Battery Sizing

Battery Storage Sizing Intro

Battery Storage Sizing

Solar Design Calculator: Size solar + battery storage systems with depth of discharge optimization for maximum lifespan. Calculate battery capacity, usable vs total energy, inverter requirements, and cycle life expectations for LFP (Lithium Iron Phosphate), NMC (Nickel Manganese Cobalt), and Lead-Acid chemistries. Supports quick mode for simple kWh-based sizing or advanced mode with detailed load profiling, critical backup loads, and self-sufficiency analysis for residential and commercial installations.

System Overview
Your installed or planned solar capacity
Average daily consumption (check utility bill)
How much solar energy to store vs export
Optional: Hours of backup power needed
Battery Configuration
Chemistry affects lifespan and depth of discharge
Lower DoD = longer battery life (auto-set by chemistry)
Load Details

Add individual loads to calculate peak power demand and optimize battery/inverter sizing.

Sizing Results

Recommended Battery Capacity

-

Usable Capacity

-

Total Capacity

-

Peak Power Demand

-

Inverter Size Needed

-

Battery Life & Performance

Expected Cycle Life

-

Expected Lifespan

-

Self-Sufficiency

-

Daily Cycles

-

Calculation Details
-
About Battery Sizing
Battery sizing for solar+storage systems balances daily energy needs, self-consumption goals, and backup requirements. Usable capacity depends on chemistry-specific depth of discharge (DoD) limits—LFP batteries can safely discharge to 90-100%, while lead-acid should stay above 50% to maximize cycle life. The battery must be sized for both daily cycling (self-consumption) and peak demand events (backup power). Inverter capacity should exceed peak load by 25% for safety margin. Proper sizing optimizes return on investment by matching storage capacity to actual usage patterns and minimizing grid dependency.