Injection Molding Machine Energy Upgrade Payback Calculator

Compare verified baseline and proposed molding SEC values to estimate annual electricity savings and simple payback.

Formula and method

Annual energy saved = (baseline SEC − proposed SEC) × annual comparable mass. Net annual saving = energy saved × rate − added maintenance cost. Payback = installed premium / net annual saving.

Inputs and units

Use like-for-like measured SEC values, annual mass that can actually transfer to the proposed equipment, the applicable electricity rate, installed premium, and annual maintenance difference.

Worked example

A baseline of 1.2 versus 0.7 kWh/kg across 500,000 kg/year saves 250,000 kWh/year. At 0.12 per kWh with 5,000 added annual cost and a 100,000 premium, payback is 4 years.

When to use it

Use after technical machine/mold compatibility and comparable energy measurements are available.

How to interpret the result

Treat energy as one investment line. Cycle time, quality, labor, cooling, maintenance, financing, incentives, demand charges, and residual value need separate review.

Assumptions and limitations

Do not compare EUROMAP 60.1 efficiency classes across dissimilar machine sizes. Vendor estimates and generic machine-type factors are not substitutes for a comparable product-related measurement.

Validation guidance

Run the same product and process boundary where possible, document uncertainties, and sensitivity-test annual mass, tariff, maintenance, and verified SEC.

FAQ

Can this result replace a measured production trial?

No. Preserve the meter, time window, product quality, machine, mold, material, process, and boundary with the result.

Sources

EUROMAP 60.2 product-related energy method · EUROMAP 60.1 machine energy and idle method