Pre-filled with a typical $720/kWh rate for a 27kWh system — adjust to match your specific quote or chemistry.
Larger batteries typically cost less per kWh since fixed installation costs (labor, backup panel, permitting) spread across more capacity — this reflects that economy of scale, not a flat national rate.
A 27kWh battery is sized for whole-home backup or higher-usage households. Cost per kWh tends to decrease at larger capacities as fixed installation costs spread across more capacity — check your specific needs against the battery size calculator and outage duration against our duration-based sizing pages.
It depends entirely on your home's load — 27kWh usually covers most or all of a typical home for a meaningful outage duration; check your specific essential-circuit total with the battery size calculator to confirm.
Installation costs — labor, a backup panel, permitting — are largely fixed regardless of battery size, so they represent a smaller percentage of total cost as capacity increases, pulling the effective $/kWh down for larger systems.