How Many Kwh Does a 100W Solar Panel Produce?

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Solar panels today come in all shapes and sizes, but 100W kits remain popular for many reasons. They are portable, lightweight and can be used in different ways. But how much power can you get from a 100W solar panel? And what devices can you run with it?

A 100 watt solar panel can produce 0.5 kwh per day with 5 hours of sun. The amount of sunlight determines how many kilowatts the solar panel can generate, so more sun hours is going to lead to higher output.

How Much Power Can a 100 Watt Solar Panel Produce?

A 100W solar panel can yield up to 100 watts an hour. However this is the maximum output the panel can produce in ideal conditions. In real world situations, the output would probably be 280W to 290W on most days, and drop off during the cold season.

Solar power production will be lower on the morning, reach its peak at noon and go down again in the afternoon. This may vary depending on the season and your location though. Other factors that affect production are the following.

A solar panel with high efficiency is the easiest way to get maximum output. Our choice is the Top Solar 100W Solar Panel Kit since it works for different setups including RVs, boats and off grid homes.

There are many reasons why solar panels do not always produce according to their rated output. But basically, the rated output is for peak sun which only occurs at noon. During the rest of the day the sun’s angle and intensity will change, and so will the panel’s energy production.

  • Solar panel orientation. Panels oriented true south have higher outputs. Otherwise production will be lower.
  • Season. Obviously 100W solar panels perform better during summer than winter.
  • Geography. Solar panels in sunny states like Nevada, California and Arizona can produce 450W to 480W a day because the sun is aplenty. On the other hand, New York, Vermont and colder states may yield only 300W or so a day.

Because there are many elements that affect solar panel output, you must adjust your expectations of what a 100W module can produce. The longer the days and the more sunlight available, the higher the production. As the days shorten during the cold season, output will drop.

What Can a 100W Solar Panel Run?

A 100W solar panel can run a laptop, light bulbs, a fan, a mobile charger and other small devices. How many you can run at the same time depends on the device wattage requirements and output of your solar panel. Twenty 100W solar panels is good for 2800 kwh annually, assuming the panels are oriented true south and ideal weather condition.

An energy efficient laptop may require 60W to 70W. You can run that on the panel plus a couple of 5W LED bulbs. Or you can power up a 35W fan while using your computer. Even if it doesn’t reach 100 watts an hour, there will be no problem charging mobile devices. A 100W module works great as a portable solar charger too.

What you can run on a 100W solar panel also depends on its output. If it is close to peak capacity you can mix and match the devices as long as it doesn’t exceed the panel production. You cannot run an air conditioner , microwave or kitchen fridge because those appliances need more power.

Usage depends on available power. As long as the panel generates sufficient watts for the connected devices, they will keep running. but if the supply is cut or slows down (due to passing clouds for instance), your device will stop working. That is why it is better to use a solar panel with a deep cycle battery.

Can You Connect a 100W Solar Panel to a Battery?

Yes, you can connect a solar panel to a battery and you should. Solar panel production varies during the night and stops at night. On a grid tied system this is not an issue as you have access to electricity. However, any extra power your panel has produced will be wasted.

By connecting the solar panel to a battery, energy is stored and can be used at a later time. You could run your devices off the panel during the day, and use the stored energy in the battery at night.

You can also run your devices from the battery instead of the panel. While solar panel production fluctuates, energy in the battery is constant. It is more convenient and safer to run electronics on a consistent power supply, so using batteries makes sense.

There are two kinds of batteries you can use, lead acid and lithium. Lithium is further divided into two categories, AGM and gel. We have a detailed comparison here , but the most important thing to remember is lead acid batteries can only be used up to 50% before needing a recharge.

If you use up 400W a day, your lead acid battery capacity must be 800W. Lithium batteries have a better discharge rate, up 75% or more depending on the manufacturer. However you do have to pay more for it.

You can connect any battery to a 100 watt solar panel, but for starters you can go with 100ah. Our pick is the Weize 100ah 12V AGM battery since it is reliable and charges quickly.

Can You Combine Several 100W Solar Panels?

You can combine several 100W solar panels to generate more energy. Connect two 100W solar panels for 200W, or three 100W for 300W and so on. You can combine solar panels in series or parallel.

In a series, you connect the positive end of a panel to the negative end of the next panel. With this setup, the voltage increases but the amps remain constant.

In a parallel connection, all the panel positives are connected to the positives, and the negatives to the negatives. The amps increase but the voltage remains the same.

Some configurations include series and parallel elements. Your installer will determine which is most ideal for your system.

Can You Connect a 100W Solar Panel to a Solar Generator?

A solar panel can be connected to a solar generator and used to recharge the unit. However, PV modules are not always required for solar generators though they are compatible.

A portable solar generator or solar power station is basically a battery. You charge it via an AC wall outlet, DC or solar panel and it runs whatever device you connect to it. Generators have multiple inputs and outputs and capacity ranges from a few hundred watts to some large enough to power a house .

Because solar generators can be charged by AC power, a solar panel is not required. Many power stations don’t have solar panels built in but you can hook up one easily. Most people charge their generator with AC and use the system while camping. If the power runs low that’s when you can use a solar panel to recharge the unit.

There are many types of solar generators, some with more features than others. Check first if it is compatible with your 100W solar panel or if there is already one built in. You may also need more than 100W to recharge the generator, depending on its capacity.

Can a 100W Solar Panel Run an RV?

If you will only run basic devices / appliances, a 100W solar panel is enough for an RV. But you will need additional power sources to run a fridge and other appliances. Most RVers require at least 200W along with a generator for backup power.

You can use this guide to calculate how many solar panels your RV demands. in brief, you should calculate how many watts you will need and also how you use your RV (for weekend trips, boondocker, living in it etc.).

Always make sure there is reserve power in case of emergency. If your total watts usage is 300W, you should have 3 x 100W solar panels plus a battery with about 400W capacity. If you are going to use a fridge, welding tools or other powerful appliances, better have a gas generator as those electronics will consume too much solar power.

Can a 100W Solar Panel Run a House?

Several 100W solar panels can run a house, but it is not practical. Most homes need a 5 kwh or 10 kwh system to run everything, and that means 100W solar panels numbering 70 to 100 or more.

Installing several panels will be complicated. There will be more racks, mounts, bolts etc. Solar panels need space so installing a hundred or so is difficult. The more modules installed, the more wires, connectors etc. that could trip, loosen or short.

Solar panel costs have also gone down so it is cheaper to buy a 400W solar panel than four 100W modules. So while 100W panels have many uses, running an entire house is not one of them.

100W Single Panel vs, Solar Panel Kits

There are basically two types of 100W solar panels you can buy, the module only or a complete kit. A module consists of a single 100W panel, while a kit includes the 100W panel, charge controller, brackets and cables.

If you already have a solar panel system and just need to add another 100W, buy the single module. If you want to install a solar panel on your RV or house and don’t have anything installed, the kit is a better option. It comes with everything you will need to be up and running. With proper safety precaution you should have no problems installing it.


Although 250W and 300W solar panels are now popular, 100W modules are still commonplace and have many uses. From powering electronics to appliances, there are many ways to use 100W solar panels alone or with other modules.