📋 Smart Energy Planner

Optimise your energy usage around the Octopus Cosy tariff • Heat pump, battery & appliance scheduling

⚡ Select Your Tariff & Season
🔋 Battery Schedule - Octopus Cosy (Winter)
⚡ CHARGE
22:00-00:00 + 04:00-07:00
@ 14.33p/kWh
🔌 DISCHARGE
16:00-19:00
saves 43.83p/kWh
🎯 MODE
Self-consume
💡 Cosy Strategy: 8 hours of cheap rates! Charge 22:00-00:00 (evening), top-up 04:00-07:00. Peak avoidance spread: 29.5p/kWh saved.
⚙️ Your Settings
°C
°C
to
💷 Octopus Cosy Rates
🌙 Cosy Rate
14.33p
22:00-00:00 + 04:00-07:00
8h per day
☀️ Day Rate
29.22p
Standard hours
⚡ Peak Rate
43.83p
16:00-19:00
3h per day - AVOID!
🧠 Smart Strategy
🔋 Battery Strategy (18.8kWh Hanchu)

✓ Charge During Cosy

  • 04:00-07:00 - Pre-dawn charge (3 hours)
  • 13:00-16:00 - Afternoon top-up (3 hours)
  • 22:00-00:00 - Evening charge (2 hours)
💡 8 hours of cheap charging = ~28kWh capacity (more than battery needs)

⚡ Discharge During Peak

  • 16:00-19:00 - Use battery power only
  • ~3kW average household = ~9kWh needed
  • Battery can easily cover this (16.9kWh usable)
💰 Saves: ~£2.66/day avoiding peak rate
🔥 Heat Pump Schedule

Constraint: Heat pump and hot water can't run simultaneously

☀️ Day Mode (19.5°C)

06:00 - 23:00
  • Pre-heat during morning Cosy (04:00-07:00)
  • Let thermal mass carry through day rate
  • Boost during afternoon Cosy (13:00-16:00) if needed

🌙 Night Mode (18°C)

23:00 - 06:00
  • Lower setpoint = less energy needed
  • Pre-heat starts at 04:00 (Cosy rate)
  • House warms up before you wake
🚫 Peak Avoidance (16:00-19:00): Pre-heat house to 20°C during afternoon Cosy (13:00-16:00), then coast through peak on stored heat + battery power.
🚿 Hot Water Schedule

Heat water during Cosy periods when heat pump isn't running at full demand

🌅
05:00 - 06:30
Primary slot (Cosy rate)
🌇
14:00 - 15:30
Afternoon boost if needed
🌙
22:30 - 00:00
Evening backup
💡 Immersion heater: Use as backup only during Cosy periods if heat pump can't keep up. At 3kW, costs ~43p per hour on Cosy vs ~88p on Day rate.
💰 Potential Savings
Daily Savings
£4.43
With smart scheduling
Battery: £2.66 + Behaviour: £1.77
Monthly Savings
£132.75
Estimated
Annual Savings
£1,615.13
Estimated
📌 Quick Reference

✅ DO (Cosy Times)

  • Charge battery (04:00-07:00, 22:00-00:00)
  • Run washing machine/dryer (13:00-16:00)
  • Heat hot water (05:00-06:30)
  • Pre-heat house before peak (13:00-16:00)
  • Charge EV overnight (22:00-07:00)

❌ AVOID (Peak: 16:00-19:00)

  • Running high-power appliances
  • Heating water (use stored hot water)
  • Heavy cooking (use microwave if needed)
  • Charging anything from grid
  • Heat pump boost cycles

☀️ Solar Bonus

  • 13:00-16:00 = Cosy rate + solar peak
  • Use solar directly, store excess in battery
  • In summer: may have free power all afternoon
  • Battery fully charged by 16:00 for peak