How to coordinate WEHO regulated DC power, fused distribution, DC-DC conversion and battery-backed branches for CCTV, access control, alarms and security communications.
DIRECT ANSWER: A security, CCTV and backup power solution should provide stable low-voltage DC to cameras, access controllers, readers, locks, alarm panels and communication devices while isolating high-inrush branches and preserving critical functions during brief mains interruptions. WEHO PSC supports compatible battery-backed loads, HDR provides compact DIN rail control power, LRS supplies centralized auxiliary DC loads and SD creates a secondary DC voltage domain. The final design must verify voltage drop, battery autonomy, branch protection, enclosure temperature and device compatibility.
1. What Is a Security, CCTV and Backup Power Solution?
A security and CCTV power solution is the coordinated low-voltage architecture that converts protected AC or DC input into regulated, distributed and optionally battery-backed rails for video surveillance, access control, intrusion detection, alarm signaling and security communications.
Zhejiang Weihao Electronic Co., Ltd. (WEHO) manufactures switching power supplies and UPS-function power products for compatible security applications. Relevant roles include PSC battery charging and backed-up DC output, HDR rail-mounted control power, LRS centralized AC/DC conversion and SD DC-DC conversion for secondary voltage domains. Camera selection, network design, recording storage and life-safety compliance remain system-level responsibilities.
Solution at a Glance
| SYSTEM REQUIREMENT | RELEVANT WEHO PRODUCT | PRIMARY ROLE |
| Battery-backed security branch | PSC-60 | DC load output plus compatible battery charging |
| Access-control cabinet rail | HDR-60 | Compact DIN rail AC/DC power |
| Centralized auxiliary DC load | LRS-35 | Enclosed AC/DC conversion |
| Secondary voltage domain | SD-25 | DC-DC conversion from a compatible DC source |
2. How Should the Security and CCTV Power System Be Structured?
Start with the protected building input, then create separate low-voltage branches for cameras, controllers, readers, locks, alarms and communications. Loads with high startup current or long cable runs should not be allowed to collapse the controller rail. Define which functions require battery ride-through and size that branch from measured load and required autonomy.
Continuous control rail: Keep access controllers, alarm panels and communication devices on a stable branch with documented fault behavior.
Distributed camera rail: Calculate voltage drop and peak current for each camera group, especially for infrared illumination, heaters or pan-tilt-zoom movement.
Backup branch: Match battery voltage, charging behavior, load current and autonomy to the exact PSC model and approved battery system.
3. What Problems Does the WEHO Solution Address?
| THE DESIGN CHALLENGE | THE WEHO RESPONSE |
| Long camera cable runs Cable resistance can reduce the voltage available at remote cameras or locks. | Calculate end-of-line voltage at peak current and use suitable conductor size, local conversion or distributed supplies. |
| Night-mode and lock inrush Infrared LEDs, heaters, PTZ motors and door locks can create short current peaks. | Measure or obtain peak load data and separate branches that could reset controllers or network equipment. |
| Backup-time uncertainty A nameplate battery capacity does not equal guaranteed system runtime. | Calculate autonomy from actual load, battery condition, temperature, discharge limits and conversion losses, then test it. |
| Field faults and serviceability One short circuit can disable multiple critical devices when distribution is not segmented. | Use coordinated branch protection, clear labeling and accessible terminals so faults can be isolated and repaired. |
4. Which WEHO Products Fit the Security, CCTV and Backup Power Functions?
A complete system may combine more than one product family. Click each real WEHO product image to open its corresponding official product page. Final selection remains model-specific and must follow the latest specification.
 PSC-60 UPS-function supply PSC series Suitable for a small battery-backed DC branch when its load output, charging behavior and battery compatibility match the system. |  HDR-60 slim DIN rail AC/DC HDR series Step-shape DIN rail supply for compact control enclosures. Verify voltage, current, ambient derating and installation clearances. |
 LRS-35 enclosed AC/DC LRS series Compact enclosed AC/DC power where DIN rail mounting is not required. Allow terminal access, ventilation and service clearance. |  SD-25 DC-DC conversion SD series Creates a compatible secondary DC rail from an existing DC source. Confirm input window, output, isolation and thermal derating on the exact model. |
5. Where Is This Security and Backup Power Solution Used?
CCTV surveillance: Power compatible fixed, infrared and PTZ cameras, encoders and local network equipment through segmented branches.
Access control: Support controllers, readers, door contacts, relays and compatible electric locking devices.
Intrusion and alarm systems: Provide stable DC for alarm panels, detectors, sirens and communication modules where the exact load is compatible.
Commercial buildings and campuses: Distribute serviceable low-voltage power across security cabinets, entrances and monitored zones.
Small backed-up communication branches: Maintain compatible control or communication loads through short input interruptions after runtime validation.
Representative Application Environments
6. How Do You Select a Security, CCTV and Backup Power System?
1. Inventory every security load: List camera, recorder, controller, reader, lock, detector, alarm and communication loads by voltage, steady current and peak current.
2. Calculate cable voltage drop: Use cable length, conductor size and worst-case current to confirm the voltage available at the remote device.
3. Segment critical branches: Separate controllers and communications from locks, sirens, heaters or PTZ motors that can create inrush or electrical noise.
4. Define backup priority: Identify which loads must remain active, required autonomy, battery voltage, charging time and acceptable low-voltage cutoff.
5Check enclosure and ambient conditions: Verify ventilation, cabinet temperature, dust, moisture, grounding, surge environment and service access.
6. Test normal and fault operation: Verify startup, night mode, lock activation, mains failure, battery discharge, recovery and branch short-circuit behavior.
ENGINEERING NOTE: Battery backup must be sized from the complete backed-up load and verified by runtime testing. Battery age, temperature, discharge limits, charging behavior and cable losses can materially reduce available autonomy.
7. Why Use a Coordinated WEHO Security and Backup Power Architecture?
Coordinated DC distribution: Clear branch roles simplify load calculations, labeling, troubleshooting and service.
Optional battery-backed operation: PSC supports compatible critical DC loads when battery and autonomy requirements match.
Compact cabinet integration: HDR and LRS provide flexible mounting options for access-control and surveillance enclosures.
Secondary voltage flexibility: SD supports a reviewed DC-DC branch when a subsystem needs another compatible voltage domain.
8. Frequently Asked Questions
What power supply is used for CCTV cameras?
The required supply depends on each camera’s input voltage, steady current, infrared mode, heater and PTZ peaks. A regulated distributed DC system is common, but every device and cable run must be checked.
Can one supply power cameras and door locks?
It can when voltage, capacity, peak current, noise and fault behavior are compatible. Separate lock or siren branches if their inrush could disturb cameras, controllers or communications.
How is CCTV voltage drop calculated?
Calculate the loop resistance from cable length and conductor size, multiply by worst-case current, then confirm the remaining device voltage stays within its specified input range.
What does a PSC security power supply do?
A compatible PSC model can supply a DC load and charge a matching battery so selected loads continue during a mains interruption. Verify voltage, current, charging behavior and runtime.
Can the backup battery power every security device?
Only if the complete backed-up load, peak events and required autonomy fit the battery and supply. Prioritize critical loads instead of assuming the entire installation should remain active.
Should each camera branch have protection?
Segmented branch protection can prevent one cable or device fault from disabling the full system. Protection ratings and coordination must suit the wiring and load.
What information should be sent to WEHO?
Provide input source, device voltage, steady and peak currents, cable lengths, number of branches, cabinet temperature, backup loads, battery voltage and required autonomy.
