Vending Machine Energy Use – How to Check It

How to check a vending machine's energy use: manufacturer data, measurement, energy-saving settings, and placement.

The office electricity bill went up, and someone at a meeting voices a suspicion: it must be that vending machine in the hallway, it glows and hums around the clock. Maybe so, maybe not. A vending machine does run nonstop, but how much energy it uses depends on many things, from the type of machine to where it stands. This article explains how to check a vending machine's energy use, where to find the data, what affects it, and how to reduce it without harming the machine's operation. We don't give figures or model comparisons. We'll show you how to get reliable information yourself.

Why a machine uses energy around the clock

Most vending machines run nonstop. A refrigerated machine has to keep the interior cold even when nobody is buying anything. A hot drinks machine heats water so it's ready the moment someone orders. On top of that come the lighting, the display, the payment module, and the control electronics. Each of these draws power, though to different degrees and at different times. Cooling or heating usually accounts for the largest share of consumption, not the lighting, even though the lighting is the most visible.

The rating plate is the starting point

The first place to look for information is the machine's rating plate. It lists the rated power, voltage, and other electrical specs. Keep in mind, though, that the power on the plate is usually a maximum value, not average consumption. The heater or compressor runs in cycles, not at full power the whole time. So multiplying the plate's power by the hours in a day gives an inflated result. The plate tells you how much the machine can draw at a given moment, not how much it actually uses over a day.

The manufacturer's documentation

The manufacturer's documentation often contains more information. The manual or spec sheet may list declared energy consumption under specific conditions, such as a given ambient temperature. That's a better reference point than the plate's power. But check the conditions the manufacturer measured under, because real consumption depends on where the machine stands and how it's used. If you don't have the documentation on hand, ask the supplier or the vending operator for it.

Measuring with a plug-in meter

The simplest way to find out real consumption is to measure it. A plug-in energy meter placed between the outlet and the plug shows how much energy the machine used over a given period. Measure over several days, ideally covering both workdays and a weekend, because consumption changes with traffic and time of day. Before connecting the meter, check that it's rated for a device with the machine's power. If the machine has a different plug or is hardwired, an electrician should do the measurement.

Submeters and building management systems

In some buildings, vending machines are on a separate circuit with a submeter. Then you can read the consumption directly. Buildings with energy management systems can also show consumption by circuit. Ask the building manager whether data like that is available. It's especially useful when several machines stand in the building and you need to work out how to split electricity costs between the operator and the site. How that split works depends on the agreement, and it's worth discussing the accounting side with an accountant.

Remote data from the machine

Newer machines often have telemetry systems that send the operator information about how the machine is running. Some also show data on temperature, compressor or heater cycles, and sometimes energy use. Ask the operator what data they collect and whether they can share it. Even without a direct energy reading, information on how often the compressor runs can point to a problem, such as a leaky gasket or a dusty condenser. The details depend on the system and the agreement.

What affects consumption: location

Where the machine stands has a big effect on energy use. A refrigerated machine in a sunny spot, next to a radiator, or in a tight alcove with no airflow has to work harder. Warm air blown out by the condenser comes right back into the machine if it has nowhere to go. The manufacturer usually states in the manual how much clearance to leave around the machine. Follow it. Moving the machine a foot or two from the wall or away from a window can change more than any setting in the menu.

What affects consumption: condition

A machine in poor condition uses more energy. A dusty condenser struggles to shed heat. A leaky door gasket lets warm air in. Scale in a coffee machine's heater makes heating take longer. Worn fans run less efficiently. Regular maintenance as the manufacturer's manual describes is one of the simplest ways to keep consumption reasonable. If consumption suddenly goes up, check these components before looking for other causes.

What affects consumption: settings

Many machines let you change settings that affect energy use. The cooling temperature, lighting duration, night mode, or an energy-saving mode during quiet hours are typical examples. Some coffee machines lower the water temperature at night and heat it back up before the day starts. Be careful, though. The cooling temperature has to suit the products stored inside and can't be raised just to save money. The product manufacturer sets the temperature requirements. Agree on any setting changes with the operator.

Lighting and the display

The machine's lighting is the most visible part, so it's often the first target. Newer machines usually use LED lighting, which draws less power than older options. Many machines also let you set a lighting schedule or dimming when nobody is nearby. Keep in mind, though, that a well-lit machine sells better and looks like it's working. In places where people come at night too, turning off the lights can make the machine look broken.

Night modes and schedules

If the machine stands in an office that's empty at night and on weekends, an energy-saving mode can make sense. The machine then reduces activity, for example by dimming the lights or limiting heating. Check how quickly it returns to full readiness, though. If the first person in the morning waits several minutes for coffee, they'll complain. At sites that run around the clock, such as hospitals or multi-shift plants, a night mode may not be appropriate. Match the schedule to the hours the machine is actually used.

A coffee machine and readiness

A hot drinks machine has a different consumption profile from a refrigerated one. The heater, which keeps water ready and heats it for each drink, draws most of the energy. At peak times, the heater runs often; in the quiet of the night, rarely, but it still holds the temperature. If the machine also has a milk cooling module, add its consumption. Scale in the heater makes heating take longer, so regular descaling and water filter changes matter for the electricity bill too. Some machines let you set a lower standby temperature during quiet hours. Then check how long it takes to get back to full temperature and whether the first drinks in the morning come out lukewarm. The manufacturer's manual or the operator will tell you which settings are available and safe for the machine.

How to work out the cost

Once you have a measurement, you can work out the energy cost. Just multiply the measured consumption by the energy price in your electricity contract. Keep in mind that the price may depend on the tariff and time of day, so check it on the invoice or in the contract. Scale a few days' measurement up to a month or a year, but with caution, because consumption changes with the seasons. In summer, a refrigerated machine usually works harder than in winter, especially in an unair-conditioned hallway. Ideally, repeat the measurement in different months. A result like that is more reliable than any estimate from the internet.

Talking to the operator

If the machine belongs to an operator, they know it best. Ask about declared consumption, available energy-saving settings, and the service history. The operator may also know whether newer models in their fleet would work better at that spot. Come to the conversation with a measurement, not a general hunch that the machine uses too much. Concrete data makes it easier to look for solutions together and to judge whether the changes worked.

Replacing it with a newer model

Older machines often use more energy than newer ones, because they have less efficient compressors, weaker insulation, and older lighting. Replacing one with a newer model can cut consumption, but it doesn't always pay off. Compare the cost of replacement with the savings over the long term, and consider other factors, such as reliability and features. Compare the new model's declared consumption with a measurement of the old one taken under the same conditions. Make the decision together with the operator, who knows both machines.

Example: a machine in an office hallway

An office building's management suspects that a drinks machine uses a lot of electricity. An electrician connects an energy meter for a week. It turns out consumption is higher than the manufacturer declares. The operator inspects the machine and finds a dusty condenser and a gasket that doesn't seal in one corner. The machine also stands right next to a radiator. After the condenser is cleaned, the gasket replaced, and the machine moved a few yards away, the measurement is repeated for another week. Consumption drops, and the machine runs more quietly.

Common mistakes

A few mistakes come up again and again when assessing a machine's energy use. The first is calculating consumption from the plate's power, which gives an inflated result. The second is measuring for just one day, which doesn't capture differences between days. The third is raising the cooling temperature to save money without checking the products' requirements. The fourth is placing the machine next to a heat source or without airflow. The fifth is neglecting maintenance. Each of these leads to the wrong conclusions or needlessly high bills.

What to check

If you want to find out a machine's energy use, check:

• What power does the rating plate list, and what does the manufacturer's documentation say?
• Can you measure consumption with a plug-in meter or read it from a submeter?
• Does the machine stand away from heat sources with clearance around it?
• Is the condenser clean, and does the gasket seal?
• What energy-saving settings does the machine have, and are they on?
• Does the schedule match the hours the machine is used?
• What data can the operator share?

The rating plate and the manufacturer's documentation list the electrical specs for your specific machine.

Related reading: Powering a Vending Machine.

FAQ

How much electricity does a vending machine use? It depends on the type of machine, its location, and its settings. It's best to check the manufacturer's documentation and measure consumption in practice.

Is the power on the rating plate the real consumption? No. It's usually a maximum value, and the machine runs in cycles, so average consumption is lower.

Can I raise the cooling temperature to save energy? Only within the requirements of the products stored inside. Agree on changes with the operator.

Should the machine be switched off at night? Usually not, especially refrigerated machines. It's better to use an energy-saving mode if the machine has one.