Whole-Home Solar Battery Backup

How to size and configure a solar + battery system to power your entire home during grid outages.

Key Specifications

Avg Home Daily Usage	30 kWh
Min Battery for Whole Home	20-40 kWh
Recommended Solar Pairing	8-12 kW system
Essential Loads Only	10-15 kWh battery
Transfer Switch	Required for backup
Typical Install Time	1-2 days additional

Pros

+Complete energy independence during outages
+Powers all appliances including HVAC
+Solar recharges batteries during the day
+Potential to go fully off-grid
+Peace of mind during storms

Cons

-Requires 2-4 battery units ($20K-$50K)
-Larger solar system needed to recharge
-More complex electrical work
-May require main panel upgrade
-Higher maintenance needs

Best For

Homeowners in areas with frequent outages, extreme weather, or those wanting complete energy independence.

Average Cost

$25,000-$50,000 for full whole-home system

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