RV Battery Bank Sizing Calculator (Ah & kWh)

Calculate the required storage capacity for your daily budget and desired autonomy. Size individual battery modules to compute the exact series/parallel layout, estimated weight, cycle life, and cost.

Daily energy useWh / day

Days of autonomydays w/o sun

Battery Chemistry

Depth of Discharge80%

10%SafeModerateAggressive100%

System Target Voltage

// Individual Battery Module Specs

Module capacityAh

Module Voltage

// Cost Estimator (Optional)

Cost per battery$ per unit

// Output

Required capacity313Ah @ 12V

Required energy3.75kWh

Battery modules4× 100Ah / 12V

Wiring layout1S × 4P (parallel only)

Actual bank400Ah

Actual energy4.80kWh

Est. weight120 lbs / 54 kg

Est. cycle life3,500cycles

Est. lifespan9.6years (1 cycle/day)

Bank Layout (1S × 4P (parallel only))

100Ah

← PARALLEL STRINGS →

LiFePO4: Safe to 80-90% DoD. 3000+ cycles typical.

Lead-Acid/AGM: Limit to 50% DoD. Cold temps drop capacity 20-30%.