What Size Solar Generator Do I Need? (2026 Guide)

Choosing the right solar generator can feel confusing at first. With so many sizes, capacities, and power ratings available, it's not always obvious which portable power station will actually meet your needs.

The good news is that determining the right size is fairly straightforward once you understand three key factors:

1. The devices you want to power

2. How long you want to run them

3. The battery capacity required

This guide explains how to calculate your energy needs and choose the right solar generator for camping, home backup, or off-grid use.

Step 1: Identify the Devices You Want to Power

Start by listing the devices you want your power station to run.

Common examples include:

• Smartphones

• Laptops

• LED lights

• Portable refrigerators

• Wi-Fi routers

• CPAP machines

• Small kitchen appliances

Every device uses electricity measured in watts (W).

You can typically find the wattage on the device label or power adapter.

Step 2: Understand Watts vs Watt-Hours

Two measurements determine solar generator size.

Watts (W)
How much power a device uses at any given moment.

Watt-hours (Wh)
How much energy a battery stores.

Example:

A 100-watt laptop running for 5 hours requires:

100W × 5 hours = 500Wh

So you would need a power station with at least 500Wh capacity to run that laptop for five hours.

Step 3: Estimate Your Daily Energy Needs

Here are typical energy requirements for common devices:

Example weekend camping setup:

• Phone charging: 40Wh

• Laptop: 200Wh

• LED lighting: 60Wh

• Portable fridge: 500Wh

Total daily need:

~800Wh

A 1000Wh solar generator would comfortably support this setup.

Step 4: Match Capacity to Use Case

Small Solar Generators (200–500Wh)

Best for:

• Phone charging

• Laptops

• Small electronics

• Short camping trips

Mid-Size Generators (500–1500Wh)

Best for:

• Camping and overlanding

• Portable refrigerators

• Workstations

• Multi-day trips

Large Solar Generators (1500Wh+)

Best for:

• Home backup power

• Extended outages

• Running appliances

• Off-grid living

Solar Charging Considerations

Many modern solar generators include MPPT charge controllers, which optimize solar panel charging.

Typical recharge times:

Solar charging allows you to extend runtime indefinitely when sunlight is available.

Explore Solar Generators

You can browse portable power stations currently available at:

https://www.reservepowerco.com/collections/portable-power-stations

Reserve Power Co. focuses on reliable portable energy solutions designed for outdoor use, home backup, and off-grid applications.

FAQCan a solar generator run a refrigerator?

Yes. Most portable refrigerators consume between 300–600Wh per day, meaning a 1000Wh generator can power one for roughly 24 hours without recharging.

Are solar generators safe indoors?

Yes. Because they use batteries instead of fuel combustion, they produce no carbon monoxide and are safe for indoor use.

How long do solar generator batteries last?

Many modern power stations use LiFePO4 batteries, which can last 3,000–4,000 charge cycles before noticeable degradation.

Final Thoughts

Selecting the right solar generator comes down to understanding your energy needs. By calculating device wattage and runtime requirements, you can confidently choose a portable power station that delivers reliable power wherever you need it.