100-Watt Solar Panel-Everything You Need To Know

100-watt solar panels are very popular, the main reason for this is because they are conveniently sized and portable.
They work great in off-grid settings like RV,s and to power several smaller appliances. In this post, I am going to answer a few questions about the 100-watt solar panel.

How big is a 100-watt solar panel?

Typically, 100-watt solar panels have some measures of around 47×21.3×1.4 inches. 100-watt solar panels are much smaller than most solar panels that are used in homes.

How many batteries can a 100-watt solar panel charge?

If you use a 100 Ah 12V battery, you should be good to go with only one battery.  The number of batteries that a 100-watt solar panel can charge will depend on the size of the battery.
Typically one 100 watts solar panel can charge a 100Ah, 12V with ease, it may take a longer time to charge larger batteries or more batteries.
What will a 100-watt solar panel run?
A single 100-Watt Solar Panel can power up several small electrical appliances such as cell phones, lamps, fans on ceilings, routers of wifi, laptops, and other small devices.

Here are some electricals that will run with a 100-watt solar panel.

  • Ceiling fans.
  • Lamps and lighting.
  • Laptops.
  • WiFi Routers can be powered for a whole day.
  • LED lights.
  • Charge smartphones or tablets.  
  • Small LCD TV set.
  • Cable box and satellite dish.
  • Printers.
  • Alarm clocks.
If do you want to know how many of them it can run at the same time, just look at the power specification of each device, add that power, make sure the sum is less or equal to 80 watts ( we estimate 10-20 watts loss due to wiring and inverter).

How long does it take to charge a 12v battery with a 100-watt solar panel?

It can take between 10 to 14 hours to fully charge a 12V with a 100-watt solar panel. The exact time it would take to charge the 12V battery will depend on the capacity of the battery (Ah) and the sunlight exposure.

How many volts does a 100-watt solar panel produce?

Most 100-watt solar panels produce about 18V, this is a Direct Current(DC), if you want to use it in Alternating Current (AC) you will an inverter.

How many amps does a 100-watt solar panel produce?

A 100-watt solar panel will produce approximately 5.5 Amps.
A 100-watt panel will produce approximately  18 volts of maximum power voltage. If you take 100 watts and divide by 18 you will get approximately 5.5 Amps.
If do you want to know how many amps-hour it will produce, just take the answer we got above (5.5 Amps) and multiply by the average sunny day in your area.
If you are located in an area with an average of 5.5 sunny days a 100-watt panel will produce an average of about 30 amp-hours per day (based on an average sunny day).

How many watts does a 100-watt solar panel produce?

The power output of a 100-watt solar panel depends on a few factors. The amount of sunlight, the angle of the solar installation, the shadow on the solar panel, and if the solar panel is dirty all these factors will influence the output.

Assuming an average of 5.5 sunny days, you should expect your 100-watt solar panel to produce about 500 watts per day on average.

How much is a 100-watt solar panel?

Typically a 100-watt solar panel will cost you under $100, if you want a full 100-watt kit it will cost you $300 or more. You can get it from Amazon here.

What size inverter for a 100-watt solar panel?

In order to calculate the size of your inverter, you need to take the power output of your solar panel and multiply it by a 1.2 factor. You need to pick an inverter that has the power capacity above that answer.

An inverter of 200 watts that can convert 12 DC to 220 AC, can work with the 100-watt solar panel without any issue.

Note: If you are from a country that uses 110 Ac, just pick a 200 watts inverter that converts 12 V DC to 110 V AC.

What size battery for a 100-watt solar panel?

The power output of your solar panel should match the power input of your battery, in this case, I would recommend a 12v, 100Ah battery for a 100-watt panel.

What gauge wire for a 100-watt solar panel?

The size of the wire is calculated based on the voltage drop allowed in your country, most countries will allow a voltage drop of 2% to 3%.

I recommend the maximum of 2% of the voltage drop between the solar panels and the inverter and a maximum of 3% of the voltage drop between the inverter and the appliances.

Solar power typically needs a 12 gauge AWG wire, though the cable size may differ based on specific factors, like resistance, the distance between the panel and the inverter, and flow.

Will a 100W solar panel run a fridge?

In theory, a 100-watt solar panel can run a mini-refrigerator for a short time. Normally mini-refrigerators have a power rating of 60-80 watts.
The reason I said, in theory, is that to start a refrigerator you need at least 4 times of it is nominal power, so to start an 80-watt refrigerator you will need at least 300 watts and the 100-watt solar panel will not be able to provide that.
Let’s say you started a refrigerator, to run it for a day with a combined freezer you will need about 2000 watt-hours per day, while the 100-watt solar panel will produce about 590 watt-hours per day on average ( assuming an average sun day of 5.9).
Practically it is not possible to run a refrigerator with a 100-watt solar panel.


We have seen that a 100 watts solar panel can do a lot of things, it can run small home appliances like Ceiling fans, Lamps, lighting, Laptops among others.
We answered some common questions about the 100 watts solar panels, if you still have some questions please ask them in the comment section below and we will answer them.

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