# Is a 120 Watt Solar Panel Enough?

A 120 watt solar panel can supply power to various appliances and equipment as long as their power is less than 120 watts per hour.

First, the operating time assumes that solar panels produce at least 100 watts of power per hour. If the output is lower, the runtime will be shorter. The load might not run at all if the output is too low.

We assume that the power of this notebook is 100 watts. If there is 6 hours of sunshine, the solar panel generates 100 watts of power per hour, and the laptop can run for 6 hours. But if the power of the laptop exceeds 120 watts per hour, the solar panel cannot run it. If there is only 4 hours of sunshine, the laptop can only run during this time. It is assumed that the battery panel generates at least 100 watts of power per hour.

The runtime assumes that you will not use these devices at the same time. If you do this, the available energy will be reduced. For example, if you run a 32 inch TV with a 120 watt solar panel, you won't be able to load anything else because it consumes almost 100 watts. If you have a USB mobile phone charger, you can use it to charge your mobile device and free up this panel for other applications. The solar panel can run any load as long as it is within the capacity range. Now we will look at how much power this panel can produce. Most 120W solar panels have a nominal rating of 12 volts, but it can reach 18 volts during a charge. By dividing watts by volts we can figure out the amps.

120 watts / 18 volts = 6.6 amps

A 120 watt solar panel at 18 volts produces 6.6 amps an hour under normal conditions.

Most solar cells only need 14.4 volts to charge, so you must install a charging controller to prevent overcharging and overload. Do not be confused why a 12V solar panel charges up to 18V. The 12 volts is applicable only when the panel is not producing current. When the sun shines on the solar panel, the battery starts to generate electricity and the voltage rises. The 120 watt solar panel is ideal for camping or with a limited budget. Under appropriate conditions, you can use it to run various devices.