What's the difference between AC and DC battery systems?
DC batteries connect directly to solar panels before the inverter, offering higher efficiency but requiring compatible inverters. AC batteries connect after the inverter and work with any solar system but have slightly lower efficiency due to multiple energy conversions.
How much does a home battery cost?
Home battery systems range from $10,000-$20,000 installed, depending on capacity and features. Popular options like Tesla Powerwall (~$15,000 installed) offer 13.5 kWh capacity. Federal tax credits apply to batteries when installed with solar systems.
Can I add a battery to my existing solar system?
Yes, batteries can often be retrofitted to existing solar systems, though the process varies by system type. String inverter systems may require additional equipment, while systems with power optimizers or microinverters typically integrate more easily with battery storage.
What's the lifespan of a solar battery?
Most lithium-ion solar batteries last 10-15 years or 6,000-10,000 charge cycles. They typically retain 70-80% capacity after their warranty period ends. Proper installation, temperature control, and usage patterns can extend battery life.
How long will a solar battery power my home?
Battery runtime depends on your energy usage and battery capacity. A typical home battery (10-13 kWh) can power essential loads (lights, refrigerator, internet) for 8-24 hours, or run a whole home for 4-8 hours during normal usage patterns.
Why should I add a battery to my solar system?
Solar batteries store excess energy generated during the day for use at night or during power outages. They provide energy independence, backup power during blackouts, and can help you maximize your solar investment by reducing reliance on grid electricity during peak-rate periods.
