Battery Storage Calculator
Size a battery storage system based on daily energy needs, backup duration, and depth of discharge.
Required Battery Capacity
37.5 kWh
Required Battery Capacity vs Daily Energy Requirement
सूत्र
## How to Size Battery Storage Battery systems are sized based on energy needs and desired backup duration. ### Formula **Usable Capacity = Daily kWh * Backup Days** **Total Capacity = Usable / Depth of Discharge** Depth of discharge (DoD) limits how much battery capacity you actually use. Most lithium batteries recommend 80-90% DoD to maximize lifespan.
हल किया गया उदाहरण
A home needing 30 kWh/day with 1 day backup at 80% DoD and $500/kWh battery cost.
- 01Usable capacity: 30 * 1 = 30 kWh
- 02Total capacity: 30 / 0.80 = 37.5 kWh
- 03System cost: 37.5 * $500 = $18,750
- 04Powerwalls needed: ceil(37.5 / 13.5) = 3 units
अक्सर पूछे जाने वाले प्रश्न
What is depth of discharge?
Depth of discharge (DoD) is how much of the battery capacity you use. An 80% DoD on a 10 kWh battery means you use 8 kWh. Lower DoD extends battery life.
How long do home batteries last?
Most lithium-ion home batteries are warranted for 10-15 years or 3,000-5,000 cycles. After that, they retain about 70-80% of original capacity.
Can batteries pay for themselves?
In areas with time-of-use rates, batteries can save $50-200/month by storing cheap off-peak electricity. Combined with solar, payback can be 7-12 years.