How Long Will a Solar Generator Power My Devices

Matthew Miller
Apr 16
2 min read

A solar generator can power your devices anywhere from a few hours to several days, depending on its battery capacity, the wattage of your devices, and whether you recharge it with solar panels.

What Affects How Long a Solar Generator Lasts?

There are three main factors that determine runtime:

1. Battery Capacity (Watt-Hours)

Solar generators are measured in watt-hours (Wh), which tells you how much energy they can store.

300Wh → Light use for several hours
500 to 1000Wh → Moderate use for a full day
1000Wh+ → Extended use or multiple devices

The higher the capacity, the longer your generator will last.

2. Power Usage (Watts)

Every device uses a different amount of power.

Phone → 5 to 10 watts
Laptop → 50 to 100 watts
Mini fridge → 60 to 100 watts

The more power your devices use, the faster your generator will drain.

3. Solar Recharging

If you’re using solar panels, you can recharge your generator during the day.

This can:

Extend runtime significantly
Allow for multi-day or continuous use
Reduce reliance on pre-charging

Real-World Examples

Here’s what a typical setup might look like:

Phone charging → 20 to 50 charges
Laptop → 5 to 10 hours
Mini fridge → Several hours to a full day (depending on size)

For longer trips, pairing your generator with solar panels helps maintain power throughout the day.

How to Estimate Runtime

A simple way to estimate how long your generator will last:

Battery Capacity (Wh) ÷ Device Wattage = Estimated Runtime

Example:

500Wh generator ÷ 50W device = ~10 hours of use

This gives you a rough idea of what to expect.

Tips to Make Your Power Last Longer

Use energy-efficient devices
Turn off devices when not in use
Charge during the day with solar panels
Choose a generator with slightly more capacity than you need

Choosing the Right Setup

If you only need to charge small devices, a compact solar generator will work well. For longer trips or powering larger items, a higher-capacity unit paired with solar panels will give you more flexibility and reliability.

Offgridr offers a range of portable power solutions designed to keep your devices running wherever your off-grid lifestyle takes you.

What size portable power station do I need?
https://www.getoffgridr.com/post/what-size-portable-power-station-do-i-need
What devices can I run with a portable power station?
https://www.getoffgridr.com/post/what-devices-can-i-run-with-a-portable-power-station