Free tool
Bank Sizing · Runtime Scenarios · Charge Time Estimates
Buying too few cells leaves you short on backup capacity. Buying too many wastes money you didn’t need to spend. This calculator takes your daily load, system voltage, and cell specs — then gives you the exact bank configuration, how long it’ll last under different loads, and how long it’ll take to recharge from solar, grid, or a generator.
How to use this calculator
Step 01
Enter your system inputs
Provide your daily energy demand in Wh, your system voltage, cell Ah rating, depth of discharge, autonomy days, and system losses.
Step 02
Set your charge source
Choose solar, grid charger, or generator and enter the relevant specs. This calculates how long it takes to refill your bank from near-empty.
Step 03
Read your results
Get your bank configuration (series × parallel), usable kWh, runtime at different load levels, and charge time estimates for each source.
LiFePO4 Battery Bank Calculator
Bank Sizing · Runtime · Charge Time
Eneronix
Your Energy, Our Precision
01
System inputs02
Charge source for charge time calculation☀ Solar (MPPT)
⚡ Grid charger
⚙ Generator
Results
Section 1 — Bank sizing
Required capacity
—
Ah @ system voltage
Usable energy
—
kWh usable
Total cells needed
—
LiFePO4 cells
Section 2 — Runtime scenarios
Section 3 — Charge time
Design minimums only. Always round up to the next standard commercial Ah rating available in your market. Charge times assume charging from near-empty (~10% SoC). LiFePO4 typically accepts bulk charge at 0.5C — at lower C-rates, actual charge time will be longer. Consult a qualified engineer before installation. © Eneronix — eneronix.com
Understanding your results
Required capacity (Ah)
The minimum amp-hour capacity your bank needs at your chosen system voltage to cover your load for the set autonomy days, accounting for DoD and system losses.
Usable energy (kWh)
The actual energy your bank can deliver to the load. This is the installed bank capacity multiplied by your depth of discharge — what you can actually use before recharging.
Runtime scenarios
How long your bank lasts at 100%, 75%, 50%, and 25% of your average daily load. Useful for load-shedding planning and understanding your real backup window.
Charge time
How long it takes to refill your bank from near-empty using your chosen charge source. Solar charge time is given in solar days — actual elapsed time depends on weather and season.