ElectraKit
Low-voltage systems

Access Control Power Supply Calculator

Sum access control controller, lock, and accessory loads for standby and simultaneous activation scenarios.

Access control power

Enter system loads

V DC
A
locks
A
A
locks
A
%
A

Power supply load estimate

Entered rating is below estimated demand Capacity margin: -0.13 A.
Peak demand with headroom
3.13 A
Standby current1.1 A
Simultaneous peak current2.5 A
Entered supply rating3 A
Estimate onlyCompare loads at the selected voltage and operating mode. Check supply derating, battery charging, lock inrush, controller and accessory output limits, voltage drop, and manufacturer instructions separately. This does not evaluate life-safety release logic.

About this calculator

Estimate controller, lock, and accessory current at a shared 12 V or 24 V DC system voltage. The tool separates standby demand from an entered simultaneous lock-activation scenario.

Use manufacturer current data for each device and confirm that all listed loads use the entered voltage.

Method and assumptions

Standby current adds controller, all locks at standby, and accessories. Peak current adds controller and accessories, locks at active current for the entered simultaneous count, and remaining locks at standby current. Design headroom is applied to peak current before comparing with the entered supply output rating.

Voltage drop, inrush duration, battery charging, output-by-output limits, and manufacturer derating are not modeled.

FAQs

How should I choose simultaneous active locks?

Use the credible maximum activation scenario for the system design, based on the access-control sequence and project requirements.

Does a passing current total confirm the power supply is suitable?

No. Verify output ratings at the selected voltage, inrush, charging load, derating, branch outputs, and manufacturer limits.

Sources

Use nameplate and manufacturer documentation for access controllers, locks, accessories, and the selected power supply.