EquipmentUp to date · Jan 15, 2026
Battery Storage
A system that stores excess solar energy for use when the sun isn't shining, providing backup power during outages.
Why It Matters
Batteries let you use your own solar power at night, avoid peak TOU rates, and keep critical loads running during blackouts. They're increasingly cost-effective as prices drop.
Real-World Example
A 13.5 kWh Tesla Powerwall can keep essentials (fridge, lights, WiFi, phone chargers) running for roughly 8-12 hours during an outage.
Related Tools
Related Terms
Off-Grid System
A solar system with battery storage that operates independently from the utility grid, requiring full self-sufficiency.
Time-of-Use (TOU) Rate
An electricity pricing structure where rates vary by time of day. Peak hours (usually 4-9 PM) have higher rates.
Load Profile
A pattern of your electricity usage throughout the day and year. Important for sizing solar and battery systems.