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Solar Battery Storage — What's Included
Add battery backup to your solar system — tesla powerwall, enphase, lg. Here's what a professional solar battery storage project actually includes, from consultation through interconnection.
Site Survey
Roof measurement, orientation analysis, shading study (Aurora Solar or equivalent), electrical panel assessment. Some installers offer virtual survey via satellite; others require on-site.
System Design
Panel layout, inverter selection, string sizing, conduit routing. You should receive a detailed design document showing every component + expected production.
Permitting
Installer files all permits with your municipality. Typical: building permit, electrical permit, sometimes structural review. HOA approval separate (installer usually guides).
Utility Application
Interconnection application filed with your utility. Approval typically 2-6 weeks depending on utility. Some utilities require a separate net-metering agreement.
Installation
Physical install: 1-3 days on-site for typical residential. Racking, panels, inverters, wiring, conduit, main panel work.
Inspection + PTO
City inspection (mechanical + electrical), then utility inspection, then Permission to Operate (PTO). System stays off until PTO is granted.
What to Expect at Each Stage
Realistic timeline for a typical 7 kW residential solar battery storage project:
- Week 1-2: Consultation, quote, contract signing
- Week 3-4: Site survey (in-person if needed), final design, permit application filed
- Week 5-8: Permit approval (varies wildly by city), utility interconnection application
- Week 9-10: Installation (1-3 days on-site)
- Week 10-12: City inspection, utility inspection, PTO granted, system turned ON
Fastest timelines are 6 weeks in cooperative cities. Slowest are 4+ months in bureaucratic ones. Ask your installer for their typical timeline in your city.
Cost Range (2026)
A typical residential solar battery storage project costs $13,000-$28,000 after the 30% federal tax credit, depending on system size, panel brand, inverter choice, and roof complexity. Get 3 free quotes to see your specific price.
Federal Solar Tax Credit
- Covers 30% of the total system cost (panels, inverters, batteries, labor, permits)
- You claim it on your federal taxes for the year the system is placed in service
- Non-refundable but can be carried forward if you don't owe enough tax
- Batteries qualify (Powerwall, Enphase IQ, LG Chem) even if not paired with new solar
Financing Options
Cash
Lowest total cost, best long-term ROI, immediate ownership. Requires $15k-25k upfront.
Solar Loan
Zero-down loans available, keeps tax credit for you. Rates 5-9% in 2026. Compare loan terms carefully.
Solar Lease / PPA
Zero down, installer owns system, you pay lower rate. You DON'T get the tax credit. Lower savings but lower risk.
HELOC
Home equity line at typically-lower rate than solar loan. Interest may be tax-deductible. You own the system.