How Much Solar Power You Need to Make that Cup of Coffee

Coffee is the world’s favorite drink. It has been for centuries, and it will be for many more to come. There are many different ways of brewing coffee and each has different power consumption and with some not requiring any electricity at all.  

A typical solar generator size is about 250Wh with an Inverter capable of delivering 2000 watts enough to power most coffee makers .  This means that you can plug into the Coffee Maker and use it for a long time. Solar panels can also be added to charge it by plugging it into an outlet that is on the wall or an auto socket.

We’ve put together this guide on how much solar power would be needed to brew coffee so that you can figure out what kind of system suits your needs best.

How much Power does a Coffee Maker Need

There are many different types of coffee makers on the market, but all work in more or less the same way. The most common one in our homes is the drip coffee maker. They are called ‘drip’ because the water flows through the grounds under the action of gravity, and the brewed coffee drips down into a carafe or pot.

So how do they work? They typically consist of a water reservoir, a filter, and a heating element. When electricity is supplied to the heating element, the water boils and turns into steam, which then flows over the coffee grounds in the filter. The resulting liquid contains caffeine and flavors from any flavoring that was added before brewing. 

The downside to drip coffee makers is that they use a lot of power to produce the amount of coffee most households will drink in a day. The heating element takes up space, and there are more components which mean more material is needed during production.

A drip coffee maker is rated at around 1500 watts which is a lot. But you will only need to use the coffee maker for anywhere between five to seven minutes to brew 6 cups of coffee from a duo coffee maker. 

However, you should be aware that if you don’t turn it off a coffee maker continues to use power to maintain the temperature of the water. This is at least 60 watts of power an hour. 

What is the quantity of energy required to run the Coffee Maker?

The energy required to power electrical appliances is measured by Watt-Hours. In order to calculate the Watt-Hours, calculate your power consumption of a device or appliance and then multiply that number by the time that you’re using the appliance.

Hours of Watts equals Watts X Hours

For instance, if you intend to use your Coffee Maker for four minutes, then:

 = 1500 Watts (5/60) hours

This comes to 125 Wh 

Therefore, you’ll need 125 Watts hours to make 6 cups of coffee. Now let’s add another two hours to keep the water warm. 

= 60 Watts  x 2 hours

120 Watt Hours 

So you will actually end up doubling energy use just to keep the coffee warm. So its advisable to shut off the coffee maker and keep your coffee warm in a thermos and save energy. 

How much solar power would I require for a Coffee Maker

Based on our scenario instance that we’ve studied it will take around 125 Wh to power the Coffee Maker for 5 minutes. To figure out the number of batteries you’ll require to power the coffee maker you’ll need to convert Watt-hours to Amp-hours. This is how the majority of batteries are rated. Amp-hours is equal to the power of 1 amp that is used in an hour.

In order to calculate the Amp-hours, you must divide the Watt-hours of this equation with the value of the voltage. A bank’s voltage typically is in the range of 12V up to 24V depending on how you connect the system.

125Wh/12v = 10.41 Ah

Therefore, a battery that has 10.41 Ah or more will run on the coffee maker for 6 minutes max. To ensure that the battery has enough reserve capacity, it’s advised to boost the capacity of the battery by at least three times its size. This is why the most effective suggestion is to use an average battery size of 30Ah (Technically not three times but this is what you’ll get in the market). 

This rating applies only to lithium batteries that have 90 percent of their discharge. If you’re using an acid lead battery that can be discharged up to 50 percent, then you’ll have to boost the capacity by 60 Ah.

Sizing the Inverter for the Coffee Maker

Inverters convert DC electricity to AC power. Its main function is to increase the battery’s voltage to match that of the wall outlet in your home. This could be 220V or 110V.

When selecting an inverter you’ll have to determine the power output of the device with the inverter. It’s also important to be aware of the surge watts created by the gadget i.e the energy required to get the device started. It could exceed the running power of the device by a significant amount.

If you are looking for a Coffee Maker with 1500 watts, you can choose an inverter that has at least 2000 watts and higher since it does not require power surges. Inverters with exactly 1500 watts are not a viable option because inverters have a power factor of about 0.8 so an inverter with a power factor of 0.8 can only generate 1200 watts which won’t power the coffee maker.

How many solar panels are required for the Coffee Maker?

The size of solar panels is contingent on the location and also altitude as well as the distance from the Equator. If you’re in an area that receives about 4 hours of sunlight every day, you’ll need to divide the total number of Watt-hours you require by this number.

125Wh/4 = 31 Watts

However, even a 31-watt solar panel is not enough to operate your Coffee Maker. Solar panels are inefficient. So you’ll require at least twice the wattage of the solar panel in order to create the amps needed for the recharge of the battery that powers the Coffee Maker.

To power your Coffee Maker for 4 minutes, you’ll need a minimum of 50 Watts of Solar Panel. This will be sufficient to fully recharge an 80 Ah 12V battery within approximately five hours. The good news is that you can plug in other devices in the system. 

Make sure to charge the controller.

A charge controller regulates the amount of power supplied from your solar panels and prevents overcharging of the battery. An amplifier of 20 amps to charge will provide security for this type of system.

How much Solar Power for a Single-Serve Keurig 

A Single pod coffee maker is a coffee maker that does not use a traditional pot. Instead, it uses individual pods of grounds, water, and filters that are inserted one at a time into the machine. These machines are usually used in homes or in campers where people don’t need to brew more than one cup at a time, but they can also be found in some offices that have high coffee consumption.

Single Pods will require less energy to produce one cup of coffee as the heating element is smaller and the brewing process is less. 

Single Pod Wattage1500 Watts
Watt-Hours (2 minutes)45 Wh
Battery-Amp Hours8 Ah
Solar Panel60 Watts

How much Solar Power for an Espresso Machine 

An automatic espresso machine forces boiling water under pressure through ground coffee beans. It’s good for people who simply don’t have the time or patience to grind the coffee, brew it and clean up after themselves. This is a great machine for providing cafe-quality drinks fast without all the mess. 

An automatic espresso machine is around 1050 watts you can get a semi-automatic espresso machine for a lower wattage. 

Automatic Espresso Machine1050 Watts
Watt-Hours (5 minutes)87.5 Wh
Battery-Amp Hours8 Ah
Solar Panel60 Watts


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