What solar alone does in an outage, which is nothing
A standard grid-tied inverter disconnects when the grid goes down. That is a safety requirement, so that a solar array does not energise lines that utility crews believe are dead.
The consequence surprises more homeowners than any other fact about solar: after a storm, a house with panels on the roof and no battery is as dark as one without.
Backup requires a battery plus an inverter and switching arrangement designed for it. That should appear in a quote as specified equipment, not as an assurance that the system will keep you going.
Ask precisely which circuits would be backed up and for how long under a realistic load. The answer should be a list of circuits, and in a Louisiana summer it should say explicitly whether air conditioning is on that list.
Sizing for a multi-day outage
A battery sized for an evening and a battery sized to ride out several days without grid power are different products at different prices.
The good news in a hurricane scenario is that the days afterwards are often sunny, so a battery paired with solar can recharge each day rather than draining once and stopping.
The complication is load. Air conditioning in a Gulf Coast summer is a heavy continuous draw, and a battery that comfortably runs a fridge, lights and fans may not run cooling for long.
Ask for the backup scenario modelled explicitly: which loads, for how many days, with what daily solar recharge assumed. That converts a promise into a specification you can check.
What the battery does the rest of the time
Under the Commission rules, electricity you consume as it is generated costs you nothing while electricity you export earns avoided cost, near 3 cents per kWh against a retail average around 12.
A battery captures midday generation that would otherwise be exported at avoided cost and releases it in the evening, upgrading each of those kilowatt hours to the retail rate you would otherwise pay.
That four-to-one gap makes the everyday arbitrage genuinely worthwhile here, which is not true in states that credit exports at or near retail.
Ask for the system modelled with and without storage so the incremental value appears as its own number, and ask how the configuration balances everyday cycling against holding charge in reserve for storm season.
What is left to build the number from
The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025, so a cash or loan purchase receives no federal tax credit on the panels or the battery, and Louisiana state credit expired on December 31, 2017.
Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements, so ask what a provider claims and what reaches you in the rate.
What exists is the property tax exemption, full retail value for self-consumed generation, and avoided-cost compensation for exports at your utility published rate.
Ask for the backup scenario specified as circuits and days, the battery value shown separately from the resilience benefit, and both priced so you can see what each is costing you.