Home battery storage is transforming how households use electricity. Paired with solar, batteries let you store excess daytime generation for use at night or during outages. Even without solar, batteries can reduce demand charges and provide backup power. Here's how battery storage works and when it pays off.
How Home Batteries Work
Battery systems store electricity in chemical form and release it when needed. With solar, excess production charges the battery instead of (or in addition to) exporting to the grid. When the sun sets or demand spikes, the battery discharges to power your home. Modern systems use lithium-ion technology, similar to EVs, with 10–15 year warranties and high round-trip efficiency (85–90%).
Benefits of Battery Storage
Backup power during outages is a major draw—critical for those in wildfire-prone or storm-affected areas. Financially, batteries can reduce demand charges for homes on time-of-use rates, store solar for peak periods when export credits are low, and in some regions participate in grid services programs that pay for battery dispatch.
- Backup power during grid outages
- Peak shaving (reduce demand during expensive hours)
- Maximize solar self-consumption
- Participate in utility demand response programs
- Reduce reliance on the grid
Costs and Incentives
Home batteries cost roughly $7,000–$15,000 for a 10–15 kWh system, installed. The federal ITC now includes battery storage when paired with solar, reducing cost by 30%. Some states and utilities offer additional rebates. Economics vary—batteries often make the most sense where outages are frequent, time-of-use rates are steep, or net metering credits have been reduced.
When Batteries Make Sense
Consider batteries if you experience frequent outages, have time-of-use rates with high peak prices, live in an area with weak or changing net metering, or want energy independence. For many homes, solar alone delivers the best return; batteries add resilience and can improve economics in specific rate structures.
"Batteries aren't just for backup. In markets with time-of-use rates, storing solar and discharging during peak hours can double the value of each kilowatt-hour you produce."
Sizing Your System
Battery capacity is measured in kWh. A typical home might use 20–30 kWh per day. A 10 kWh battery could power essential loads (refrigerator, lights, internet) for several hours. For full backup, size for your critical load and desired runtime. Work with an installer to model your usage patterns and rate structure.
Batteries Without Solar
Standalone batteries can charge from the grid during off-peak hours and discharge during peak—a strategy called "arbitrage." This works best with large rate differentials. Some utilities also offer programs that pay customers to allow grid dispatch of their batteries during high-demand periods.
Battery technology is improving and costs are falling. Use ElectriBill to understand your usage patterns, then evaluate whether storage fits your goals for savings, resilience, or independence.