bess-sizing-toolkit

Dependency-free LFP storage sizing & ROI math — live demo. Every result shows its intermediate steps.

1. Battery capacity for backup

Includes chemistry-aware depth of discharge and an optional cold-temperature derate.

Load (kW)

Backup (hours)

Efficiency

Depth of discharge

Temperature factor

Required (nominal)—

After temperature derate—

Buildable configuration—

Inverter sizing (1.2×)—

Peak sun hours: central Russia 3–3.5 · SE Asia 4.5–5.5 · Middle East 5.5–6.5 · Southern Europe 4.5–5.5.

System size (kWp)

Peak sun hours (h/day)

Performance ratio

Annual degradation

Tariff per kWh

Self-consumption

Annual generation—

Monthly average—

Equivalent full-load hours—

Annual bill value—

10-year cumulative—

Static payback from the peak-to-valley tariff spread. Excludes demand-charge savings and degradation.

Capacity (kWh)

Peak price

Valley price

Total capex

Daytime load (kWh/yr)

Daily arbitrage saving—

Annual saving—

Static payback—

Self-consumption ratio—

MIT licensed · no dependencies · npm test runs 16 test cases