Battery Tariff Arbitrage Calculator
Estimate signed energy savings per cycle and year from your battery, rates and cycling frequency.
A QUICK WALKTHROUGH
How to use this tool
- Enter your battery, rates, currency and weekly full-cycle count.
- Optionally add efficiencies to compare, then calculate.
- Copy the report or download it as TXT.
Formula and units
Each cycle buys B = capacity × DoD/100 kWh and delivers D = B × efficiency/100. Cost = B × charge rate; replaced value = D × peak rate; signed net = value − cost; annual net = net × cycles/week × 52; break-even peak = charge rate ÷ (efficiency/100).
Scope
Assumes all delivered energy replaces peak-rate purchases and the same full-cycle pattern repeats for 52 weeks. Negative savings remain negative. Excludes degradation, wear, standby draw, inverter overhead, export, load scheduling and purchase cost. Break-even is a per-kWh rate, including when capacity or cycling is zero. No recommended inputs or lifetime assumptions.
Local processing
Your entries stay in your browser. Copy and TXT export include the inputs, formula and scope.
GOOD TO KNOW
Common questions
How should I use the result?
Use it as an arithmetic estimate based on your supplied inputs.