Inverter Runtime Table: Runtime by Battery energy
Reference table of runtime for Inverter Runtime across a range of battery energy values — exact, engine-computed figures you can read off at a glance.
Inverter Runtime Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Runtime
5.10
- In minutes
- 306
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Inverter Runtime Calculator
The Inverter Runtime Calculator works out your runtime, along with 1 related figure in an instant. Enter battery energy, inverter efficiency and load and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the battery energy.
- Enter the inverter efficiency.
- Enter the load.
- Read off your runtime, together with in minutes — the calculator updates automatically, with no button to press.
Formula
The Inverter Runtime Calculator uses the formula:
Runtime = Battery energy × Inverter efficiency ÷ 100 ÷ Load
Worked example
For example, with battery energy of 1,200 Wh, inverter efficiency of 85% and load of 200 W, the runtime is 5.10.
| Battery energy | 1,200 Wh |
|---|---|
| Inverter efficiency | 85% |
| Load | 200 W |
| Runtime | 5.10 |
|---|---|
| In minutes | 306 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
Multiply battery energy by efficiency and divide by the load. A 1,200 Wh battery at 85% powering 200 W lasts about 5.1 hours.
Inverters lose some energy as heat, often 10–15%, so usable energy is less than the battery's rating.
No. Many batteries last longer if you use only part of their capacity, so reduce the energy figure accordingly.
Add the wattage of every device running. Labels list watts, or multiply amps by volts.
The Inverter Runtime Calculator uses the formula: Runtime = Battery energy × Inverter efficiency ÷ 100 ÷ Load. For example, with battery energy of 1,200 Wh, inverter efficiency of 85% and load of 200 W, the runtime is 5.10.
Enter the battery energy. Enter the inverter efficiency. Enter the load. Read off your runtime, together with in minutes — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Inverter Runtime: Formula, Steps & Examples
Learn how to calculate Inverter Runtime — the formula explained step by step, with worked examples and a free calculator to check your answer.