How to Calculate the Electrical Load for a Coffee Shop

Coffee Business Resource Center

An equipment list becomes much more useful when it shows what each appliance needs from the building. That is how you find out whether the espresso machine, brewer, refrigeration, and water heater can work together before installation day.

You can prepare the operating information and an initial load worksheet yourself. The final service and circuit calculations belong with the electrician designing the installation. Your worksheet helps them work from the café you actually plan to run.

Start with every appliance that uses power

Walk through opening, service, cleaning, and closing. Record the espresso machine, every grinder, batch brewer, hot-water dispenser, refrigerators, freezers, ice machine, dishwasher or glasswasher, water heaters, pumps, point-of-sale equipment, lighting, and any cooking equipment.

Also identify building loads such as heating, cooling, ventilation, and outdoor equipment. They may be outside the coffee-equipment supplier's scope but still matter to the site's electrical capacity.

For each item, collect the exact model, voltage, phase, frequency, input rating, manufacturer's circuit requirements, connection, and expected location. Mark unresolved equipment choices clearly. A line that says “refrigerator, details pending” is more honest and useful than an invented wattage.

Use electrical input information. A motor's output power or a heater's individual element rating may not describe the whole appliance. When the documentation is unclear, ask the manufacturer rather than filling in a convenient number.

Build a first-pass worksheet

Here is an illustrative equipment list, using invented input values solely to show the process. It is not a specification for a real café or a circuit-sizing recommendation.

The arithmetic is straightforward: add the listed input watts and divide by 1,000 to express kilowatts. The interpretation takes more care. This table leaves out building services and may leave out several appliances your menu requires. It also does not account for every starting condition, circuit requirement, or rule the electrician must apply.

Do not add amps from unlike supplies

An amp reading belongs with its voltage and supply arrangement. Adding a 120V appliance's amps to a 240V appliance's amps does not give a meaningful single service-current requirement.

For a single-phase load, volts multiplied by amps gives apparent power in volt-amperes, or VA. Real power in watts also depends on power factor. Eaton explains this distinction as watts being VA multiplied by power factor. That is why a hypothetical 120V appliance drawing 5A represents 600VA, but you should not automatically label it a 600W load without the relevant information. Eaton: VA versus watts

Keep the manufacturer's units in the worksheet. If one appliance lists amps, another watts, and another a required circuit, provide those values as stated and let the electrician reconcile them. Do not replace missing information with a guess that makes the spreadsheet look complete.

Likewise, the sum of all breaker handles in a panel is not the calculated demand on the service. Breaker ratings and actual appliance demand describe different things.

Separate connected load from what happens during service

Connected load describes the equipment you have listed. Operating demand depends on what runs together and how it runs. A café's opening sequence can be quite different from its midmorning routine.

At opening, the espresso machine and brewer may both be heating from cold. During service, a refrigerator starts automatically while the water heater recovers and a barista uses the grinder. During closing, a dishwasher or other cleaning equipment may add demand even after drink production slows.

Describe those scenarios to the electrician. Do not simply assume that thermostats will prevent appliances from operating at the same time. Their cycles can overlap. Motors can also have starting requirements that are different from their running demand.

A planned opening sequence may help operations, but it does not erase the installation requirements. Nor should a power plan depend on turning off refrigeration or disabling required hot water during a rush.

Keep equipment ratings and circuit requirements separate

Manufacturer installation instructions can specify a circuit requirement in addition to the appliance's power rating. Record both.

For example, La Marzocco's U.S. Strada S/X guide lists its two-group configuration at 5,666W with a required 30A circuit, while the three-group configuration is listed at 7,783W with a required 50A circuit. These are model-specific instructions, not a conversion table for other machines. La Marzocco installation guide

Your electrician also has to assess the site, applicable requirements, conductor routing, protection, panel capacity, and the supply arrangement. A general-purpose online wattage calculator cannot settle those questions for the project.

Put future equipment on a separate line

If you expect to add a second grinder, larger brewer, ice machine, or cooking appliance, show it as a future option with its anticipated location. Do not quietly mix an unknown future load into the current total.

Ask what it would cost to provide sensible capacity or pathways during construction, and what could reasonably wait. This gives you a concrete comparison between today's installation expense and the disruption of reopening walls or counters later.

For a cart, keep a separate schedule for each approved operating setup. Venue power and generator power may have different limits. The load sheet should show which appliances that particular setup can support and the documented conditions for doing so.

Use a different calculation for electricity cost

A load worksheet helps with power planning. An energy estimate helps with operating cost. They are related but not interchangeable.

For a simple example, a 1.5kW load operating at that power for two total hours uses 3kWh. An appliance switched on for an eight-hour day may spend only part of that time drawing its full rated power. Your utility's billing structure can introduce other charges as well.

Once the shop is operating, compare actual usage with the assumptions. Have qualified personnel investigate unexplained demand or electrical problems; do not open panels or improvise measurements around wet coffee equipment.

Keep the final appliance schedule with your installation records. When someone wants to add a brewer “in that empty outlet,” you will have a useful starting point for checking the change.