For full system planning, use the WattSizing Calculator.
Quick Answer
During peak hours, mini splits often run at 700-1,800 W with the highest hourly cooling cost of the day.
Detailed Explanation
Even efficient inverter systems can ramp up in late-afternoon heat; TOU tariffs amplify cost impact. See How to Calculate Electricity Bill from kWh and How Many Watts Does a Mini Split Use.
Watt Table
| Peak Scenario | Running Watts | Peak kWh (4h) |
|---|---|---|
| Mild peak | 700 - 1,000 W | 2.5 - 3.5 |
| Hot peak | 950 - 1,400 W | 3.5 - 5 |
| Extreme peak | 1,300 - 1,800 W | 4.8 - 6.5 |
Calculation Example
1,200 W x 4 h = 4.8 kWh.
Tips
- Pre-cool before peak tariff window.
- Lift setpoint by 1C during peak.
- Shade windows on west-facing rooms.
- Shift other high loads to off-peak.
FAQs
Do TOU plans change mini split watts?
No, they change price per kWh.
Why are late afternoons most costly?
High load and high tariff overlap.
Can battery offset peak cooling cost?
Yes if charged from solar/off-peak grid.
CTA
Model TOU cooling cost in the WattSizing Calculator.
