How Long Can a Solar Generator to Run a Computer 

Computers help you stay connected with family, friends, and colleagues. They can make your work easier, more efficient, and more enjoyable. But what happens when the power goes out? The good news is that you can use a solar generator to run a computer off-grid and keep it running for hours. 

Older models used up to 300 watts and the new high-performance desktop computer uses around 200 watts of power. This is quite higher compared to a TV or a laptop.

Choosing a Solar Generator for a Computer

The most important factor in choosing the right solar generator for your computer power is to match the wattage of your computer and the solar generator’s inverter. You will need a minimum of a 300-watt inverter in order to run your computer. You can go up to 500 watts with your inverter to support other appliances with your computer. 

To run a 200-Watt Desktop Computer you’ll need a 500-Watt Solar Generator. This Solar Generator will run the Desktop Computer for 2 hours. With the addition of a 200W solar panel, you can use the Computer for up to 6 hours in good sunlight conditions. 

How Long Will a 500-Watt Solar Generator Run a 200-Watt Computer?

The second thing to look at when choosing a solar generator is the capacity. Electrical energy is measured in Watt-Hours. This will determine how long the solar generator will run the computer.  

To calculate Watt-Hours you multiply the Wattage of the device or appliance and multiply by the number of hours you use the device. 

Watt-Hours = Watts X Hours 

If you want to use a computer for 1 hour, you will need 200 Wh of energy or 200 watts of power per hour. 

So this will help us determine how long a 500-watt solar generator will run the computer. 

A 500-watt solar generator with a 500Wh capacity will have a battery 24v 25Ah battery. With a lithium-ion battery, you can pull 50% of the battery in an hour. This means you can operate at max of 12 amps at a voltage of around 21V. This means the solar generator can only provide a maximum of 252 watts per hour. 

Our Computer falls 200 watts. This means that the solar generator has the capability to run the computer for hours.  

To calculate the running time of a desktop computer, you would use the following formula:

Running Time = Solar Generator Watt-hours/operating power of the device 

For example to get the running time for a 200-watt desktop computer

= (500*0.85)/200 

= 2.125 hrs

500 Watt-hours is enough to run the desktop computer for around 2 hours and 7 minutes.

How Long Will a 500-watt Solar Generator with a 200-watt Solar Panel?

With Solar Generators you have the option of adding solar panels to recharge the battery this adds to the capacity allowing you to run your appliances for longer. 

A 25Ah 24V battery will need 6 amps of DC power to charge. A 200-watt Solar panel can provide 6 amps to charge the battery in around four hours. This will depend on the availability of sunlight. 3 hours of sunlight in an ideal situation should provide 600Wh enough to fully recharge the solar generator and run the computer for up to 6 hours. Let me tell you why. 

The 200 watts from the solar panel can provide power to run the computer without denting the solar generator’s capacity. This is because the solar generator supports pass-through charging. This means with good sunlight conditions you run the computer for longer than 6 hours. 


In conclusion, using a 500-watt solar generator to run a computer can be an effective and environmentally friendly solution for off-grid or emergency power needs. While a 500-watt solar generator may not be sufficient to power all types of computers, it can be suitable for smaller laptops or desktops with lower power requirements. 

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