How to calculate the outdoor power supply time calculation formula

1. How many kWh is 1000Wh of Outdoor Power?

The answer is 1 kWh. A 1000Wh capacity means the power supply can deliver 1000 watts of energy for one hour, equivalent to 1 kWh.

EF ECOFLOW Portable Power Station DELTA 2, 1024Wh LiFePO4 (LFP) Battery, 1800W AC/100W USB-C Output, Solar Generator(Solar Panel Optional) for Home Backup Power, Camping & RVs, Check The Price >>>

How Long Can a 1000Wh Outdoor Power Supply Last?

The duration of usage for a 1000Wh outdoor power supply depends on the power needs of the devices you’re using. Higher-power outdoor power supplies can support more high-power devices and power more electronics simultaneously.

The larger the battery capacity, the longer the battery life for outdoor power supplies. An outdoor power supply with a 1 kWh capacity can support higher-power devices like rice cookers, electric ovens, and kettles.

---

2. How to Calculate the Runtime of an Outdoor Power Supply

Using a 1000Wh outdoor power supply, here’s how to estimate how many times it can charge certain devices or how long it can power others:

1. Number of Charges for Battery-Operated Devices (e.g., phones, laptops)

Formula:

Uses=power supply capacity×0.75device battery capacity\text{Uses} = \frac{\text{power supply capacity} \times 0.75}{\text{device battery capacity}}Uses=device battery capacitypower supply capacity×0.75​

• Example 1: A 50Wh laptop (powered off) $$1000Wh\times 0.75/50Wh\approx 15\text{ charges}$$

2. Charging While in Use (for devices in use while charging)

Formula:

Uses=power supply capacity×0.5device battery capacity\text{Uses} = \frac{\text{power supply capacity} \times 0.5}{\text{device battery capacity}}Uses=device battery capacitypower supply capacity×0.5​

• Example 2: A 50Wh laptop (in use while charging) $$1000Wh\times 0.5/50Wh\approx 10\text{ charges}$$

3. Runtime for Non-Battery Devices (e.g., fans, rice cookers)

Formula:

Runtime=power supply capacity×0.8device power consumption\text{Runtime} = \frac{\text{power supply capacity} \times 0.8}{\text{device power consumption}}Runtime=device power consumptionpower supply capacity×0.8​

• Example 3: A 60W projector (no battery) $$1000Wh\times 0.8/60W\approx 13.3\text{ hours}$$

4. Why Not Use the Simple 1000Wh / Device Capacity Formula?

Using 1000Wh / 50Wh for calculations would theoretically yield 20 uses. However, this doesn’t account for power losses due to the cooling fan, inverter, and other components in the power supply. After extensive testing, the adjusted formulas provided above offer a more accurate estimation of runtime.