Complete the Strategy Wizard first to see your personalised savings breakdown.
Complete the Strategy Wizard first to see your personalised daily schedule.
⚠️ Disclaimer: This tool provides estimates for illustration only. Actual savings depend on your specific tariff rates, battery efficiency, solar generation, usage patterns, and weather. Tariff rates shown are approximate and may change. Always check your actual tariff rates on your energy supplier's website. This is not financial advice — consult a qualified advisor before making investment decisions.
Maximising savings on Agile or Go. If you're on a time-of-use tariff, the key to saving money is charging your battery when electricity is cheap and discharging when it's expensive. The optimiser calculates the exact strategy for your battery size and tariff, showing you the cheapest possible way to run your home.
Deciding whether to charge from the grid or rely on solar. On cloudy winter days, your solar panels might not generate enough to charge your battery. The optimiser shows whether it's cheaper to top up from the grid during cheap hours or wait for solar. On Agile, prices can go negative. meaning you get paid to charge.
Comparing battery sizes before buying. Not sure whether to get a 5 kWh or 10 kWh battery? Run the optimiser with both sizes to see the difference in annual savings. A larger battery costs more but captures more cheap electricity. the optimiser shows whether the extra capacity is worth it.
It depends on your evening/nighttime usage. A typical UK home uses 8–10 kWh from 4pm to 8am. A 5 kWh battery covers the evening peak; a 10 kWh battery covers overnight too. If you're on a cheap overnight tariff like Go, you may only need a small battery to cover the evening peak.
Yes. this is a generic optimiser that works with any home battery. It doesn't control your battery directly (you'll need your battery's app for that), but it tells you the optimal times to charge and discharge for maximum savings.
Modern lithium batteries typically last 6,000–10,000 cycles (15–20 years). Cycling once per day, that's 16–27 years. The optimiser's strategy of one full cycle per day is well within battery lifespan. Avoiding deep discharge (below 10%) and high temperatures extends life further.
This is a standalone calculator, not connected to Octopus. Use it to plan your strategy, then set your battery's charge/discharge schedule in your battery management app or the Octopus app. Some Octopus tariffs (like Intelligent Go) automate this for you if you have a compatible battery.
Yes. All calculations run in your browser.
Most battery calculators just show simple "charge at night, discharge in the evening" strategies. This one uses actual half-hourly tariff prices (where available) to find the truly optimal strategy. On Agile, prices change every 30 minutes. the optimal charge window might be 02:00–04:30 one day and 11:00–13:00 the next. This tool shows you when.
It's also independent. not tied to any battery brand or energy supplier. Works offline, no sign-up, no tracking.
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