See what a home battery actually costs — equipment vs. installation — before you talk to an installer.
Installation cost scales with complexity — a straightforward add-on to existing solar wiring is far cheaper than a full backup-panel retrofit.
Further reading: Solar Battery Storage 101: Sizing, Cost, and Whether It's Worth It
Equipment price varies significantly by brand and chemistry — lithium (LiFePO4) commands a premium over lead-acid per rated kWh, but delivers far more usable energy per dollar because of its higher safe depth of discharge and longer cycle life. Installation cost is the piece most online calculators ignore entirely; a battery added to an already-solar-wired home with a simple AC-coupled setup can cost half what a full backup-panel retrofit with a licensed electrician's rewiring does.
Many battery systems include a hybrid inverter/charger in the equipment cost; standalone battery-only add-ons to an existing inverter usually don't. Check your quote's scope and adjust the equipment rate above if needed.
Run the number here through the Battery ROI Calculator to see the payback from time-of-use arbitrage, or the Battery Backup Runtime Calculator to weigh it against the value of outage protection.