CCTV DVR Storage Calculator
Estimate CCTV DVR/NVR storage by camera count, bitrate, recording hours, retention, and RAID factor.
Open Tool
ELV Tools
CCTV, UPS, rack power, access control, and intruder alarm battery planning tools.
Data Rack Power & UPS Calculator
Estimate rack load, UPS kVA, heat output, and battery energy requirement.
Open Tool
Access Control Door Hardware Planner
Build controller, reader, lock, REX, contact, PSU, and battery quantities.
Open Tool
Intruder Alarm Battery Calculator
Calculate intruder alarm battery size from standby load, alarm load, siren duration, derating, and spare.
Open ToolAbout these ELV tools
Use these tools for practical planning, checking, and early-stage engineering support. Each tool includes sample data, calculation results, interpretation, warnings, assumptions, confidence notes, and branded print output.
How to use this page
ELV tools cover low-current systems such as CCTV storage, data rack UPS planning, and access control door hardware. These calculators help estimate capacity, quantities, power, and storage before detailed vendor coordination. Final values should still be checked against device datasheets, network architecture, retention policy, and client security requirements.
Use these outputs as early planning numbers for coordination, budgeting, and review meetings before final vendor design.
ELV planning checks
ELV work often fails when storage, power, battery backup, rack load, and device quantities are treated too late. Use the CCTV storage calculator to compare camera count, bitrate, retention days, recording hours, RAID allowance, and spare capacity. Use the rack UPS calculator to estimate IT load, UPS kVA, heat output, battery energy, and runtime assumptions before final equipment selection.
Before vendor finalization
Use the access control planner to convert door counts into controllers, readers, locks, REX devices, contacts, power supply current, and backup battery capacity. Then confirm the result with device datasheets, network topology, client retention policy, cybersecurity requirements, cable routes, voltage drop, enclosure space, and the approved security system brand.