commercial batteries (PowerPro) that reportedly work, also DIY.
As I wrote earlier, easiest and cheapest way to use battery is to buy a hybrid that supports a cheap battery and uses CT to sense grid connection.